Search

Your search keyword '"J. Marganiec"' showing total 291 results
Start Over Author "J. Marganiec"
291 results on '"J. Marganiec"'

1. Corrigendum: 'Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis' [Phys. Lett. B 790 (2019) 458–465]

Author

C. Lederer-Woods, U. Battino, P. Ferreira, A. Gawlik, C. Guerrero, F. Gunsing, S. Heinitz, J. Lerendegui-Marco, A. Mengoni, R. Reifarth, A. Tattersall, S. Valenta, C. Weiss, O. Aberle, J. Andrzejewski, L. Audouin, V. Bécares, M. Bacak, J. Balibrea, M. Barbagallo, S. Barros, F. Bečvář, C. Beinrucker, F. Belloni, E. Berthoumieux, J. Billowes, D. Bosnar, M. Brugger, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, F. Cerutti, E. Chiaveri, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, L. Cosentino, L.A. Damone, K. Deo, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, R.J.W. Frost, V. Furman, K. Göbel, A.R. García, I. Gheorghe, T. Glodariu, I.F. Gonçalves, E. González-Romero, A. Goverdovski, E. Griesmayer, H. Harada, T. Heftrich, A. Hernández-Prieto, J. Heyse, D.G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, T. Katabuchi, P. Kavrigin, V. Ketlerov, V. Khryachkov, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, E. Leal-Cidoncha, H. Leeb, M. Licata, S. Lo Meo, R. Losito, D. Macina, J. Marganiec, T. Martínez, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. Mendoza, P.M. Milazzo, F. Mingrone, M. Mirea, S. Montesano, A. Musumarra, R. Nolte, F.R. Palomo-Pinto, C. Paradela, N. Patronis, A. Pavlik, J. Perkowski, J.I. Porras, J. Praena, J.M. Quesada, T. Rauscher, A. Riego-Perez, M. Robles, C. Rubbia, J.A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Sedyshev, A.G. Smith, A. Stamatopoulos, S.V. Suryanarayana, G. Tagliente, J.L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, M. Weigand, T. Wright, and P. Žugec

Subjects
Physics, QC1-999
Published
2023
Full Text
View/download PDF

2. Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions

Author

C. Lehr, F. Wamers, F. Aksouh, Yu. Aksyutina, H. Álvarez-Pol, L. Atar, T. Aumann, S. Beceiro-Novo, C.A. Bertulani, K. Boretzky, M.J.G. Borge, C. Caesar, M. Chartier, A. Chatillon, L.V. Chulkov, D. Cortina-Gil, P. Díaz Fernández, H. Emling, O. Ershova, L.M. Fraile, H.O.U. Fynbo, D. Galaviz, H. Geissel, M. Heil, M. Heine, D.H.H. Hoffmann, M. Holl, H.T. Johansson, B. Jonson, C. Karagiannis, O.A. Kiselev, J.V. Kratz, R. Kulessa, N. Kurz, C. Langer, M. Lantz, T. Le Bleis, R. Lemmon, Yu.A. Litvinov, B. Löher, K. Mahata, J. Marganiec-Galązka, C. Müntz, T. Nilsson, C. Nociforo, W. Ott, V. Panin, S. Paschalis, A. Perea, R. Plag, R. Reifarth, A. Richter, K. Riisager, C. Rodriguez-Tajes, D. Rossi, D. Savran, H. Scheit, G. Schrieder, P. Schrock, H. Simon, J. Stroth, K. Sümmerer, O. Tengblad, H. Weick, and C. Wimmer

Subjects
Physics, QC1-999
Abstract

The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p,2p)16F→15⁎O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including γ decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l=0 and l=2 motion of the valence protons in 17Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the 15O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.

Published
2022
Full Text
View/download PDF

3. Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis

Author

C. Lederer-Woods, U. Battino, P. Ferreira, A. Gawlik, C. Guerrero, F. Gunsing, S. Heinitz, J. Lerendegui-Marco, A. Mengoni, R. Reifarth, A. Tattersall, S. Valenta, C. Weiss, O. Aberle, J. Andrzejewski, L. Audouin, V. Bécares, M. Bacak, J. Balibrea, M. Barbagallo, S. Barros, F. Bečvář, C. Beinrucker, F. Belloni, E. Berthoumieux, J. Billowes, D. Bosnar, M. Brugger, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, F. Cerutti, E. Chiaveri, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, L. Cosentino, L.A. Damone, K. Deo, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, R.J.W. Frost, V. Furman, K. Göbel, A.R. García, I. Gheorghe, T. Glodariu, I.F. Gonçalves, E. González-Romero, A. Goverdovski, E. Griesmayer, H. Harada, T. Heftrich, A. Hernández-Prieto, J. Heyse, D.G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, T. Katabuchi, P. Kavrigin, V. Ketlerov, V. Khryachkov, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, E. Leal-Cidoncha, H. Leeb, M. Licata, S. Lo Meo, R. Losito, D. Macina, J. Marganiec, T. Martínez, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. Mendoza, P.M. Milazzo, F. Mingrone, M. Mirea, S. Montesano, A. Musumarra, R. Nolte, F.R. Palomo-Pinto, C. Paradela, N. Patronis, A. Pavlik, J. Perkowski, J.I. Porras, J. Praena, J.M. Quesada, T. Rauscher, A. Riego-Perez, M. Robles, C. Rubbia, J.A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Sedyshev, A.G. Smith, A. Stamatopoulos, S.V. Suryanarayana, G. Tagliente, J.L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, M. Weigand, T. Wright, and P. Žugec

Subjects
Physics, QC1-999
Abstract

73Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at kT=30 keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system. Keywords: Nucleosynthesis, Neutron capture, s process, Germanium, n_TOF

Published
2019
Full Text
View/download PDF

4. Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Author

I. Syndikus, M. Petri, A.O. Macchiavelli, S. Paschalis, C.A. Bertulani, T. Aumann, H. Alvarez-Pol, L. Atar, S. Beceiro-Novo, J. Benlliure, J.M. Boillos, K. Boretzky, M.J.G. Borge, B.A. Brown, M. Caamaño, C. Caesar, E. Casarejos, W. Catford, J. Cederkall, S. Chakraborty, L.V. Chulkov, D. Cortina-Gil, E. Cravo, R. Crespo, U. Datta Pramanik, I. Dillmann, P. Díaz Fernández, Z. Elekes, J. Enders, F. Farinon, L.M. Fraile, D. Galaviz, H. Geissel, R. Gernhäuser, P. Golubev, K. Göbel, M. Heil, M. Heine, A. Heinz, A. Henriques, M. Holl, H.T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, T. Kröll, N. Kurz, C. Langer, T. Le Bleis, J. Machado, J. Marganiec-Gałązka, E. Nacher, T. Nilsson, C. Nociforo, V. Panin, A. Perea, S.B. Pietri, R. Plag, A. Rahaman, R. Reifarth, A. Revel, G. Ribeiro, C. Rigollet, D.M. Rossi, D. Savran, H. Scheit, H. Simon, O. Sorlin, O. Tengblad, Y. Togano, M. Vandebrouck, V. Volkov, F. Wamers, C. Wheldon, G.L. Wilson, J.S. Winfield, H. Weick, P. Woods, D. Yakorev, M. Zhukov, A. Zilges, and K. Zuber

Subjects
Quasi-free scattering reactions, Magic numbers, Spin-orbit splitting, Tensor force, Shell evolution, Exotic nuclei, Physics, QC1-999
Abstract

The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 21+ state of 16,18,20C. The experimental findings support the notion of a moderate reduction of the proton 1p1/2−1p3/2 spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline.

Published
2020
Full Text
View/download PDF

5. Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n)25Mg

Author

C. Massimi, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Bécares, F. Bečvář, F. Belloni, E. Berthoumieux, J. Billowes, S. Bisterzo, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, D.M. Castelluccio, F. Cerutti, E. Chiaveri, L. Cosentino, M. Chin, G. Clai, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, S. Cristallo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, C. Eleftheriadis, A. Ferrari, P. Finocchiaro, K. Fraval, S. Ganesan, A.R. García, G. Giubrone, I.F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, A. Hernández-Prieto, D.G. Jenkins, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimos, N. Kivel, P. Koehler, M. Kokkoris, S. Kopecky, M. Krtička, J. Kroll, C. Lampoudis, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L.S. Leong, S. Lo Meo, R. Losito, A. Mallick, A. Manousos, J. Marganiec, T. Martínez, P.F. Mastinu, M. Mastromarco, E. Mendoza, A. Mengoni, P.M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaers, A. Musumarra, C. Paradela, A. Pavlik, J. Perkowski, M. Pignatari, L. Piersanti, A. Plompen, J. Praena, J.M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M.S. Robles, C. Rubbia, M. Sabaté-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J.L. Tain, D. Tarrío, L. Tassan-Got, A. Tsinganis, S. Valenta, G. Vannini, I. Van Rijs, V. Variale, P. Vaz, A. Ventura, M.J. Vermeulen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Weiß, R. Wynants, T. Wright, and P. Žugec

Subjects
s Process, α+22Ne, Neutron spectroscopy, Physics, QC1-999
Abstract

This work reports on accurate, high-resolution measurements of the 25Mg(n,γ)26Mg and 25Mg(n,tot) cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved 25Mg(n,γ)26Mg parametrization. The relevant resonances for n+25Mg were characterized from a combined R-matrix analysis of the experimental data. This resulted in an unambiguous spin/parity assignment of the corresponding excited states in 26Mg. With this information experimental upper limits of the reaction rates for 22Ne(α,n)25Mg and 22Ne(α,γ)26Mg were established, potentially leading to a significantly higher (α,n)/(α,γ) ratio than previously evaluated. The impact of these results has been studied for stellar models in the mass range 2 to 25 M⊙.

Published
2017
Full Text
View/download PDF

6. Coulomb and nuclear excitations of narrow resonances in 17Ne

Author

J. Marganiec, F. Wamers, F. Aksouh, Yu. Aksyutina, H. Álvarez-Pol, T. Aumann, S. Beceiro-Novo, C.A. Bertulani, K. Boretzky, M.J.G. Borge, M. Chartier, A. Chatillon, L.V. Chulkov, D. Cortina-Gil, H. Emling, O. Ershova, L.M. Fraile, H.O.U. Fynbo, D. Galaviz, H. Geissel, M. Heil, D.H.H. Hoffmann, J. Hoffmann, H.T. Johansson, B. Jonson, C. Karagiannis, O.A. Kiselev, J.V. Kratz, R. Kulessa, N. Kurz, C. Langer, M. Lantz, T. Le Bleis, R. Lemmon, Yu.A. Litvinov, K. Mahata, C. Müntz, T. Nilsson, C. Nociforo, G. Nyman, W. Ott, V. Panin, S. Paschalis, A. Perea, R. Plag, R. Reifarth, A. Richter, C. Rodriguez-Tajes, D. Rossi, K. Riisager, D. Savran, G. Schrieder, H. Simon, J. Stroth, K. Sümmerer, O. Tengblad, S. Typel, H. Weick, M. Wiescher, and C. Wimmer

Subjects
Physics, QC1-999
Abstract

New experimental data for dissociation of relativistic 17Ne projectiles incident on targets of lead, carbon, and polyethylene targets at GSI are presented. Special attention is paid to the excitation and decay of narrow resonant states in 17Ne. Distributions of internal energy in the O15+p+p three-body system have been determined together with angular and partial-energy correlations between the decay products in different energy regions. The analysis was done using existing experimental data on 17Ne and its mirror nucleus 17N. The isobaric multiplet mass equation is used for assignment of observed resonances and their spins and parities. A combination of data from the heavy and light targets yielded cross sections and transition probabilities for the Coulomb excitations of the narrow resonant states. The resulting transition probabilities provide information relevant for a better understanding of the 17Ne structure.

Published
2016
Full Text
View/download PDF

8. High accuracy, high resolution $^{235}$U(n,f) cross section from n_TOF (CERN) from 18 meV to 10 keV

Author

M. Mastromarco, S. Amaducci, N. Colonna, P. Finocchiaro, L. Cosentino, M. Barbagallo, O. Aberle, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, F. Bečvář, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, G. Cortés, M. A. Cortés-Giraldo, L. A. Damone, M. Diakaki, C. Domingo-Pardo, D. Diacono, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, V. Furman, K. Göbel, A. R. García, A. Gawlik, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, D. Kurtulgil, E. Leal-Cidoncha, C. Lederer, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martínez, A. Masi, C. Massimi, P. Mastinu, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I. Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, R. Reifarth, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, P. Sedyshev, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, P. Žugec, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mastromarco, M, Amaducci, S, Colonna, N, Finocchiaro, P, Cosentino, L, Barbagallo, M, Aberle, O, Andrzejewski, J, Audouin, L, Bacak, M, Balibrea, J, Becvar, F, Berthoumieux, E, Billowes, J, Bosnar, D, Brown, A, Caamano, M, Calvino, F, Calviani, M, Cano-Ott, D, Cardella, R, Casanovas, A, Cerutti, F, Chen, YH, Chiaveri, E, Cortes, G, Cortes-Giraldo, MA, Damone, LA, Diakaki, M, Domingo-Pardo, C, Diacono, D, Dressler, R, Dupont, E, Duran, I, Fernandez-Dominguez, B, Ferrari, A, Ferreira, P, Furman, V, Gobel, K, Garcia, AR, Gawlik, A, Gilardoni, S, Glodariu, T, Goncalves, IF, Gonzalez-Romero, E, Griesmayer, E, Guerrero, C, Gunsing, F, Harada, H, Heinitz, S, Heyse, J, Jenkins, DG, Jericha, E, Kappeler, F, Kadi, Y, Kalamara, A, Kavrigin, P, Kimura, A, Kivel, N, Knapova, I, Kokkoris, M, Krticka, M, Kurtulgil, D, Leal-Cidoncha, E, Lederer, C, Leeb, H, Lerendegui-Marco, J, LoMeo, S, Lonsdale, SJ, Macina, D, Manna, A, Marganiec, J, Martinez, T, Masi, A, Massimi, C, Mastinu, P, Maugeri, EA, Mazzone, A, Mendoza, E, Mengoni, A, Milazzo, PM, Mingrone, F, Musumarra, A, Negret, A, Nolte, R, Oprea, A, Patronis, N, Pavlik, A, Perkowski, J, Porras, I, Praena, J, Quesada, JM, Radeck, D, Rauscher, T, Reifarth, R, Rubbia, C, Ryan, JA, Sabate-Gilarte, M, Saxena, A, Schillebeeckx, P, Schumann, D, Sedyshev, P, Smith, AG, Sosnin, NV, Stamatopoulos, A, Tagliente, G, Tain, JL, Tarifeno-Saldivia, A, Tassan-Got, L, Valenta, S, Vannini, G, Variale, V, Vaz, P, Ventura, A, Vlachoudis, V, Vlastou, R, Wallner, A, Warren, S, Weiss, C, Woods, PJ, Wright, T, Zugec, P, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and n_TOF

Subjects
Neutrons, Nuclear and High Energy Physics, Fission, Energies [Àrees temàtiques de la UPC], Nuclear physics, 235U, fission, cross section, n_TOF, CERN, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Espectroscòpia de ressonància magnètica nuclear, Resonance, n_TOF, cross section, 235U, CERN, Física nuclear, Nuclear Physics - Experiment, Nuclear Experiment, Nuclear magnetic resonance spectroscopy, Neutron energy
Abstract

The 235U(n,f) cross section was measured in a wide energy range (18 meV–170 keV) at the n_TOF facility at CERN, relative to 6Li(n,t) and 10B(n,α) standard reactions, with high resolution and accuracy, with a setup based on a stack of six samples and six silicon detectors placed in the neutron beam. In this paper we report on the results in the region between 18 meV and 10 keV neutron energy. A resonance analysis has been performed up to 200 eV, with the code SAMMY. The resulting fission kernels are compared with the ones extracted on the basis of the resonance parameters of the most recent major evaluated data libraries.Acomparison of the n_TOF datawith the evaluated cross sections is also performed from thermal to 10 keV neutron energy for the energy-averaged cross section in energy groups of suitably chosen width. A good agreement, within 0.5%, is found on average between the new results and the latest evaluated data files ENDF/B-VIII.0 and JEFF-3.3, as well as with respect to the broad group average fission cross section established in the framework of the standard working group of IAEA (the so-called reference file). However, some discrepancies, of up to 4%, are still present in some specific energy regions. The newdataset here presented, characterized by a unique combination of high resolution and accuracy, low background and wide energy range, can help to improve the evaluations from the Resolved Resonance Region up to 10 keV, also reducing the uncertainties that affect this region., CERN (European Organization for Nuclear Research)

Published
2022

9. Update of the BIPM comparison BIPM.RI(II)-K1.Cs-134 of activity measurements of the radionuclide 134Cs to include the 2014 result of the POLATOM (Poland), the 2014 result of the NRC (Canada), the 2015 result of the LNMRI-IRD (Brazil) and the 2016 result of the PTB (Germany)

Author

C Michotte, S Courte, R Coulon, M Nonis, S Judge, G Ratel, C J da Silva, R Galea, K Moore, T Dziel, A Muklanowicz, J Marganiec-Gałązka, O Nähle, and K Kossert

Subjects
General Engineering
Abstract

Main text Since 1976, 23 laboratories have submitted 44 samples of 134Cs to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Cs-134. In the last few years, the POLATOM (Poland), the NRC (Canada), the LNMRI-IRD (Brazil) and the PTB (Germany) participated in the comparison and the key comparison reference value (KCRV) has been updated. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the APMP.RI(II)-K2.Cs-134 comparison and the updated KCRV have been calculated and the results are given in the form of a table. A graphical representation is also given. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Published
2023

10. The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF

Author

M. Dietz, C. Lederer-Woods, A. Tattersall, U. Battino, F. Gunsing, S. Heinitz, J. Lerendegui-Marco, M. Krtička, R. Reifarth, S. Valenta, O. Aberle, S. Amaducci, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, M. Barbagallo, F. Bečvář, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, P. Finocchiaro, K. Göbel, A. R. García, A. Gawlik-Ramie˛ga, S. Gilardoni, T. Glodariu†, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, H. Harada, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler†, Y. Kadi, D. Kahl, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, M. Kokkoris, D. Kurtulgil, E. Leal-Cidoncha, H. Leeb, S. Lo Meo, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I. Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, and P. Žugec

Subjects
General Medicine
Abstract

The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The 72Ge(n, γ) Maxwellian-Averaged Cross Section (MACS) has an important influence on the production of isotopes between Ge and Zr in the weak s-process in massive stars and so far only theoretical estimations are available. An experiment was carried out at the neutron time-of-flight facility n_TOF at CERN to measure the 72Ge(n, γ) reaction for the first time at stellar neutron energies. The capture measurement was performed using an enriched 72GeO2 sample at a flight path length of 184 m, which provided high neutron energy resolution. The prompt gamma rays produced after neutron capture were detected with a set of liquid scintillation detectors (C6D6). The neutron capture yield is derived from the counting spectra taking into account the neutron flux and the gamma-ray detection efficiency using the Pulse Height Weighting Technique. Over 70 new neutron resonances were identified, providing an improved resolved reaction cross section to calculate experimental MACS values for the first time. The experiment, data analysis and the new MACS results will be presented including their impact on stellar nucleosynthesis, which was investigated using the post-processing nucleosynthesis code mppnp for a 25 solar mass model.

Published
2023

11. Neutron capture cross sections of light neutron-rich nuclei relevant for r-process nucleosynthesis

Author

M. Heine, Th. Kröll, S. Chakraborty, Rene Reifarth, Stefan Typel, P. Díaz Fernández, D. M. Rossi, Ushasi Datta, Marielle Chartier, Ralf Plag, J. Marganiec, A. Bhattacharyya, Catherine Rigollet, Christoph Langer, V. Panin, M. V. Ricciardi, C. Nociforo, P. Das, R. Krücken, Yvonne Leifels, S. Beceiro-Novo, Herbert A. Simon, Anisur Rahaman, C. Caesar, H. Geissel, J. S. Winfield, Andreas Wagner, Nasser Kalantar-Nayestanaki, Björn Jonson, H. Emling, T. Le Bleis, W. N. Catford, Thomas Aumann, D. Cortina-Gil, Stefanos Paschalis, Yasuhiro Togano, G. Münzenberg, Yutaka Utsuno, C. Scheidenberger, Helmut Weick, Håkan T Johansson, H. Scheit, D. González-Díaz, J. Kurcewicz, K. Boretzky, G. De. Angelis, B. V. Carlson, Thomas Nilsson, F. Wamers, Nuclear Energy, Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Neutron capture, 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, r-process nucleosynthesis, Dissociation (chemistry), Nuclear physics, Reaction rate, Nucleosynthesis, neutron-rich nuclei, 0103 physical sciences, Neutron cross section, r-process, Neutron, Hauser-Feshbach, 010306 general physics, Ground state, Nuclear Experiment
Abstract

International audience; The measurements of neutron capture cross sections of neutron-rich nuclei are challenging but essential for understanding nucleosynthesis and stellar evolution processes in the explosive burning scenario. In the quest of r-process abundances, according to the neutrino-driven-wind model, light neutron-rich unstable nuclei may play a significant role as seed nuclei that influence the abundance pattern. Hence, experimental data for neutron capture cross sections of neutron-rich nuclei are needed. Coulomb dissociation of radioactive ion beams at intermediate energy is a powerful indirect method for inferring capture cross section. As a test case for validation of the indirect method, the neutron capture cross section (n, γ) for C14 was inferred from the Coulomb dissociation of C15 at intermediate energy (600A MeV). A comparison between different theoretical approaches and experimental results for the reaction is discussed. We report for the first time experimental reaction cross sections of Na28(n,γ)Na29, Na29(n,γ)Na30, Mg32(n,γ)Mg33, and Al34(n,γ)Al35. The reaction cross sections were inferred indirectly through Coulomb dissociation of Na29,30, Mg33, and Al35 at incident projectile energies around 400–430 A MeV using the FRS-LAND setup at GSI, Darmstadt. The neutron capture cross sections were obtained from the photoabsorption cross sections with the aid of the detailed balance theorem. The reaction rates for the neutron-rich Na, Mg, Al nuclei at typical r-process temperatures were obtained from the measured (n,γ) capture cross sections. The measured neutron capture reaction rates of the neutron-rich nuclei, Na28, Na29, and Al34 are significantly lower than those predicted by the Hauser-Feshbach decay model. A similar trend was observed earlier for C17 and N19 but in the case of C14(n,γ)C15 the trend is opposite. The situation is more complicated when the ground state has a multi-particle-hole configuration. For Mg32, the measured cross section is about 40–90% higher than the Hauser-Feshbach prediction.

Published
2021

12. Destruction of the cosmic γ -ray emitter Al26 in massive stars: Study of the key Al26(n,α) reaction

Author

M. Caamaño, A. Gawlik, Thomas Rauscher, M. Bacak, T. Davinson, A. Pavlik, C. Domingo-Pardo, E. González-Romero, M. Sabaté-Gilarte, T. Glodariu, M. Mastromarco, D. Cano-Ott, G. Cortes, G. Tagliente, M. Diakaki, Alexandru Negret, C. Weiss, B. Fernández-Domínguez, F. Käppeler, Javier Praena, S. Lo Meo, A. R. García, S. Heinitz, Rugard Dressler, Massimo Barbagallo, A. Oprea, D. Bosnar, Emilio Andrea Maugeri, A. Kimura, A. Casanovas, N. Colonna, M. Kokkoris, J. Marganiec, N. V. Sosnin, M. A. Cortés-Giraldo, Anton Wallner, Rene Reifarth, J. Andrzejewski, A. Mengoni, I. Duran, L. Cosentino, A. Musumarra, Y. H. Chen, J. Balibrea, P. Vaz, A. Manna, Annamaria Mazzone, Petar Žugec, P. J. Woods, Vasilis Vlachoudis, N. Patronis, D. Macina, Carlos Guerrero, A. K. Saxena, A. Stamatopoulos, Arnaud Ferrari, F. Cerutti, J. Billowes, F. J. Ferrer, P. Kavrigin, Ralf Nolte, Hideo Harada, J. M. Quesada, Simone Gilardoni, E. Griesmayer, L. A. Damone, A. Masi, D. G. Jenkins, L. Tassan-Got, R. Cardella, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. Krtička, S. Warren, J. Lerendegui-Marco, V. Variale, S. Amaducci, Sergio Cristallo, Claudia Lederer-Woods, T. Martinez, Y. Kadi, E. Dupont, I. F. Gonçalves, Kathrin Göbel, Deniz Kurtulgil, P. V. Sedyshev, A. Ventura, S. Valenta, Marco Calviani, R. Vlastou, D. Radeck, A. G. Smith, E. Chiaveri, Ignacio Porras, E. Berthoumieux, P. F. Mastinu, Jan Heyse, A. Kalamara, V. Furman, T. J. Wright, C. Paradela, J. L. Tain, L. Audouin, Niko Kivel, O. Aberle, F. Calviño, H. Leeb, J. Perkowski, Pedro G. Ferreira, F. Gunsing, Cristian Massimi, C. Rubbia, E. Jericha, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, A. S. Brown, P. M. Milazzo, F. Bečvář, E. Mendoza, Peter Schillebeeckx, A. Estrade, F. Mingrone, D. Kahl, G. Vannini, and E. Leal-Cidoncha

Subjects
Physics, Stars, COSMIC cancer database, 010308 nuclear & particles physics, European research, 0103 physical sciences, Key (cryptography), Astronomy, Cost action, 010303 astronomy & astrophysics, 01 natural sciences
Abstract

We thank P. Black (University of Edinburgh) for support in design and construction of the detection system and P. Morrall (Daresbury Laboratory) for production of the B and LiF reference samples. This Letter was supported by the Austrian Science Fund (FWF), Project No. J3503, by JRCIRMM through the EUFRAT Program, by the U.K. Science and Technologies Facilities Council (STFC), Projects No. ST/L005824/1 and No. ST/M006085/1, the European Research Council ERC-2015-STG Grant No. 677497, and the Cost Action "ChETEC" (Grant No. CA16117).

Published
2021

13. Measurement of the 72Ge(n,γ) cross section over a wide neutron energy range at the CERN n_TOF facility

Author

Javier Praena, S. Lo Meo, J. Lerendegui-Marco, S. Amaducci, F. Mingrone, A. Kalamara, I. F. Gonçalves, Simone Gilardoni, N. Colonna, R. Cardella, S. Heinitz, A. Stamatopoulos, F. Cerutti, R. Vlastou, D. Radeck, D. Cano-Ott, M. Diakaki, O. Aberle, E. Berthoumieux, U. Battino, A. Pavlik, G. Tagliente, S. Valenta, G. Vannini, C. Domingo-Pardo, Ignacio Porras, Y. H. Chen, Marco Calviani, S. Warren, M. Sabaté-Gilarte, M. Caamaño, A. Ventura, A. G. Smith, F. Bečvář, D. Macina, Carlos Guerrero, N. V. Sosnin, A. Oprea, V. Variale, A. S. Brown, E. Mendoza, Annamaria Mazzone, Petar Žugec, J. Marganiec, Philip Woods, N. Patronis, Rene Reifarth, A. K. Saxena, G. Cortes, L. Audouin, Peter Schillebeeckx, Arnaud Ferrari, M. Bacak, D. Bosnar, P. M. Milazzo, Alexandru Negret, J. Billowes, Cortés-Giraldo, J. M. Quesada, L. Tassan-Got, Pedro G. Ferreira, A. Casanovas, B. Fernández-Domínguez, M. Krtička, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Käppeler, T. Glodariu, V. Furman, T. J. Wright, D. Kahl, J. L. Tain, Hideo Harada, Emilio Andrea Maugeri, M. Mastromarco, T. Martinez, Niko Kivel, M. Kokkoris, Kathrin Göbel, Claudia Lederer-Woods, J. Andrzejewski, I. Duran, Rugard Dressler, Y. Kadi, Massimo Barbagallo, E. Jericha, L. Cosentino, Anton Wallner, Paolo Finocchiaro, E. Chiaveri, C. Rubbia, P. F. Mastinu, Dorothea Schumann, J. Balibrea, J. A. Ryan, Jan Heyse, Vasilis Vlachoudis, Deniz Kurtulgil, P. V. Sedyshev, F. Calviño, H. Leeb, J. Perkowski, F. Gunsing, Cristian Massimi, A. Masi, D. G. Jenkins, A. Manna, A. Tattersall, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, C. Weiss, A. Musumarra, A. Mengoni, M. Dietz, A. R. García, A. Kimura, E. Leal-Cidoncha, E. Dupont, A. Gawlik, Thomas Rauscher, E. González-Romero, and P. Vaz

Subjects
Physics, Large Hadron Collider, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Liquid scintillation counting, 7. Clean energy, 01 natural sciences, Resonance (particle physics), Neutron temperature, Nuclear physics, Cross section (physics), Beamline, 13. Climate action, 0103 physical sciences, Nuclear astrophysics, Neutron, Nuclear Experiment, 010306 general physics
Abstract

The Ge72(n,γ) cross section was measured for neutron energies up to 300keV at the neutron time-of-flight facility n_TOF (CERN), Geneva, for the first time covering energies relevant to heavy-element synthesis in stars. The measurement was performed at the high-resolution beamline EAR-1, using an isotopically enriched GeO272 sample. The prompt capture γ rays were detected with four liquid scintillation detectors, optimized for low neutron sensitivity. We determined resonance capture kernels up to a neutron energy of 43keV, and averaged cross sections from 43 to 300keV. Maxwellian-averaged cross section values were calculated from kT=5 to 100keV, with uncertainties between 3.2% and 7.1%. The new results significantly reduce uncertainties of abundances produced in the slow neutron capture process in massive stars.

Published
2021

14. Measurement of the α ratio and (n,γ) cross section of U235 from 0.2 to 200 eV at n_TOF

Author

M. B. Gomez-Hornillos, J. Andrzejewski, C. Carrapiço, M. A. Cortés-Giraldo, G. Cortes, Tanja Heftrich, A. Riego-Perez, D. Tarrío, V. Bécares, C. Weiss, Roberto Capote, M. Mirea, Srinivasan Ganesan, Kathrin Göbel, A. Mallick, G. Vannini, E. Jericha, Rene Reifarth, F. Mingrone, Rugard Dressler, Jan Heyse, M. Mastromarco, Dorothea Schumann, G. Tagliente, C. Lederer, S. Altstadt, V. Variale, J. A. Ryan, E. Chiaveri, A. Tsinganis, P. F. Mastinu, A. K. Saxena, P. Vaz, Stefan Schmidt, Jeri Kroll, F. Calviño, Massimo Barbagallo, Petar Žugec, L.S. Leong, F. Bečvář, H. Leeb, Anton Wallner, Arnaud Ferrari, Vasilis Vlachoudis, J. Balibrea-Correa, M. S. Robles, E. Mendoza, N. Colonna, Peter Schillebeeckx, J. Billowes, J. Perkowski, R. Sarmento, C. Lampoudis, A. Pavlik, V. Khryachkov, P. M. Milazzo, C. Domingo-Pardo, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, P. E. Koehler, Willy Mondelaers, P. V. Sedyshev, D. G. Jenkins, M. Sabaté-Gilarte, D. Cano-Ott, M. Diakaki, C. Paradela, Roberto Losito, L. Audouin, Christoph Langer, K. Fraval, M. Kokkoris, M. Krtička, A. Manousos, A. Goverdovski, Mario Weigand, T. Martinez, D. Bosnar, J. Marganiec, A. Hernández-Prieto, T. Ware, R. Vlastou, E. Berthoumieux, E. Griesmayer, Carlos Guerrero, G. Giubrone, F. Gunsing, Cristian Massimi, V. Furman, T. J. Wright, Tatsuya Katabuchi, A. Ventura, A. Mengoni, M. P. W. Chin, I. Duran, V. Ketlerov, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, J. L. Tain, D. Karadimos, Ariel Tarifeño-Saldivia, J. Lerendegui-Marco, Niko Kivel, A. R. García, M. Brugger, C. Rubbia, I. F. Gonçalves, Fabio Belloni, Javier Praena, F. Cerutti, M. J. Vermeulen, Y. Kadi, S. Valenta, Marco Calviani, E. González, F. Käppeler, and A. J. M. Plompen

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, Fission, 01 natural sciences, Calorimeter, Nuclear physics, Cross section (physics), Neutron capture, Neutron flux, Nuclear fission, 0103 physical sciences, Neutron, 010306 general physics
Abstract

We measured the neutron capture-to-fission cross-section ratio (α ratio) and the capture cross section of $^{235}$U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF$_{2}$ Total Absorption Calorimeter (TAC), used for detection of γ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the $^{6}$Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the $^{235}$U(n,f) cross section between 7.8 and 11 eV was then used for its absolute normalization. The α ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of $^{235}$U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV.

Published
2020

15. Neutron Capture on the s -Process Branching Point Tm171 via Time-of-Flight and Activation

Author

Claudia Lederer-Woods, A Kriesel, L. Piersanti, P. V. Sedyshev, Javier Praena, S. Lo Meo, J. Heyse, G. Vannini, B. Fernández-Domínguez, D. M. Castelluccio, F. Käppeler, D. Macina, Carlos Guerrero, D. Bosnar, M A Millán-Callado, F. Mingrone, J. Andrzejewski, J. Lerendegui-Marco, S. Amaducci, O. Aberle, M. Caamaño, E. Leal-Cidoncha, I. Duran, I. F. Gonçalves, D Berkovits, F. Cerutti, A. Gawlik, A. Goverdovski, G. Tagliente, Thomas Rauscher, V. Bécares, T Rodríguez-González, A Damone, Emilio Andrea Maugeri, G. Cortes, Leonid Weissman, S. Montesano, Michael Paul, K. Rajeev, A. Stamatopoulos, M. Kokkoris, S. Warren, R. Vlastou, E. Jericha, Paolo Finocchiaro, E. Berthoumieux, Francesca Matteucci, T Palchan-Hazan, A. Casanovas, S. Halfon, D. Cano-Ott, M. Diakaki, Ulli Köster, E. González-Romero, P. Kavrigin, D Kijel, V. Variale, Dimitri Rochman, A. Musumarra, Dorothea Schumann, J. A. Ryan, M. Tessler, Ariel Tarifeño-Saldivia, S. J. Lonsdale, A. Manna, P. Vaz, Ralf Nolte, E. Griesmayer, Ignacio Porras, P. J. Woods, L. Cosentino, A. Oprea, Tanja Heftrich, R. Cardella, C. Weiss, T Hirsh, A. R. García, mtext, M. Brugger, A Shor, Alberto Ventura, mrow, E. Dupont, P. C. Rout, Y. Kadi, N. Patronis, A. K. Saxena, V. Khryachkov, P. M. Milazzo, Arnaud Ferrari, C. Beinrucker, A. Pavlik, V. Furman, A. Mengoni, S. Valenta, C. Domingo-Pardo, T. J. Wright, B Kaizer, J. Billowes, Marco Calviani, F. Bečvář, V. Ketlerov, C. Wolf, A. G. Smith, Petar Žugec, E. Mendoza, M. Dietz, Peter Schillebeeckx, H Dafna, S. Heinitz, L. Audouin, Y Eisen, M. Bacak, C. Rubbia, Y Buzaglo, T. Glodariu, Roberto Losito, Rugard Dressler, mtext> Tof, M. Sabaté-Gilarte, A. Tsinganis, Nicola Colonna, M. A. Cortés-Giraldo, Vasilis Vlachoudis, Kathrin Göbel, A. Kimura, D. G. Jenkins, Mario Barbagallo, J. L. Tain, J. Marganiec, Niko Kivel, E. Chiaveri, P. F. Mastinu, M. Krtička, T. Martinez, Y. H. Chen, F. Gunsing, Cristian Massimi, M. Mirea, Rene Reifarth, Stefan Schmidt, F. Calviño, H. Leeb, J. M. Quesada, J. Perkowski, L. Tassan-Got, Sergio Cristallo, Pedro G. Ferreira, Mario Weigand, Tatsuya Katabuchi, A Barak, S. Barros, M. Mastromarco, Anton Wallner, J. Balibrea, and Hideo Harada

Subjects
Physics, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Neutron capture, Stellar nucleosynthesis, Nucleosynthesis, 0103 physical sciences, Neutron cross section, Neutron, Nuclide, 010306 general physics, s-process
Abstract

The neutron capture cross sections of several unstable nuclides acting as branching points in the s process are crucial for stellar nucleosynthesis studies. The unstable $^{171}$Tm(t$_{1/2}$=1.92 yr) is part of the branching around mass A∼170 but its neutron capture cross section as a function of the neutron energy is not known to date. In this work, following the production for the first time of more than 5 mg of $^{171}$Tm at the high-flux reactor Institut Laue-Langevin in France, a sample was produced at the Paul Scherrer Institute in Switzerland. Two complementary experiments were carried out at the neutron time-of-flight facility (n_TOF) at CERN in Switzerland and at the SARAF liquid lithium target facility at Soreq Nuclear Research Center in Israel by time of flight and activation, respectively. The result of the time-of-flight experiment consists of the first ever set of resonance parameters and the corresponding average resonance parameters, allowing us to make an estimation of the Maxwellian-averaged cross sections (MACS) by extrapolation. The activation measurement provides a direct and more precise measurement of the MACS at 30 keV: 384(40) mb, with which the estimation from the n_TOF data agree at the limit of 1 standard deviation. This value is 2.6 times lower than the JEFF-3.3 and ENDF/B-VIII evaluations, 25% lower than that of the Bao et al. compilation, and 1.6 times larger than the value recommended in the KADoNiS (v1) database, based on the only previous experiment. Our result affects the nucleosynthesis at the A∼170 branching, namely, the $^{171}$Yb abundance increases in the material lost by asymptotic giant branch stars, providing a better match to the available pre-solar SiC grain measurements compared to the calculations based on the current JEFF-3.3 model-based evaluation.

Published
2020

16. Study of the neutron-induced fission cross section of Np-237 at CERN's n_TOF facility over a wide energy range

Author

E. Leal-Cidoncha, Simone Gilardoni, S. Valenta, E. Dupont, A. Gawlik, Marco Calviani, Thomas Rauscher, R. Cardella, A. Pavlik, Rene Reifarth, A. Musumarra, A. G. Smith, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, G. Vannini, C. Domingo-Pardo, J. M. Quesada, A. Oprea, M. Sabaté-Gilarte, E. González-Romero, M. Caamaño, L. Tassan-Got, Y. H. Chen, J. Lerendegui-Marco, A. Kimura, Javier Praena, S. Lo Meo, Z. Eleme, Y. Kadi, R. Vlastou, D. Radeck, E. Berthoumieux, V. Furman, T. J. Wright, L. Cosentino, A. R. García, G. Cortes, I. F. Gonçalves, J. Andrzejewski, I. Knapova, M. A. Cortés-Giraldo, P. J. Woods, J. Marganiec, P. Vaz, Alberto Ventura, E. Chiaveri, Mario Barbagallo, P. F. Mastinu, A. Mengoni, Pedro G. Ferreira, F. Cerutti, C. Weiss, A. Kalamara, A. S. Brown, N. Patronis, A. K. Saxena, A. Manna, Hideo Harada, M. Mastromarco, D. Bosnar, Rugard Dressler, Arnaud Ferrari, D. Cano-Ott, Anton Wallner, M. Krtička, B. Femandez-Domínguez, M. Diakaki, J. Balibrea, F. Bečvář, Diego Vescovi, F. Gunsing, T. Martinez, A. Masi, P. M. Milazzo, Alexandru Negret, Ariel Tarifeño-Saldivia, S. J. Lonsdale, E. Mendoza, F. Mingrone, A. Tsinganis, C. Lederer, D. G. Jenkins, J. Billowes, F. Käppeler, G. Tagliente, Cristian Massimi, Ignacio Porras, A. Stamatopoulos, Peter Schillebeeckx, Nicola Colonna, O. Aberle, E. Jericha, Vasilis Vlachoudis, Paolo Finocchiaro, A. Casanovas, Dorothea Schumann, J. A. Ryan, S. Warren, C. Rubbia, Emilio Andrea Maugeri, V. Variale, F. Calviño, H. Leeb, M. Kokkoris, J. Perkowski, M. Bacak, L. Audouin, S. Heinitz, P. Kavrigin, Ralf Nolte, E. Griesmayer, T. Glodariu, L. A. Damone, Kathrin Göbel, Jan Heyse, J. L. Tain, Niko Kivel, Durán, Deniz Kurtulgil, P. V. Sedyshev, D. Macina, Carlos Guerrero, Ge, Z., Shu, N., Chen, Y., Wang, W., Zhang, H., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear fuel cycle, Large Hadron Collider, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, MicroMegas detector, n_TOF, 237Np, fission, neutron time of flight, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Neutron temperature, 030218 nuclear medicine & medical imaging, Nuclear physics, 03 medical and health sciences, Cross section (physics), 0302 clinical medicine, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Nuclear Physics - Experiment, Nuclear Experiment
Abstract

This research is implemented through IKY scholarships programme and co-financed by the European Union (European Social Fund - ESF) and Greek national funds through the action entitled Reinforcement of Postdoctoral Researchers, in the framework of the Operational Programme Human Resources Development Program, Education and Lifelong Learning of the National Strategic Reference Framework (NSRF) 2014-2020., Neutron-induced fission cross sections of isotopes involved in the nuclear fuel cycle are vital for the design and safe operation of advanced nuclear systems. Such experimental data can also provide additional constraints for the adjustment of nuclear model parameters used in the evaluation process, resulting in the further development of fission models. In the present work, the Np-237(n,f) cross section was studied at the EAR2 vertical beam-line at CERN's n_TOF facility, over a wide range of neutron energies, from meV to MeV, using the time-of-flight technique and a set-up based on Micromegas detectors, in an attempt to provide accurate experimental data. Preliminary results in the 200 keV - 14 MeV neutron energy range as well as the experimental procedure, including a description of the facility and the data handling and analysis, will be presented., IKY scholarships programme, European Social Fund (ESF) European Commission, Greek national funds through the action entitled Reinforcement of Postdoctoral Researchers

Published
2020

17. Investigation of the Pu240(n,f) reaction at the n_TOF/EAR2 facility in the 9 meV–6 MeV range

Author

R. J. W. Frost, A. Goverdovski, A. Mengoni, M. Krtička, V. Furman, T. J. Wright, I. Duran, G. Tagliente, Petar Žugec, Javier Praena, S. Lo Meo, T. Martinez, L. Cosentino, K. Deo, G. Vannini, V. Ketlerov, D. Bosnar, E. Dupont, A. Musumarra, Tatsuya Katabuchi, A. Ventura, M. Mirea, M. Mastromarco, S. Warren, A. Kimura, S. Heinitz, V. Variale, S. Barros, A. Tsinganis, Massimo Barbagallo, F. R. Palomo-Pinto, M. Caamaño, Rene Reifarth, E. Chiaveri, D. G. Jenkins, Anton Wallner, Stefan Schmidt, C. Paradela, Rugard Dressler, F. Calviño, Tanja Heftrich, P. F. Mastinu, L. Audouin, M. Licata, H. Leeb, J. M. Quesada, L. Tassan-Got, J. Balibrea, S. V. Suryanarayana, F. Mingrone, C. Lederer, I. Knapova, A. Riego-Perez, J. Perkowski, R. Vlastou, J. Marganiec, S. Valenta, Ariel Tarifeño-Saldivia, A. J. M. Plompen, F. Gunsing, P. Vaz, N. Colonna, Marco Calviani, E. Berthoumieux, P. Kavrigin, Ralf Nolte, A. G. Smith, M. A. Cortés-Giraldo, F. Cerutti, Cristian Massimi, A. Pavlik, E. Leal-Cidoncha, O. Aberle, E. Griesmayer, L. A. Damone, C. Domingo-Pardo, Hideo Harada, A. Hernández-Prieto, M. Sabaté-Gilarte, Kathrin Göbel, Vasilis Vlachoudis, V. Bécares, M. S. Robles, Thomas Rauscher, Jan Heyse, M. Kokkoris, C. Rubbia, Pedro G. Ferreira, Mario Weigand, C. Weiss, D. Cano-Ott, Y. Kadi, M. Diakaki, F. Bečvář, M. Bacak, E. Mendoza, Peter Schillebeeckx, J. Lerendegui-Marco, D. Macina, Carlos Guerrero, J. L. Tain, J. I. Porras, T. Glodariu, Roberto Losito, I. F. Gonçalves, Niko Kivel, B. Fernández-Domínguez, E. González-Romero, F. Käppeler, Fabio Belloni, A. R. García, Francesca Matteucci, M. Brugger, C. Beinrucker, V. Khryachkov, P. M. Milazzo, Ioana Gheorghe, N. Patronis, A. K. Saxena, Arnaud Ferrari, S. Montesano, J. Billowes, E. Jericha, A. Stamatopoulos, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, P. V. Sedyshev, J. Andrzejewski, and G. Cortes

Subjects
Physics, Nuclear transmutation, 010308 nuclear & particles physics, Fission, Monte Carlo method, Radioactive waste, MicroMegas detector, 7. Clean energy, 01 natural sciences, Neutron temperature, Spent nuclear fuel, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics
Abstract

Background: Nuclear waste management is considered amongst the major challenges in the field of nuclear energy. A possible means of addressing this issue is waste transmutation in advanced nuclear systems, whose operation requires a fast neutron spectrum. In this regard, the accurate knowledge of neutron-induced reaction cross sections of several (minor) actinide isotopes is essential for design optimization and improvement of safety margins of such systems. One such case is Pu240, due to its accumulation in spent nuclear fuel of thermal reactors and its usage in fast reactor fuel. The measurement of the Pu240(n,f) cross section was previously attempted at the CERN n_TOF facility EAR1 measuring station using the time-of-flight technique. Due to the low amount of available material and the given flux at EAR1, the measurement had to last several months to achieve a sufficient statistical accuracy. This long duration led to detector deterioration due to the prolonged exposure to the high α activity of the fission foils, therefore the measurement could not be successfully completed. Purpose: It is aimed to determine whether it is feasible to study neutron-induced fission at n_TOF/EAR2 and provide data on the Pu240(n,f) reaction in energy regions requested for applications. Methods: The study of the Pu240(n,f) reaction was made at a new experimental area (EAR2) with a shorter flight path which delivered on average 30 times higher flux at fast neutron energies. This enabled the measurement to be performed much faster, thus limiting the exposure of the detectors to the intrinsic activity of the fission foils. The experimental setup was based on microbulk Micromegas detectors and the time-of-flight data were analyzed with an optimized pulse-shape analysis algorithm. Special attention was dedicated to the estimation of the non-negligible counting loss corrections with the development of a new methodology, and other corrections were estimated via Monte Carlo simulations of the experimental setup. Results: This new measurement of the Pu240(n,f) cross section yielded data from 9meV up to 6MeV incident neutron energy and fission resonance kernels were extracted up to 10keV. Conclusions: Neutron-induced fission of high activity samples can be successfully studied at the n_TOF/EAR2 facility at CERN covering a wide range of neutron energies, from thermal to a few MeV.

Published
2020

18. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author

D. Macina, A. Musumarra, K. Göbel, M. Sabaté-Gilarte, E. Mendoza, A. Oprea, I. Knapova, N. V. Sosnin, T. Wright, J. Heyse, Rene Reifarth, N. Kivel, R. Nolte, L. Cosentino, J. Marganiec, P. F. Mastinu, P. Vaz, F. Bečvář, Annamaria Mazzone, Petar Žugec, M. Aiche, I. Duran, Stefan Kopecky, A. Saxena, A. Kimura, Alberto Ventura, G. Vannini, S. Valenta, Nicola Colonna, M. Kokkoris, M. A. Cortés-Giraldo, P. M. Milazzo, R. Dressler, P. Kavrigin, E. Dupont, Carlos Guerrero, G. Sibbens, M. Mastromarco, Marco Calviani, B. Laurent, E. González-Romero, P. Ferreira, Mario Barbagallo, L. Audouin, M. Krtička, A. Pavlik, A. G. Smith, J. Billowes, D. Schumann, E. Griesmayer, Anton Wallner, Alexandru Negret, G. Cortes, C. Domingo-Pardo, G. Tagliente, M. Bacak, L. A. Damone, F. Käppeler, J. Balibrea, Philip Woods, O. Aberle, D. Vanleeuw, F. Mingrone, J. Andrzejewski, F. Calviño, H. Leeb, E. A. Maugeri, A. Kalamara, T. Martinez, C. Weiss, R. Vlastou, Olivier Serot, Carlo Rubbia, V. Vlachoudis, J. Perkowski, M. Diakaki, D. Radeck, Alfredo Ferrari, E. Berthoumieux, Stephan Richter, P. Schillebeeckx, S. Warren, F. Gunsing, A. Masi, Damir Bosnar, Y. Kadi, A. Manna, Hideo Harada, Deniz Kurtulgil, V. Variale, D. G. Jenkins, Y. H. Chen, Cristian Massimi, P. V. Sedyshev, G. Belier, S. Heinitz, V. Furman, A. Stamatopoulos, E. Chiaveri, D. Cano-Ott, A. S. Brown, A. Casanovas, C. Lederer, E. Jericha, T. Glodariu, Paolo Finocchiaro, J. M. Quesada, L. Tassan-Got, A. Moens, J. A. Ryan, S. Amaducci, Simone Gilardoni, R. Cardella, Javier Praena, S. Lo Meo, M. Caamaño, F. Cerutti, B. Fernández-Domínguez, J. L. Tain, J. Taieb, L. Mathieu, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, A. R. García, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, J. Lerendegui-Marco, I. F. Gonçalves, N. Patronis, Alberto Mengoni, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Bacak, M., Aiche, M., Belier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Gunsing, F., Heyse, J., Kopecky, S., Laurent, B., Leeb, H., Mathieu, L., Moens, A., Richter, S., Schillebeeckx, P., Serot, O., Sibbens, G., Taieb, J., Vanleeuw, D., Vlachoudis, V., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Balibrea, J., Barbagallo, M., Becvar, F., Billowes, J., Bosnar, D., Brown, A., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Domingo-Pardo, C., Dressler, R., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Gobel, K., Garcia, A. R., Gawlik, A., Gilardoni, S., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Griesmayer, E., Guerrero, C., Harada, H., Heinitz, S., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J., Macina, D., Manna, A., Marganiec, J., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rauscher, T., Reifarth, R., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schumann, D., Sedyshev, P., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J., Wright, T., Zugec, P., Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak M., Aiche M., Belier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Moens A., Richter S., Schillebeeckx P., Serot O., Sibbens G., Taieb J., Vanleeuw D., Vlachoudis V., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Becvar F., Billowes J., Bosnar D., Brown A., Caamano M., Calvino F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y.H., Chiaveri E., Colonna N., Cortes G., Cortes-Giraldo M.A., Cosentino L., Damone L.A., Domingo-Pardo C., Dressler R., Duran I., Fernandez-Dominguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Gobel K., Garcia A.R., Gawlik A., Gilardoni S., Glodariu T., Goncalves I.F., Gonzalez-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D.G., Jericha E., Kappeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krticka M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.J., Macina D., Manna A., Marganiec J., Martinez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J.M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J.A., Sabate-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A.G., Sosnin N.V., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeno-Saldivia A., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P.J., Wright T., and Zugec P.

Subjects
Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Nuclear Theory, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Context (language use), Neutrons--Captura, 01 natural sciences, 7. Clean energy, Neutrons--Capture, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 233 U, ddc:530, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, [PHYS]Physics [physics], Fission detector, 233U, Time-of-flight, Física [Àrees temàtiques de la UPC], Fissile material, 010308 nuclear & particles physics, Detector, Neutron radiation, Fast fission, NATURAL SCIENCES. Physics, Calorimeter, PRIRODNE ZNANOSTI. Fizika, Neutron capture, 13. Climate action, Física nuclear, Other
Abstract

In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ������) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed., This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT.

Published
2020

19. Measurement of the Pu-242(n,gamma) cross section from thermal to 500 keV at the Budapest research reactor and CERN n_TOF-EAR1 facilities

Author

O. Aberle, G. Cortes, C. Rubbia, Rugard Dressler, V. Khryachkov, P. M. Milazzo, Pedro G. Ferreira, Mario Weigand, A. Oprea, Tamás Belgya, A. Goverdovski, L. Cosentino, E. Jericha, A. Tsinganis, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, L. Audouin, F. Mingrone, K. Rajeev, J. Lerendegui-Marco, J. L. Tain, A. Kimura, D. M. Castelluccio, J. Andrzejewski, Francesca Matteucci, I. Knapova, A. Musumarra, F. Cerutti, Nicola Colonna, M. A. Cortés-Giraldo, T. Martinez, Niko Kivel, I. F. Gonçalves, I. Duran, Mario Barbagallo, F. Gunsing, V. Vlachoudis, G. Vannini, A. R. García, Cristian Massimi, P. Vaz, P. J. Woods, P. C. Rout, M. Caamaño, Tanja Heftrich, C. Weiss, G. Tagliente, C. Lederer, Alberto Ventura, J. Marganiec, A. Riego-Perez, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. Mirea, V. Bécares, M. Brugger, D. Macina, S. Heinitz, Carlos Guerrero, R. Vlastou, D. Cano-Ott, M. Diakaki, Y. Kadi, A. Pavlik, F. Calviño, H. Leeb, B. Fernández-Domínguez, A. Casanovas, F. Käppeler, E. Chiaveri, Javier Praena, S. Lo Meo, N. Patronis, A. K. Saxena, C. Domingo-Pardo, E. Berthoumieux, Diego Vescovi, J. Perkowski, S. Valenta, Arnaud Ferrari, D. G. Jenkins, P. F. Mastinu, F. Bečvář, M. Bacak, Marco Calviani, C. Beinrucker, C. Wolf, P. Kavrigin, Kathrin Göbel, E. Mendoza, Alberto Mengoni, A. G. Smith, Ralf Nolte, J. Billowes, Jan Heyse, E. Leal-Cidoncha, Peter Schillebeeckx, E. Griesmayer, Tatsuya Katabuchi, D. Bosnar, L. A. Damone, M. Krtiička, R. Cardella, Emilio Andrea Maugeri, S. Barros, M. Kokkoris, A. Gawlik, J. I. Porras, Rene Reifarth, T. Glodariu, Thomas Rauscher, S. Warren, Roberto Losito, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, Y. H. Chen, V. Variale, P. V. Sedyshev, Arnd R. Junghans, Petar Žugec, E. González-Romero, V. Ketlerov, V. Furman, Klaus Eberhardt, T. J. Wright, S. Montesano, A. Stamatopoulos, M. Mastromarco, Anton Wallner, J. Balibrea, M. Sabaté-Gilarte, Hideo Harada, E. Dupont, Boglárka Maróti, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ge, Z., Shu, N., Chen, Y., Wang, W., Zhang, H., and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Large Hadron Collider, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, n_TOF, 242Pu, neutron capture, neutron time of flight, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Resonance (particle physics), Nuclear physics, Stack (abstract data type), 0103 physical sciences, Neutron, Research reactor, Nuclear Physics - Experiment, Neutron activation analysis, 010306 general physics
Abstract

The design and operation of innovative nuclear systems requires a better knowledge of the capture and fission cross sections of the Pu isotopes. For the case of capture on 242Pu, a reduction of the uncertainty in the fast region down to 8-12% is required. Moreover, aiming at improving the evaluation of the fast energy range in terms of average parameters, the OECD NEA High Priority Request List (HPRL) requests high-resolution capture measurements with improved accuracy below 2 keV. The current uncertainties also affect the thermal point, where previous experiments deviate from each other by 20%. A fruitful collaboration betwen JGU Mainz and HZ Dresden-Rossendorf within the EC CHANDA project resulted in a 242Pu sample consisting of a stack of seven fission-like targets making a total of 95(4) mg of 242Pu electrodeposited on thin (11.5 μm) aluminum backings. This contribution presents the results of a set of measurements of the 242Pu(n, γ) cross section from thermal to 500 keV combining different neutron beams and techniques. The thermal point was determined at the Budapest Research Reactor by means of Neutron Activation Analysis and Prompt Gamma Analysis, and the resolved (1 eV - 4 keV) and unresolved (1 - 500 keV) resonance regions were measured using a set of four Total Energy detectors at the CERN n_TOF-EAR1. European Commission 334315, 605203 Ministerio de Economía y Competitividad FPA2013-45083-P, FPA2014-53290-C2-2-P, FPA2016-77689-C2-1-R German Federal Ministry for Education and Research (BMBF) 03NUK13A

Published
2020

20. Accurate measurement of the standard 235U(n,f) cross section from thermal to 170 keV neutron energy

Author

A. Pavlik, C. Domingo-Pardo, J. Lerendegui-Marco, Pedro G. Ferreira, S. Amaducci, Emilio Andrea Maugeri, P. Kavrigin, Javier Praena, S. Lo Meo, I. F. Gonçalves, Ralf Nolte, M. Kokkoris, S. Valenta, A. Mengoni, F. Cerutti, D. Bosnar, J. Marganiec, Marco Calviani, E. Griesmayer, Simone Gilardoni, A. G. Smith, F. Mingrone, G. Tagliente, R. Cardella, L. A. Damone, C. Lederer, M. Sabaté-Gilarte, G. Vannini, N. V. Sosnin, Rugard Dressler, J. L. Tain, P. J. Woods, E. Chiaveri, P. F. Mastinu, F. Bečvář, E. Mendoza, C. Weiss, Niko Kivel, A. Kimura, N. Patronis, A. Casanovas, A. K. Saxena, Annamaria Mazzone, Petar Žugec, I. Knapova, A. Masi, O. Aberle, Rene Reifarth, A. R. García, P. Vaz, Arnaud Ferrari, F. Calviño, Nicola Colonna, H. Leeb, Peter Schillebeeckx, M. Caamaño, M. A. Cortés-Girardo, D. Cano-Ott, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Vasilis Vlachoudis, A. Musumarra, D. G. Jenkins, J. Billowes, M. Diakaki, A. Stamatopoulos, Alberto Ventura, J. Perkowski, M. Mastromarco, Kathrin Göbel, L. Cosentino, Ignacio Porras, M. Bacak, Mario Barbagallo, Deniz Kurtulgil, P. V. Sedyshev, M. Krtička, F. Gunsing, A. Manna, J. M. Quesada, L. Tassan-Got, E. Leal-Cidoncha, T. Glodariu, A. Gawlik, Anton Wallner, Thomas Rauscher, Jan Heyse, T. Martinez, A. Oprea, G. Cortes, Cristian Massimi, A. Kalamara, J. Balibrea, E. González-Romero, Y. H. Chen, C. Rubbia, V. Furman, T. J. Wright, Y. Kadi, D. Macina, R. Vlastou, D. Radeck, Carlos Guerrero, E. Berthoumieux, E. Jericha, L. Audouin, Paolo Finocchiaro, Dorothea Schumann, Hideo Harada, Alexandru Negret, J. A. Ryan, B. Fernández-Domínguez, F. Käppeler, A. S. Brown, S. Warren, P. M. Milazzo, V. Variale, S. Heinitz, J. Andrzejewski, I. Duran, E. Dupont, Ge, Z., Shu, N., Chen, Y., Wang, W., Zhang, H., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Large Hadron Collider, Silicon, 010308 nuclear & particles physics, Fission, Physics::Instrumentation and Detectors, QC1-999, Monte Carlo method, Detector, n_TOF, 235U, fission, neutron time of flight, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), chemistry, 0103 physical sciences, Thermal, Nuclear Physics - Experiment, 010306 general physics
Abstract

An accurate measurement of the 235U(n,f) cross section from thermal to 170 keV of neutron energy has recently been performed at n_TOF facility at CERN using 6Li(n,t)4He and 10B(n,α)7Li as references. This measurement has been carried out in order to investigate a possible overestimation of the 235U fission cross section evaluation provided by most recent libraries between 10 and 30 keV. A custom experimental apparatus based on in-beam silicon detectors has been used, and a Monte Carlo simulation in GEANT4 has been employed to characterize the setup and calculate detectors efficiency. The results evidenced the presence of an overestimation in the interval between 9 and 18 keV and the new data may be used to decrease the uncertainty of 235U(n,f) cross section in the keV region.

Published
2020

21. Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Author

A. Henriques, J. S. Winfield, Thomas Nilsson, Rene Reifarth, M. Heine, E. Cravo, L. M. Fraile, Håkan T Johansson, O. Sorlin, L. Chulkov, W. N. Catford, A. Revel, J. Marganiec-Gałązka, Pavel Golubev, H. Scheit, S. Beceiro-Novo, Joakim Cederkäll, R. Gernhäuser, Carlos A. Bertulani, Y. Togano, T. Le Bleis, D. Cortina-Gil, L. Atar, G. L. Wilson, S. Pietri, F. Farinon, Kai Zuber, N. Kurz, Andreas Zilges, V. Volkov, M. Heil, C. Langer, A. Kelic-Heil, R. Plag, Catherine Rigollet, J. Enders, Iris Dillmann, U. Datta Pramanik, Jorge Machado, H. Alvarez-Pol, I. Syndikus, A. O. Macchiavelli, Marina Petri, D. Yakorev, M. Holl, Enrique Casarejos, G. Ribeiro, Mikhail V. Zhukov, Stefanos Paschalis, María José García Borge, Marine Vandebrouck, Deniz Savran, V. Panin, Björn Jonson, Nasser Kalantar-Nayestanaki, Philip Woods, Ángel Perea, C. Wheldon, R. Crespo, Thomas Aumann, Hans Geissel, Z. Elekes, Andreas Martin Heinz, J. M. Boillos, B. A. Brown, D. Galaviz, T. Kröll, S. Chakraborty, K. Göbel, Enrique Nácher, H. Weick, Rituparna Kanungo, P. Díaz Fernández, K. Boretzky, M. Caamaño, Anisur Rahaman, C. Caesar, J. Benlliure, F. Wamers, D. Rossi, Haik Simon, Olof Tengblad, C. Nociforo, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), R$^3$B, Energy and Sustainability Research Institute Groni, Research unit Nuclear & Hadron Physics, Royal Society (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), State of Hesse, Technische Universität Darmstadt, Helmholtz Association, European Young Investigator Awards, Swedish Research Council, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Xunta de Galicia, German Research Foundation, National Science Foundation (US), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, Quasi-free scattering reactions, Field (physics), Proton, Nuclear Theory, Shell (structure), FOS: Physical sciences, Shell evolution, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Atomic, Nuclear physics, Magic number (programming), Particle and Plasma Physics, 0103 physical sciences, Neutron, Nuclear, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Mathematical Physics, Spin-½, Physics, 010308 nuclear & particles physics, Scattering, Molecular, Spin-orbit splitting, Nuclear & Particles Physics, lcsh:QC1-999, 3. Good health, Valley of stability, Tensor force, Magic numbers, Física nuclear, lcsh:Physics, Astronomical and Space Sciences, Exotic nuclei
Abstract

9 pags., 5 figs., 2 tabs., The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 2 state of C. The experimental findings support the notion of a moderate reduction of the proton 1p−1p spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline., This work was supported by the Royal Society award UF150476, UK STFC awards ST/M006433/1 and ST/P003885/1, U.S. Department of Energy, Office of Nuclear Physics, contract No. DE-AC02- 05CH11231 (LBNL), the German Federal Ministry of Education and Research (BMBF projects 05P15RDFN1, 05P15WOFNA and 05P19RDFN1), the GSI-TU Darmstadt cooperation agreement, the State of Hesse through the LOEWE center HIC for FAIR, the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe and Young Investigators Grants, and the Swedish Research Council under contract number 621-2011-5324. This work was also supported by the Spanish research grants (Ministerio Ciencia e Innovación), FPA2015-64969-P, FPA2015-69640-C2-1-P, FPA2017- 87568-P, PGC2018-099746-B-C21, RTI2018-098868-B-I00, Undidad de Excelencia María de Maeztu under project MDM-2016.0692, and the Xunta de Galicia research grant GRC ED431C 2017/54. This work was partly supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245. C.A.B. acknowledges support from the U.S. NSF Grant No. 1415656, and U.S. DOE Grant No. DE-FG02-08ER41533.

Published
2020

22. Preparation and characterization of 33S samples for 33S(n,α)30Si cross-section measurements at the n_TOF facility at CERN

Author

J. Praena, F.J. Ferrer, W. Vollenberg, M. Sabaté-Gilarte, B. Fernández, J. García-López, I. Porras, J.M. Quesada, S. Altstadt, J. Andrzejewski, L. Audouin, V. Bécares, M. Barbagallo, F. Bečvář, F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, F. Calviño, M. Calviani, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, I. Durán, C. Eleftheriadis, A. Ferrari, K. Fraval, V. Furman, K. Göbel, M.B. Gómez-Hornillos, S. Ganesan, A.R. García, G. Giubrone, I.F. Gonçalves, E. González-Romero, A. Goverdovski, E. Griesmayer, C. Guerrero, F. Gunsing, T. Heftrich, A. Hernández-Prieto, J. Heyse, D.G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimos, T. Katabuchi, V. Ketlerov, V. Khryachkov, N. Kivel, P. Koehler, M. Kokkoris, J. Kroll, M. Krtička, C. Lampoudis, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L.S. Leong, J. Lerendegui-Marco, R. Losito, A. Mallick, A. Manousos, J. Marganiec, T. Martínez, C. Massimi, P. Mastinu, M. Mastromarco, E. Mendoza, A. Mengoni, P.M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaers, C. Paradela, A. Pavlik, J. Perkowski, A.J.M. Plompen, T. Rauscher, R. Reifarth, A. Riego-Perez, M. Robles, C. Rubbia, J.A. Ryan, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Sedyshev, G. Tagliente, J.L. Tain, A. Tarifeño-Saldivia, D. Tarrío, L. Tassan-Got, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, M.J. Vermeulen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Weiss, T. Wright, and P. Žugec

Subjects
Physics, Nuclear and High Energy Physics, Thin layers, 010308 nuclear & particles physics, Analytical chemistry, chemistry.chemical_element, Rutherford backscattering spectrometry, 7. Clean energy, 01 natural sciences, Copper, Kapton, Chromium, chemistry, 0103 physical sciences, Sublimation (phase transition), Neutron, 010306 general physics, Instrumentation, Titanium
Abstract

Thin 33S samples for the study of the 33S(n, α)30Si cross-section at the n_TOF facility at CERN were made by thermal evaporation of 33S powder onto a dedicated substrate made of kapton covered with thin layers of copper, chromium and titanium. This method has provided for the first time bare sulfur samples a few centimeters in diameter. The samples have shown an excellent adherence with no mass loss after few years and no sublimation in vacuum at room temperature. The determination of the mass thickness of 33S has been performed by means of Rutherford backscattering spectrometry. The samples have been successfully tested under neutron irradiation.

Published
2018

23. Measurement of the Ge70(n,γ) cross section up to 300 keV at the CERN n_TOF facility

Author

E. A. Maugeri, G. Cortes, A. Musumarra, Claudia Lederer-Woods, A. R. García, S. Warren, V. Variale, V. Bécares, C. Weiss, R. Vlastou, A. Tattersall, P. C. Rout, M. Brugger, F. Gunsing, Tanja Heftrich, P. V. Sedyshev, Cristian Massimi, P. Ferreira, Damir Bosnar, Y. Kadi, I. Knapova, M. Krtička, N. Patronis, M. A. Cortés-Giraldo, A. Riego-Perez, C. Beinrucker, D. M. Castelluccio, Alfredo Ferrari, Petar Žugec, P. Vaz, K. Göbel, M. Mirea, G. Tagliente, T. Martinez, K. Rajeev, B. Fernández-Domínguez, F. Calviño, H. Leeb, M. Bacak, G. Vannini, E. Leal-Cidoncha, Javier Praena, S. Lo Meo, I. Duran, Alberto Ventura, A. Kimura, T. Wright, Francesca Matteucci, V. Khryachkov, D. Macina, J. Perkowski, A. Gawlik, U. Battino, F. Mingrone, J. Andrzejewski, Thomas Rauscher, F. Käppeler, A. Pavlik, J. Marganiec, C. Domingo-Pardo, J. I. Porras, J. L. Tain, F. Bečvář, A. Saxena, Roberto Losito, S. Valenta, Carlos Guerrero, M. Kokkoris, Tatsuya Katabuchi, O. Aberle, C. Wolf, Mario Weigand, Mario Barbagallo, A. Casanovas, P. F. Mastinu, Marco Calviani, Carlo Rubbia, A. G. Smith, R. Dressler, E. Mendoza, S. Barros, L. Cosentino, D. Schumann, Philip Woods, Rene Reifarth, P. Kavrigin, E. Berthoumieux, N. Kivel, A. Tsinganis, Stefan Schmidt, L. Audouin, Nicola Colonna, V. Vlachoudis, E. González-Romero, J. M. Quesada, E. Chiaveri, L. Tassan-Got, E. Dupont, D. Cano-Ott, E. Griesmayer, Y. H. Chen, L. A. Damone, M. Caamaño, S. Heinitz, V. Furman, E. Jericha, V. Ketlerov, Alberto Mengoni, T. Glodariu, Paolo Finocchiaro, F. Cerutti, J. A. Ryan, D. G. Jenkins, Ariel Tarifeño-Saldivia, S. J. Lonsdale, J. Lerendegui-Marco, R. Cardella, I. F. Gonçalves, S. Montesano, A. Stamatopoulos, A. Oprea, J. Heyse, M. Mastromarco, Anton Wallner, J. Billowes, J. Balibrea, P. Schillebeeckx, Hideo Harada, M. Sabaté-Gilarte, M. Diakaki, R. Nolte, P. M. Milazzo, M. Dietz, and A. Goverdovski

Subjects
Physics, Standard solar model, Solar mass, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, 7. Clean energy, Neutron temperature, Nuclear physics, Neutron capture, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Neutron cross section, Astrophysics::Solar and Stellar Astrophysics, Neutron, Nuclear Experiment, 010306 general physics, s-process
Abstract

Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component of the slow neutron capture processes, which occurs in massive stars. The $(n,\gamma)$ cross section on $^{70}Ge$, which is mainly produced in the s process, was measured at the neutron time-of-flight facility n_TOF at CERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sections up to 300 keV. Stellar cross sections were calculated from $kT=5 keV$ to $kT=100 keV$ and are in very good agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average cross sections are in agreement with Walter and Beer (1985) over most of the neutron energy range covered, while they are systematically smaller for neutron energies above 150 keV. We have calculated isotopic abundances produced in s-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar). While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close to solar model shows a good global match to solar system abundances in the range of mass numbers A=60–80.

Published
2019

24. Measurement of the 235 U(n,f) cross section at n_TOF from thermal to 170 keV

Author

Emilio Andrea Maugeri, Alexandru Negret, Rene Reifarth, M. Kokkoris, M. Krtička, F. Mingrone, C. Lederer, I. Knapova, B. Fernández-Domínguez, F. Käppeler, P. Vaz, J. M. Quesada, L. Tassan-Got, P. J. Woods, A. Kalamara, Alberto Ventura, T. Martinez, N. Patronis, A. K. Saxena, Arnaud Ferrari, Alberto Mengoni, J. Billowes, G. Tagliente, F. Gunsing, A. Pavlik, G. Vannini, A. Oprea, A. Kimura, Cristian Massimi, C. Domingo-Pardo, M. Bacak, A. Casanovas, M. Caamaño, Y. H. Chen, Simone Gilardoni, L. Audouin, L. Cosentino, A. Masi, Mario Barbagallo, A. S. Brown, T. Glodariu, F. Bečvář, D. G. Jenkins, R. Vlastou, Rugard Dressler, D. Radeck, R. Cardella, M. Mastromarco, E. Berthoumieux, D. Bosnar, D. Macina, G. Cortes, Carlos Guerrero, E. Mendoza, F. Calviño, H. Leeb, J. L. Tain, Nicola Colonna, J. Marganiec, S. Heinitz, J. Perkowski, E. Dupont, F. Cerutti, Kathrin Göbel, A. Stamatopoulos, Peter Schillebeeckx, A. Manna, C. Weiss, Jan Heyse, P. M. Milazzo, M. A. Cortés-Giraldo, E. Chiaveri, N. V. Sosnin, P. F. Mastinu, Anton Wallner, D. Cano-Ott, M. Diakaki, Niko Kivel, Pedro G. Ferreira, Annamaria Mazzone, Petar Žugec, Deniz Kurtulgil, Javier Praena, S. Lo Meo, A. Musumarra, P. V. Sedyshev, J. Balibrea, S. Warren, Ariel Tarifeño-Saldivia, S. J. Lonsdale, V. Variale, Ignacio Porras, S. Amaducci, C. Rubbia, E. Jericha, O. Aberle, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, J. Lerendegui-Marco, V. Furman, T. J. Wright, I. F. Gonçalves, Hideo Harada, M. Sabaté-Gilarte, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, E. González-Romero, A. R. García, I. Duran, J. Andrzejewski, V. Vlachoudis, S. Valenta, Marco Calviani, A. G. Smith, Y. Kadi, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Anna Erickson, Marianne Hamm, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
cross-section, Cross-section, Fission, n_TOF, 235U, fission, neutron time of flight, 01 natural sciences, 7. Clean energy, Nuclear physics, uranium, Cross section (physics), Neutron flux, 0103 physical sciences, Neutron cross section, fission, Neutron, n_TOF, 010306 general physics, Nuclear Experiment, Neutrons, Physics, [PHYS]Physics [physics], 010308 nuclear & particles physics, neutrons, Order (ring theory), Neutron radiation, Standard, Neutron capture, Uranium, Other
Abstract

The [Formula: see text]U(n,f) cross section plays a key role for nuclear physics due to its widespread use as a standard reference for neutron cross section measurements and for neutron flux measurements. Recent experimental data of the fission cross section have suggested the presence of discrepancies around 6–8% with respect to the most used libraries, precisely in the range between 10 keV and 30 keV. In order to shed light on this disagreement, an accurate measurement of the [Formula: see text]U(n,f) fission cross section has been performed at n_TOF facility @CERN, using the standard reactions 6Li(n,t) and [Formula: see text]B(n,[Formula: see text] as reference. A custom experimental setup based on a stack of silicon detectors sandwiched between pairs of [Formula: see text]U, 6Li and [Formula: see text]B targets, has been installed along the neutron beam line to intercept the same neutron flux, allowing the detection of the fission fragments and the products of the reference reactions at the same time. Such a technique allows calculation of the cross section via the “ratio method”, by normalizing the [Formula: see text]U(n,f) reaction yields with respect to the reference reactions and to the recommended data in the IAEA libraries; in particular, the integral between 7.8 and 11 eV has been chosen. Accurate Monte Carlo simulations have allowed evaluation of the neutron absorption in the different layers, as well as the detection efficiency of each detector. The data are in excellent agreement with the standard values and highlight the overestimation of the [Formula: see text]U(n,f) cross section between 9 and 18 keV in the most recent libraries.

Published
2019

25. Erratum to: Cross section measurements of 155, 157Gd(n,$\gamma$γ) induced by thermal and epithermal neutrons

Author

G. Cortes, P. Kavrigin, D. M. Castelluccio, A. S. Brown, A. Manna, G. Tagliente, Ralf Nolte, C. Rubbia, F. Gunsing, D. Macina, Carlos Guerrero, O. Aberle, A. Musumarra, E. Griesmayer, L. A. Damone, G. Vannini, Kathrin Göbel, M. Krtička, A. Mengoni, Cristian Massimi, Jan Heyse, P. M. Milazzo, M. Caamaño, Simone Gilardoni, Deniz Kurtulgil, P. J. Woods, A. Kalamara, V. Furman, T. J. Wright, Alexandru Negret, T. Martinez, J. Lerendegui-Marco, J. Andrzejewski, B. Fernández-Domínguez, R. Vlastou, F. Käppeler, D. Radeck, E. Berthoumieux, A. Pavlik, N. Patronis, A. Casanovas, A. Kimura, Hideo Harada, A. K. Saxena, Y. H. Chen, L. Audouin, M. Sabaté-Gilarte, M. Bacak, N. V. Sosnin, Arnaud Ferrari, R. Cardella, Annamaria Mazzone, Petar Žugec, C. Domingo-Pardo, F. Mingrone, T. Glodariu, L. Cosentino, I. Duran, C. Lederer, I. F. Gonçalves, Pedro G. Ferreira, P. Sedyshev, E. Jericha, J. Marganiec, Rugard Dressler, F. Rocchi, Paolo Finocchiaro, R. Wynants, A. Stamatopoulos, F. Cerutti, Dorothea Schumann, M. Mastromarco, J. A. Ryan, Mario Barbagallo, E. Chiaveri, J. Billowes, P. F. Mastinu, J. L. Tain, Rene Reifarth, Nicola Colonna, E. Dupont, Vasilis Vlachoudis, Anton Wallner, A. R. García, J. M. Quesada, J. Balibrea, Niko Kivel, L. Tassan-Got, Javier Praena, Ignacio Porras, F. Bečvář, F. Calviño, H. Leeb, S. Valenta, E. Leal-Cidoncha, E. Mendoza, J. Perkowski, Giulia Clai, Peter Schillebeeckx, S. Warren, D. Bosnar, Emilio Andrea Maugeri, A. Gawlik, A. Guglielmelli, A. Masi, Thomas Rauscher, C. Weiss, Marco Calviani, V. Variale, M. Kokkoris, D. G. Jenkins, A. G. Smith, E. González-Romero, M. A. Cortés-Giraldo, Ariel Tarifeño-Saldivia, S. J. Lonsdale, I. Knapova, P. Vaz, Alberto Ventura, Y. Kadi, A. Oprea, S. Heinitz, D. Cano-Ott, and M. Diakaki

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Hadron, Thermal, Nuclear fusion, Epithermal neutron, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries)
Abstract

After publication of the paper, the authors noticed some errors in the list of authors and in the list of affiliations. Their correct version is given in this erratum.

Published
2019

26. Measurement of 73Ge(n,g) cross sections and implications for stellar nucleosynthesis

Author

S. Montesano, V. Khryachkov, A. Tsinganis, Alfredo Ferrari, F. R. Palomo-Pinto, Nicola Colonna, E. Dupont, A. Goverdovski, G. Tagliente, J. Heyse, A. Musumarra, Claudia Lederer-Woods, M. Mastromarco, F. Gunsing, Cristian Massimi, Pedro G. Ferreira, Mario Weigand, I. Duran, E. Mendoza, Anton Wallner, M. Bacak, P. V. Sedyshev, M. Mirea, J. Balibrea, V. Furman, F. Calviño, H. Leeb, Ioana Gheorghe, J. Perkowski, Tanja Heftrich, S. Heinitz, J. Billowes, M. Sabaté-Gilarte, A. Kimura, Francesca Matteucci, A. Riego-Perez, T. Glodariu, M. Krtička, A. Hernández-Prieto, S. Warren, V. Bécares, L. Cosentino, N. Patronis, R. Dressler, Roberto Losito, M. S. Robles, T. Martinez, E. Jericha, C. Weiss, D. Macina, R. Vlastou, V. Variale, Paolo Finocchiaro, A. Stamatopoulos, P. M. Milazzo, O. Aberle, J. A. Ryan, D. G. Jenkins, E. Berthoumieux, Mario Barbagallo, M. Diakaki, Alberto Mengoni, J. Marganiec, Carlos Guerrero, F. Bečvář, A. Saxena, S. V. Suryanarayana, D. Schumann, Damir Bosnar, Y. Kadi, E. González-Romero, P. F. Mastinu, A. Tattersall, P. Schillebeeckx, Hideo Harada, M. A. Cortés-Giraldo, P. Kavrigin, F. Mingrone, S. Valenta, J. Andrzejewski, Ralf Nolte, Marco Calviani, V. Vlachoudis, M. Kokkoris, Rene Reifarth, E. Griesmayer, A. G. Smith, Petar Žugec, C. Paradela, M. Dietz, Stefan Schmidt, L. A. Damone, L. Audouin, J. M. Quesada, L. Tassan-Got, K. Göbel, B. Fernández-Domínguez, F. Käppeler, T. Wright, Tatsuya Katabuchi, S. Barros, U. Battino, A. Pavlik, C. Domingo-Pardo, E. Chiaveri, D. Cano-Ott, J. I. Porras, I. Knapova, P. Vaz, Alberto Ventura, C. Rubbia, J. L. Tain, Niko Kivel, G. Cortes, J. Lerendegui-Marco, A. R. García, M. Brugger, I. F. Gonçalves, R. J. W. Frost, C. Beinrucker, E. Leal-Cidoncha, Javier Praena, S. Lo Meo, Fabio Belloni, G. Vannini, A. Gawlik, Thomas Rauscher, Ariel Tarifeño-Saldivia, M. Licata, K. Deo, M. Caamaño, V. Ketlerov, F. Cerutti, Lederer-Woods, C., Battino, U., Ferreira, P., Gawlik, A., Guerrero, C., Gunsing, F., Heinitz, S., Lerendegui-Marco, J., Mengoni, A., Reifarth, R., Tattersall, A., Valenta, S., Weiss, C., Aberle, O., Andrzejewski, J., Audouin, L., Becares, V., Bacak, M., Balibrea, J., Barbagallo, M., Barros, S., Becvar, F., Beinrucker, C., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cerutti, F., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Deo, K., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Finocchiaro, P., Frost, R. J. W., Furman, V., Gobel, K., Garcia, A. R., Gheorghe, I., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Goverdovski, A., Griesmayer, E., Harada, H., Heftrich, T., Hernandez-Prieto, A., Heyse, J., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Katabuchi, T., Kavrigin, P., Ketlerov, V., Khryachkov, V., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Leal-Cidoncha, E., Leeb, H., Licata, M., Lo Meo, S., Losito, R., Macina, D., Marganiec, J., Martinez, T., Massimi, C., Mastinu, P., Mastromarco, M., Matteucci, F., Mendoza, E., Milazzo, P. M., Mingrone, F., Mirea, M., Montesano, S., Musumarra, A., Nolte, R., Palomo-Pinto, F. R., Paradela, C., Patronis, N., Pavlik, A., Perkowski, J., Porras, J. I., Praena, J., Quesada, J. M., Rauscher, T., Riego-Perez, A., Robles, M., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Sedyshev, P., Smith, A. G., Stamatopoulos, A., Suryanarayana, S. V., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Tsinganis, A., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weigand, M., Wright, T., Zugec, P., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), n_TOF, Ministerio de Economía y Competitividad (España), Bécares, V., Bečvář, F., Caamaño, M., Calviño, F., Cortés, G., Cortés-Giraldo, M.A., Damone, L.A., Durán, I., Fernández-Domínguez, B., Frost, R.J.W., Göbel, K., García, A.R., Gonçalves, I.F., González-Romero, E., Hernández-Prieto, A., Jenkins, D.G., Käppeler, F., Krtička, M., Martínez, T., Milazzo, P.M., Palomo-Pinto, F.R., Porras, J.I., Quesada, J.M., Ryan, J.A., Sabaté-Gilarte, M., Smith, A.G., Suryanarayana, S.V., Tain, J.L., Tarifeño-Saldivia, A., Žugec, P., Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nucleosynthesis, Neutron capture, s process, Germanium, n_TOF, s proce, Nuclear reaction, Natural abundance, nucl-ex, 01 natural sciences, 7. Clean energy, Stellar nucleosynthesis, CERN, Astrophysics::Solar and Stellar Astrophysics, n_TOF, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Cross section, Germanium, lcsh:QC1-999, PRIRODNE ZNANOSTI. Fizika, Neutron capture, Nucleosynthesis, s process, Nucleosíntesi, Nuclear and High Energy Physics, nTOF, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Neutron, Neutrons--Captura, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Neutrons--Capture, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, 010306 general physics, Nucleosynthesi, Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Capture cross section, NATURAL SCIENCES. Physics, Stars, 13. Climate action, s-process, lcsh:Physics
Abstract

73Ge(n, γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300keV, providing for the first time experimental data above 8keV. Results indicate that the stellar cross section at kT=30keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system., This work was supported by the Austrian Science Fund FWF (J3503), the Adolf Messer Foundation (Germany), the UK Science and Facilities Council (ST/M006085/1), and the European Research Council ERC-2015-StG Nr.677497.

Published
2019
Full Text
View/download PDF

27. Update of the BIPM comparison BIPM.RI(II)-K1.Co-60 of activity measurements of the radionuclide 60Co to include the 2017 result of the PTB (Germany) and the 2018 result of the TAEK (Turkey)

Author

C Michotte, A. Dirican, J. Marganiec-Gałązka, S Judge, Ole Nähle, E. Yeltepe, Karsten Kossert, R Coulon, M Nonis, and S Courte

Subjects
Radionuclide, Activity measurements, Radiochemistry, General Engineering, Environmental science
Abstract

Main text Since 1976, 28 laboratories have submitted 72 samples of 60Co to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)- K1.Co-60. Recently, the PTB (Germany) and the TAEK (Turkey) participated in the comparison and the key comparison reference value (KCRV) has been updated to include the PTB result. The degrees of equivalence between each equivalent activity measured in the SIR and the updated KCRV have been calculated and the results are given in the form of a table. A graphical presentation is also given. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Published
2020

28. Measurement of the angular distribution of fission fragments using a PPAC assembly at CERN n_TOF

Author

F. Mingrone, M. J. Vermeulen, J. Andrzejewski, P. E. Koehler, C. Langer, F. Gunsing, Petar Žugec, Carlos Guerrero, Damir Bosnar, C. Le Naour, Y. Kadi, S. Valenta, Marco Calviani, I. F. Gonçalves, F. Käppeler, T. Ware, J. Mottier, D. G. Jenkins, M. B. Gómez-Hornillos, M. P. W. Chin, J. Billowes, F. Cerutti, Cristian Massimi, V. Bécares, C. Paradela, E. Griesmayer, A. Pavlik, Fabio Belloni, L. Audouin, Srinivasan Ganesan, P. Gurusamy, F. Roman, Rene Reifarth, Stefan Schmidt, G. Vannini, C. Domingo-Pardo, G. Giubrone, M. A. Cortés-Giraldo, Vittorio Boccone, J. M. Quesada, M. Meaze, W. Mondalaers, Mario Barbagallo, M. Caamaño, L. Tassan-Got, D. Cano-Ott, M. Diakaki, A. Tsinganis, I. Duran, A. R. García, Ch.O. Bacri, A. Manousos, Nicola Colonna, L.S. Leong, R. Vlastou, P. F. Mastinu, Vasilis Vlachoudis, M. Brugger, J. Marganiec, Mario Weigand, G. Cortes, E. Berthoumieux, A. Ventura, D. Tarrío, V. Petitbon, Alberto Mengoni, P. M. Milazzo, Arnaud Ferrari, S. Altstadt, G. Tagliente, C. Eleftheriadis, Roberto Losito, F. Bečvář, E. Chiaveri, M. Mirea, Thomas Rauscher, E. Jericha, E. Mendoza, C. Rubbia, C. Weiß, D. Karadimos, M. Kokkoris, T. J. Wright, Peter Schillebeeckx, N. Dzysiuk, C. Lederer, E. González-Romero, P. Vaz, H. Leeb, Javier Praena, M. Mastromarco, J. Perkowski, K. Fraval, C. Carrapiço, Anton Wallner, M. Krtička, F. Calviño, V. Variale, J. L. Tain, Roberto Versaci, T. Martinez, A. Riego, A. J. M. Plompen, Jeri Kroll, R. Sarmento, D. Tarrio, L. S. Leong, L. Audouin, I. Duran, C. Paradela, L. Tassan-Got, C. L. Naour, C. O. Bacri, V. Petitbon, J. Mottier, M. Caamano, S. Altstadt, J. Andrzejewski, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimo, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, R. Losito, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx, S. Schmidt, G. Tagliente, J. L. Tain, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. J. Wright, P. Zugec, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Neutron, Anisotropy, Angular distribution, 232Th, Gas detectors, Subatomär fysik, Nuclear physics, Energia nuclea, Subatomic Physics, Detectors and Experimental Techniques, Th-232, Nuclear Experiment, Instrumentation, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Large Hadron Collider, Detector, Nuclear energy, Actinide, Neutron radiation, NEUTRON INDUCED FISSION, Nuclear fission, Física nuclear, ANGULAR DISTRIBUTIONS, TIME OF FLIGHT
Abstract

A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced fission of actinides at the neutron beam available at the Neutron Time-Of-Flight (n_TOF) facility at CERN. The detectors and the samples were tilted 45 degrees with respect to the neutron beam direction to cover all the possible values of the emission angle of the fission fragments. The main features of this setup are discussed and results on the fission fragment angular distribution are provided for the Th-232(n,f) reaction around the fission threshold. The results are compared with the available data in the literature, demonstrating the good capabilities of this setup. (C) 2014 Elsevier B.V. All rights reserved. A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced fission of actinides at the neutron beam available at the Neutron Time-Of-Flight (n-TOF) facility at CERN. The detectors and the samples were tilted 45 with respect to the neutron beam direction to cover all the possible values of the emission angle of the fission fragments. The main features of this setup are discussed and results on the fission fragment angular distribution are provided for the 232Th(n,f) reaction around the fission threshold. The results are compared with the available data in the literature, demonstrating the good capabilities of this setup. © 2014 Elsevier B.V.

Published
2014
Full Text
View/download PDF

29. Update of the BIPM comparison BIPM.RI(II)-K1.Mn-54 of activity measurements of the radionuclide 54Mn to include the 2017 result of the PTB (Germany) and the linked results from the CCRI(II)-K2.Mn-54 comparison

Author

Karsten Kossert, J. Marganiec-Gałązka, S Courte, C Michotte, and M Nonis

Subjects
Radionuclide, Activity measurements, Chemistry, Radiochemistry, General Engineering
Abstract

This report concerns an updated submission of a 54Mn standard by the Physikalisch-Technische Bundesanstalt (PTB) to the BIPM.RI(II)-K1.Mn-54 comparison. The result has been added to the previous results and this has produced a revised value for the key comparison reference value (KCRV), calculated using the power-moderated weighted mean. A link has been made to the CCRI(II)-K2.Mn-54 comparison held in 2003 by measurement of the K2 54Mn solution in the International Reference System (SIR). The degrees of equivalence between each equivalent activity measured in the SIR and the KCRV have been calculated for the remaining six NMIs in the BIPM.RI(II)-K1.Mn-54 comparison and the fourteen other participants in the CCRI(II)-K2.Mn-54 comparison. A graphical presentation is included. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Published
2020

30. Measurement and analysis of 155,157Gd(n,γ) from thermal energy to 1 keV

Author

A. Mengoni, J. Marganiec, F. Bečvář, E. Chiaveri, A. Kimura, S. Valenta, Mario Barbagallo, E. Mendoza, P. F. Mastinu, C. Rubbia, Marco Calviani, G. Tagliente, A. Musumarra, A. G. Smith, L. Audouin, Peter Schillebeeckx, G. Vannini, A. Masi, Javier Praena, Emilio Andrea Maugeri, M. Caamaño, D. G. Jenkins, I. Duran, S. Warren, B. Fernández-Domínguez, P. Console Camprini, A. Guglielmelli, F. Käppeler, M. Kokkoris, A. Casanovas, A. Negret, D. Bosnar, V. Variale, Deniz Kurtulgil, Simone Gilardoni, A. Kalamara, P. V. Sedyshev, Rugard Dressler, Hideo Harada, P. J. Woods, M. Sabaté-Gilarte, L. Cosentino, Y. Kadi, A. R. García, N. Patronis, A. K. Saxena, R. Mucciola, J. L. Tain, M. A. Cortés-Giraldo, Y. H. Chen, R. Cardella, D. M. Castelluccio, J. Andrzejewski, D. Cano-Ott, Arnaud Ferrari, Niko Kivel, A. Manna, M. Diakaki, E. Dupont, J. Billowes, P. Kavrigin, C. Weiss, M. Mastromarco, D. Macina, F. Cerutti, Carlos Guerrero, Ralf Nolte, F. Calviño, Nicola Colonna, E. Griesmayer, L. A. Damone, H. Leeb, Kathrin Göbel, Anton Wallner, Ariel Tarifeño-Saldivia, S. J. Lonsdale, E. Leal-Cidoncha, J. Balibrea, Vasilis Vlachoudis, A. Pavlik, M. Krtička, C. Domingo-Pardo, J. Perkowski, J. Lerendegui-Marco, E. Jericha, Jan Heyse, Giulia Clai, A. Stamatopoulos, Paolo Finocchiaro, A. Gawlik, T. Martinez, Dorothea Schumann, Thomas Rauscher, S. Heinitz, J. A. Ryan, I. F. Gonçalves, Pedro G. Ferreira, I. Knapova, P. Vaz, A. S. Brown, Alberto Ventura, E. González-Romero, F. Gunsing, Cristian Massimi, Ignacio Porras, P. M. Milazzo, V. Furman, T. J. Wright, M. Bacak, T. Glodariu, R. Vlastou, D. Radeck, E. Berthoumieux, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, Rene Reifarth, J. M. Quesada, L. Tassan-Got, A. Oprea, F. Rocchi, O. Aberle, F. Mingrone, C. Lederer, G. Cortes, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Ge, Z., Shu, N., Chen, Y., Wang, W., Zhang, H., Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Nuclear reaction, Materials science, Isotope, 010308 nuclear & particles physics, business.industry, Physics, QC1-999, n_TOF, 155Gd, 157Gd, neutron capture, neutron time of flight, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Neutron temperature, Nuclear physics, Cross section (physics), Yield (chemistry), 0103 physical sciences, Thermal, Nuclear Physics - Experiment, 010306 general physics, business, Thermal energy
Abstract

We have measured the capture cross section of the 155Gd and 157Gd isotopes between 0.025 eV and 1 keV. The capture events were recorded by an array of 4 C6D6 detectors, and the capture yield was deduced exploiting the total energy detection system in combination with the Pulse Height Weighting Techniques. Because of the large cross section around thermal neutron energy, 4 metallic samples of different thickness were used to prevent problems related to self-shielding. The samples were isotopically enriched, with a cross contamination of the other isotope of less than 1.14%. The capture yield was analyzed with an R-Matrix code to describe the cross section in terms of resonance parameters. Near thermal energies, the results are significantly different from evaluations and from previous time-of-flight experiments. The data from the present measurement at n_TOF are publicly available in the experimental nuclear reaction database EXFOR. European Atomic Energy Community (Euratom) 605203 Ministerio de Economía y Competitividad FPA2014-52823-C2-1- P

Published
2020

31. Preliminary results on the 233U α-ratio measurement at n_TOF

Author

O. Serot, Stefan Kopecky, Y. H. Chen, Rene Reifarth, J. M. Quesada, L. Tassan-Got, Calviani, B. Laurent, J. Lerendegui-Marco, M. A. Cortés-Giraldo, A. Kimura, Alexandru Negret, L. Mathieu, Y. Kadi, P. J. Woods, B. Fernández-Domínguez, F. Käppeler, L. Cosentino, Hideo Harada, A. Musumarra, G. Vannini, I. Knapova, M. Mastromarco, N. Patronis, E. Jericha, A. K. Saxena, A. Oprea, Pedro G. Ferreira, Mario Barbagallo, Arnaud Ferrari, Anton Wallner, Paolo Finocchiaro, M. Krtička, F. Mingrone, Dorothea Schumann, J. Balibrea, T. Martinez, I. F. Gonçalves, J. A. Ryan, J. Billowes, S. Valenta, C. Lederer, V. Furman, T. J. Wright, A. Masi, P. Vaz, D. G. Jenkins, A. G. Smith, F. Gunsing, J. Marganiec, Colonna, Emilio Andrea Maugeri, A. S. Brown, A. Manna, N. V. Sosnin, M. Kokkoris, M. Caamaño, Cristian Massimi, Kathrin Göbel, Annamaria Mazzone, Petar Žugec, Rugard Dressler, Alberto Ventura, G. Tagliente, E. Chiaveri, D. Cano-Ott, P. F. Mastinu, J. Andrzejewski, M. Diakaki, P. M. Milazzo, Jan Heyse, F. Calviño, H. Leeb, O. Aberle, D. Bosnar, J. Perkowski, V. Vlachoudis, A. Casanovas, C. Rubbia, C. Weiss, L. Audouin, Ignacio Porras, M. Bacak, R. Vlastou, G. Cortes, D. Radeck, E. Berthoumieux, F. Bečvář, A. Kalamara, S. Heinitz, J. L. Tain, E. Mendoza, A. Pavlik, Niko Kivel, C. Domingo-Pardo, Peter Schillebeeckx, S. Warren, V. Variale, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Cerutti, Simone Gilardoni, R. Cardella, E. Leal-Cidoncha, Javier Praena, S. Lo Meo, P. Kavrigin, A. Gawlik, Thomas Rauscher, Ralf Nolte, E. Griesmayer, L. A. Damone, E. González-Romero, A. Mengoni, M. Aiche, I. Duran, A. R. García, T. Glodariu, D. Macina, Carlos Guerrero, J. Taieb, Deniz Kurtulgil, P. V. Sedyshev, A. Stamatopoulos, G. Bélier, E. Dupont, M. Sabaté-Gilarte, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA Cadarache, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), n_TOF, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ge, Z., Shu, N., Chen, Y., Wang, W., and Zhang, H.

Subjects
Physics, Coupling, Fissile material, 010308 nuclear & particles physics, Fission, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Calorimeter, Neutron capture, Cross section (physics), 0103 physical sciences, Nuclear Physics - Experiment, Nuclear Experiment, 010306 general physics, Absorption (electromagnetic radiation), n_TOF, 233U, alpha-ratio, neutron time of flight, Order of magnitude
Abstract

This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT. The authors would like to acknowledge more specifically JRC Geel for targets preparation and for providing full support for a first test measurement of the fission chamber at GELINA., U-233 is the fissile nuclei in the Th-U fuel cycle with a particularily small neutron capture cross setion which is on average about one order of magnitude lower than its fission cross section. Hence, the measurement of the U-233(n,gamma) cross section relies on a method to accurately distinguish between capture and fission gamma-rays. A measurement of the U-233 alpha-ratio has been performed at the n_TOF facility at CERN using a so-called fission tagging setup, coupling nTOF 's Total Absorption Calorimeter with a novel fission chamber to tag the fission gamma-rays. The experimental setup is described and essential parts of the analysis are discussed. Finally, a preliminary U-233 alpha-ratio is presented., French NEEDS/NACRE Project, European Commission within HORIZON2020 via the EURATOM Project EUFRAT

Published
2020

32. Preliminary results on the $^{233}U$ capture cross section and alpha ratio measured at n_TOF (CERN) with the fission tagging technique

Author

A. S. Brown, M. Krtička, F. Calviño, H. Leeb, J. Perkowski, T. Martinez, Rene Reifarth, J. M. Quesada, L. Tassan-Got, Pedro G. Ferreira, M. Sabaté-Gilarte, P. M. Milazzo, F. Gunsing, J. Marganiec, A. Pavlik, C. Domingo-Pardo, Cristian Massimi, L. Audouin, M. Bacak, L. Cosentino, B. Laurent, D. Cano-Ott, M. Diakaki, A. Musumarra, C. Rubbia, A. Kimura, T. Glodariu, E. Chiaveri, O. Serot, Stefan Kopecky, P. F. Mastinu, F. Cerutti, S. Warren, A. Oprea, E. Jericha, I. Knapova, Paolo Finocchiaro, G. Bélier, P. Vaz, R. Vlastou, D. Radeck, Dorothea Schumann, S. Heinitz, Mario Barbagallo, Rugard Dressler, J. A. Ryan, E. Berthoumieux, V. Variale, M. Mastromarco, A. Kalamara, Alberto Ventura, D. Macina, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Mingrone, Carlos Guerrero, C. Lederer, M. A. Cortés-Giraldo, Anton Wallner, L. Mathieu, Ignacio Porras, Simone Gilardoni, Nicola Colonna, D. Bosnar, J. Balibrea, J. Taieb, E. Dupont, Vasilis Vlachoudis, A. Manna, F. Bečvář, Emilio Andrea Maugeri, G. Tagliente, J. Lerendegui-Marco, E. Mendoza, R. Cardella, V. Furman, I. F. Gonçalves, T. J. Wright, C. Weiss, M. Kokkoris, Peter Schillebeeckx, N. V. Sosnin, Annamaria Mazzone, O. Aberle, A. Casanovas, Kathrin Göbel, Petar Žugec, S. Valenta, Y. H. Chen, Hideo Harada, J. L. Tain, A. Masi, Jan Heyse, Javier Praena, S. Lo Meo, D. G. Jenkins, Niko Kivel, Deniz Kurtulgil, N. Patronis, P. V. Sedyshev, A. K. Saxena, Arnaud Ferrari, A. Stamatopoulos, J. Billowes, Marco Calviani, A. G. Smith, Alexandru Negret, B. Fernández-Domínguez, F. Käppeler, Philip Woods, E. Leal-Cidoncha, Y. Kadi, A. Gawlik, Thomas Rauscher, G. Vannini, M. Caamaño, J. Andrzejewski, G. Cortes, E. González-Romero, A. Mengoni, M. Aiche, I. Duran, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, A. R. García, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Saclay, Université de Bordeaux (UB), CEA Cadarache, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Serot, O., and Chebboubi, A.

Subjects
Nuclear reaction, Fission, Physics::Instrumentation and Detectors, QC1-999, Nuclear physics, 01 natural sciences, 7. Clean energy, 0103 physical sciences, CERN, Neutron, n_TOF, 010306 general physics, Nuclear Experiment, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, [PHYS]Physics [physics], Large Hadron Collider, Fissile material, Física [Àrees temàtiques de la UPC], Cross section, 010308 nuclear & particles physics, Calorimeter, Neutron capture, n_TOF, 233U, neutron capture, alpha ratio, fission tagging, Ionization chamber, Física nuclear, Other
Abstract

233U is of key importance among the fissile nuclei in the Th-U fuel cycle. A particularity of 233U is its small neutron capture cross-section, which is on average about one order of magnitude lower than the fission cross-section. The accuracy in the measurement of the 233U capture cross-section depends crucially on an efficient capture-fission discrimination, thus a combined set-up of fission and γ-detectors is needed. A measurement of the 233U capture cross-section and capture-to-fission ratio was performed at the CERN n_TOF facility. The Total Absorption Calorimeter (TAC) of n_TOF was employed as γ-detector coupled with a novel compact ionization chamber as fission detector. A brief description of the experimental set-up will be given, and essential parts of the analysis procedure as well as the preliminary response of the set-up to capture are presented and discussed.

Published
2018

33. Structure of Be13 studied in proton knockout from B14

Author

Roy Crawford Lemmon, C. Wimmer, U. Datta Pramanik, K. Goebel, I. Syndikus, Nasser Kalantar-Nayestanaki, C. Wheldon, Enrique Nácher, Thomas Aumann, J. S. Winfield, Andreas Martin Heinz, N. Kurz, L. M. Fraile, Hans Geissel, Rene Reifarth, Mikhail V. Zhukov, J. Marganiec, E. Cravo, P. Velho, M. Heine, M. Caamaño, M. Roeder, O. Ershova, Alfredo Estrade, Martin Freer, Daniel Bemmerer, G. L. Wilson, P. J. Woods, S. Pietri, Z. Elekes, G. Ribeiro, Björn Jonson, J. M. Boillos, Joakim Cederkäll, J. Taylor, J. Hagdahl, Herbert A. Simon, Paloma Diaz Fernandez, T. Kroell, Andreas Wagner, Matthias Heil, R. Crespo, A. Ignatov, M. J. G. Borge, K. Riisager, Roman Gernhaeuser, K. Boretzky, A. Movsesyan, Andreas Zilges, Carlos A. Bertulani, A. Hufnagel, H. O. U. Fynbo, A. Kelic-Heil, V. Panin, T. Le Bleis, Christoph Langer, D. Cortina-Gil, L. Atar, E. Casarejos, R. Thies, Jorge Machado, Joachim Enders, Olof Tengblad, Marina Petri, Ralf Plag, J. Benlliure, Deniz Savran, D. M. Rossi, Marielle Chartier, C. Caesar, Y. Aksyutina, Simon Lindberg, Catherine Rigollet, L. V. Chulkov, Daniel Galaviz, M. Holl, O. Sorlin, C. Nociforo, Helmut Weick, Håkan T Johansson, H. Scheit, W. N. Catford, Ángel Perea, Vladimir Avdeichikov, I. Dillmann, Pavel Golubev, F. Farinon, Stefanos Paschalis, H. Alvarez-Pol, R. Kanungo, Marine Vandebrouck, Kai Zuber, M. Labiche, A. Henriques, S. Beceiro-Novo, Thomas Nilsson, F. Wamers, and Tanja Heftrich

Subjects
Physics, Nuclear reaction, Proton, 010308 nuclear & particles physics, Nuclear Theory, Gamma ray, Halo nucleus, 01 natural sciences, Resonance (particle physics), Nuclear physics, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The neutron-unbound isotope Be-13 has been studied in several experiments using different reactions, different projectile energies, and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the Be-13 structure, is a challenge, particularly in light of its bridging role between Be-12, where the N = 8 neutron shell breaks down, and the Borromean halo nucleus Be-14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be-12 after proton knockout from B-14, by measuring coincidences between Be-12, neutrons, and gamma rays originating from de-excitation of states fed by neutron decay of Be-13. The Be-13 isotopes were produced in proton knockout from a 400 MeV/nucleon B-14 beam impinging on a CH2 target. The Be-12-n relative-energy spectrum d sigma/dE(fn) was obtained from coincidences between Be-12(g.s.) and a neutron, and also as threefold coincidences by adding gamma rays, from the de-excitation of excited states in Be-12. Neutron decay from the first 5/2(+) state in Be-13 to the 2(+) state in Be-12 at 2.11 MeV is confirmed. An energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon B-14 beam. A low-lying p-wave resonance in Be-13(1/2(-)) is confirmed by comparing proton- and neutron-knockout data from B-14 and Be-14.

Published
2018

34. Be7(n,p)Li7 Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN

Author

Ralf Nolte, E. Griesmayer, L. A. Damone, T. Stora, G. Cortes, J. Lerendegui-Marco, G. Bellia, I. Duran, J. Balibrea-Correa, G. Tagliente, Alexandru Negret, A. Mengoni, I. F. Gonçalves, A. S. Brown, A. Kalamara, Juliana Schell, N. V. Sosnin, Annamaria Mazzone, A. Kimura, Srinivasan Ganesan, A. García-Rios, F. Gunsing, B. Fernández-Domínguez, F. Käppeler, P. J. Woods, Petar Žugec, Rene Reifarth, V. Bécares, S. Heinitz, Cristian Massimi, Ignacio Porras, N. Patronis, A. K. Saxena, Arnaud Ferrari, A. Casanovas, P. M. Milazzo, P. Vaz, Javier Praena, S. Lo Meo, F. Bečvář, Stefan Schmidt, E. Jericha, S. Valenta, M. Bacak, C. Wolf, E. Mendoza, Paolo Finocchiaro, Dorothea Schumann, C. Weiß, Marco Calviani, Cortés-Giraldo, J. M. Quesada, L. Tassan-Got, J. A. Ryan, Peter Schillebeeckx, R. Vlastou, D. Radeck, G. Vannini, A. G. Smith, T.D. Goodacre, M. Mirea, C. Rubbia, A. Stamatopoulos, D. Cano-Ott, A.P. Bernardes, Hideo Harada, M. Brugger, J. Billowes, E. Berthoumieux, M. Mastromarco, M. Diakaki, Sergio Cristallo, C. Seiffert, M. Ayranov, F. Cerutti, D. Bosnar, C. Beinrucker, Massimo Barbagallo, M. Caamaño, E. Leal-Cidoncha, F. Calviño, Simone Gilardoni, T. Glodariu, Roberto Losito, H. Leeb, Maurizio Busso, Anton Wallner, A. Oprea, J. Andrzejewski, A. Gawlik, T. J. Wright, S. Altstadt, R. Cardella, S. Warren, M. Piscopo, Thomas Rauscher, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Y. Kadi, J. Perkowski, Emilio Andrea Maugeri, Rugard Dressler, V. Variale, J. Marganiec, M. Kokkoris, A. Musumarra, A. Dorsival, A. Pavlik, Tatsuya Katabuchi, A. Ventura, Kathrin Göbel, E. González-Romero, A. Masi, A. Tsinganis, Luciano Piersanti, Tanja Heftrich, C. Domingo-Pardo, D. G. Jenkins, A. Riego-Perez, Jan Heyse, Vasilis Vlachoudis, Pedro G. Ferreira, Mario Weigand, M. Sabaté-Gilarte, B. Marsh, L. Audouin, J.G. Martins Correia, P. C. Rout, F. Mingrone, S. Rothe, M. Dietz, L. Cosentino, A. J. M. Plompen, Claudia Lederer-Woods, W.I. Furman, Deniz Kurtulgil, P. V. Sedyshev, E. Dupont, M.J.G. Borge, D. M. Castelluccio, D. Macina, Carlos Guerrero, E. Chiaveri, P. F. Mastinu, K. Rajeev, N. Colonna, Francesca Matteucci, Y. H. Chen, Karl Johnston, M. Krtička, J. Ballof, T. Martinez, O. Aberle, J. L. Tain, U. Kohester, Niko Kivel, R. Catherall, and P. Kavrigin

Subjects
Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, Cosmology, Neutron temperature, Nuclear physics, chemistry, Nucleosynthesis, 0103 physical sciences, Neutron, Lithium, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

We report on the measurement of the $^{7}$Be($n, p$)$^{7}$Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n\_TOF facility at CERN. This reaction plays a key role in the lithium yield of the Big Bang Nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and showed a large discrepancy between each other. The measurement was performed with a Si-telescope, and a high-purity sample produced by implantation of a $^{7}$Be ion beam at the ISOLDE facility at CERN. While a significantly higher cross section is found at low-energy, relative to current evaluations, in the region of BBN interest the present results are consistent with the values inferred from the time-reversal $^{7}$Li($p, n$)$^{7}$Be reaction, thus yielding only a relatively minor improvement on the so-called Cosmological Lithium Problem (CLiP). The relevance of these results on the near-threshold neutron production in the p+$^{7}$Li reaction is also discussed.

Published
2018

35. $^{7}$ Be(n,p)$^{7}$ Li Cross Section Measurement for the Cosmological Lithium Problem at the n $\_$ TOF Facility at CERN

Author

M.J.G. Borge, D. M. Castelluccio, Rene Reifarth, A. Kimura, Stefan Schmidt, Srinivasan Ganesan, D. Macina, Carlos Guerrero, Cortés-Giraldo, G. Bellia, J. M. Quesada, L. Tassan-Got, P. J. Woods, Ignacio Porras, Sergio Cristallo, I. Duran, A. Mengoni, V. Bcares, Alexandru Negret, Juliana Schell, A. Casanovas, K. Rajeev, A. K. Saxena, Tatsuya Katabuchi, A. Ventura, J. Lerendegui-Marco, Maurizio Busso, M. Piscopo, Ariel Tarifeño-Saldivia, S. J. Lonsdale, B. Fernández-Domínguez, S. Rothe, F. Käppeler, Francesca Matteucci, R. Catherall, I. F. Gonçalves, P. Kavrigin, L. Cosentino, D. Bosnar, Ralf Nolte, Javier Praena, S. Lo Meo, M. Brugger, E. Griesmayer, A. Stamatopoulos, L. A. Damone, C. Beinrucker, T. Stora, Claudia Lederer-Woods, E. Leal-Cidoncha, W.I. Furman, E. Chiaveri, A. Gawlik, Thomas Rauscher, P. F. Mastinu, D. Cano-Ott, A.P. Bernardes, Deniz Kurtulgil, P. V. Sedyshev, M. Diakaki, A. S. Brown, J. L. Tain, U. Kohester, J. Balibrea-Correa, E. González-Romero, Niko Kivel, O. Aberle, J. Billowes, N. Colonna, A. Oprea, J. Andrzejewski, A. Pavlik, Y. Kadi, C. Domingo-Pardo, Y. H. Chen, C. Rubbia, Kathrin Göbel, J. Marganiec, B. Marsh, P. M. Milazzo, S. Valenta, Karl Johnston, N. Patronis, G. Tagliente, F. Cerutti, R. Vlastou, Marco Calviani, A. G. Smith, D. Radeck, G. Corts, E. Berthoumieux, P. Vaz, A. Masi, Jan Heyse, D. G. Jenkins, T.D. Goodacre, C. Seiffert, M. Ayranov, Emilio Andrea Maugeri, M. Krtička, Simone Gilardoni, A. Musumarra, J. Ballof, E. Jericha, A. Dorsival, Paolo Finocchiaro, T. Martinez, Dorothea Schumann, M. Kokkoris, C. Weiß, S. Heinitz, J. A. Ryan, Tanja Heftrich, N. V. Sosnin, R. Cardella, A. Riego-Perez, Annamaria Mazzone, Petar Žugec, S. Altstadt, L. Audouin, S. Warren, G. Vannini, F. Bečvář, V. Variale, C. Wolf, E. Mendoza, M. Caamaño, Peter Schillebeeckx, P. C. Rout, A. Kalamara, F. Mingrone, T. J. Wright, E. Dupont, M. Mastromarco, A. J. M. Plompen, A. Garca-Rios, Massimo Barbagallo, M. Dietz, Anton Wallner, Hideo Harada, J.G. Martins Correia, M. Mirea, Rugard Dressler, F. Calviño, H. Leeb, M. Sabaté-Gilarte, A. Tsinganis, Luciano Piersanti, J. Perkowski, F. Gunsing, Vasilis Vlachoudis, Cristian Massimi, A. Ferrari, Pedro G. Ferreira, Mario Weigand, M. Bacak, T. Glodariu, Roberto Losito, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), n_TOF, ILL, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Damone, L. A., Barbagallo, M., Mastromarco, M., Mengoni, A., Colonna, N., Cosentino, L., Maugeri, E. A., Heinitz, S., Schumann, D., Dressler, R., Kappeler, F., Finocchiaro, P., Andrzejewski, J., Perkowski, J., Gawlik, A., Aberle, O., Altstadt, S., Ayranov, M., Audouin, L., Bacak, M., Balibrea-Correa, J., Ballof, J., Bcares, V., Becvar, F., Beinrucker, C., Bellia, G., Bernardes, A. P., Berthoumieux, E., Billowes, J., Borge, M. J. G., Bosnar, D., Brown, A., Brugger, M., Busso, M., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Castelluccio, D. M., Catherall, R., Cerutti, F., Chen, Y. H., Chiaveri, E., Corts, G., Cortes-Giraldo, M. A., Cristallo, S., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dorsival, A., Dupont, E., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Ferreira, P., Furman, W., Ganesan, S., Garca-Rios, A., Gilardoni, S., Glodariu, T., Gobel, K., Goncalves, I. F., Gonzalez-Romero, E., Goodacre, T. D., Griesmayer, E., Guerrero, C., Gunsing, F., Harada, H., Heftrich, T., Heyse, J., Jenkins, D. G., Jericha, E., Johnston, K., Kadi, Y., Kalamara, A., Katabuchi, T., Kavrigin, P., Kimura, A., Kivel, N., Kohester, U., Kokkoris, M., Krticka, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer-Woods, C., Leeb, H., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J., Losito, R., Macina, D., Marganiec, J., Marsh, B., Martinez, T., Martins Correia, J. G., Masi, A., Massimi, C., Mastinu, P., Matteucci, F., Mazzone, A., Mendoza, E., Milazzo, P. M., Mingrone, F., Mirea, M., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Piersanti, L., Piscopo, M., Plompen, A., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rajeev, K., Rauscher, T., Reifarth, R., Riego-Perez, A., Rothe, S., Rout, P., Rubbia, C., Ryan, J., Sabate-Gilarte, M., Saxena, A., Schell, J., Schillebeeckx, P., Schmidt, S., Sedyshev, P., Seiffert, C., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Stora, T., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weigand, M., Weiss, C., Wolf, C., Woods, P. J., Wright, T., Zugec, P., Formicola, Alba, Junker, Matthias, Gialanella, Lucio, Imbriani, Gianluca, Damone L.A., Barbagallo M., Mastromarco M., Mengoni A., Colonna N., Cosentino L., Maugeri E.A., Heinitz S., Schumann D., Dressler R., Kappeler F., Finocchiaro P., Andrzejewski J., Perkowski J., Gawlik A., Aberle O., Altstadt S., Ayranov M., Audouin L., Bacak M., Balibrea-Correa J., Ballof J., Bcares V., Becvar F., Beinrucker C., Bellia G., Bernardes A.P., Berthoumieux E., Billowes J., Borge M.J.G., Bosnar D., Brown A., Brugger M., Busso M., Caamano M., Calvino F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Castelluccio D.M., Catherall R., Cerutti F., Chen Y.H., Chiaveri E., Corts G., Cortes-Giraldo M.A., Cristallo S., Diakaki M., Dietz M., Domingo-Pardo C., Dorsival A., Dupont E., Duran I., Fernandez-Dominguez B., Ferrari A., Ferreira P., Furman W., Ganesan S., Garca-Rios A., Gilardoni S., Glodariu T., Gobel K., Goncalves I.F., Gonzalez-Romero E., Goodacre T.D., Griesmayer E., Guerrero C., Gunsing F., Harada H., Heftrich T., Heyse J., Jenkins D.G., Jericha E., Johnston K., Kadi Y., Kalamara A., Katabuchi T., Kavrigin P., Kimura A., Kivel N., Kohester U., Kokkoris M., Krticka M., Kurtulgil D., Leal-Cidoncha E., Lederer-Woods C., Leeb H., Lerendegui-Marco J., Lo Meo S., Lonsdale S.J., Losito R., Macina D., Marganiec J., Marsh B., Martinez T., Martins Correia J.G., Masi A., Massimi C., Mastinu P., Matteucci F., Mazzone A., Mendoza E., Milazzo P.M., Mingrone F., Mirea M., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Piersanti L., Piscopo M., Plompen A., Porras I., Praena J., Quesada J.M., Radeck D., Rajeev K., Rauscher T., Reifarth R., Riego-Perez A., Rothe S., Rout P., Rubbia C., Ryan J., Sabate-Gilarte M., Saxena A., Schell J., Schillebeeckx P., Schmidt S., Sedyshev P., Seiffert C., Smith A.G., Sosnin N.V., Stamatopoulos A., Stora T., Tagliente G., Tain J.L., Tarifeno-Saldivia A., Tassan-Got L., Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Warren S., Weigand M., Weiss C., Wolf C., Woods P.J., Wright T., and Zugec P.

Subjects
Physics, Large Hadron Collider, 010308 nuclear & particles physics, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, BBN, neutron, Nuclear physics, Stars, Cross section (physics), chemistry, Big Bang nucleosynthesis, 7Be(n, p)7Li, Cosmological Lithium Problem, n_TOF, 0103 physical sciences, Nuclear astrophysics, Lithium, Halo, 010306 general physics, Beam (structure)
Abstract

International audience; One of the most puzzling problems in Nuclear Astrophysics is the “Cosmological Lithium Problem”, i.e the discrepancy between the primordial abundance of$^{7}$ Li observed in metal poor halo stars (Asplund et al. in Astrophys J 644:229–259, 2006, [1]), and the one predicted by Big Bang Nucleosynthesis (BBN). One of the reactions that could have an impact on the problem is$^{7}$ Be(n,p)$^{7}$ Li. Despite of the importance of this reaction in BBN, the cross-section has never been directly measured at the energies of interest for BBN. Taking advantage of the innovative features of the second experimental area at the n $\_$ TOF facility at CERN (Sabate-Gilarte et al. in Eur Phys J A 53:210, 2017, [2], Weiss et al. in NIMA 799:90, 2015, [3]), an accurate measurement of$^{7}$ Be(n,p) cross section has been recently performed at n $\_$ TOF, with a pure$^{7}$ Be target produced by implantation of a$^{7}$ Be beam at ISOLDE. The mesurement started in April 2016 and lasted for two months. The experimental procedure, the setup used in the measurement and the results obtained so far will be here presented.

Published
2018

36. Measurement and resonance analysis of the S33(n,α)Si30 cross section at the CERN n_TOF facility in the energy region from 10 to 300 keV

Author

C. Carrapiço, Tanja Heftrich, G. Cortes, A. Riego-Perez, D. Tarrío, M. S. Robles, Jeri Kroll, Ignacio Porras, M. Mastromarco, J. Lerendegui-Marco, A. Mengoni, M. P. W. Chin, M. B. Gomez-Hornillos, J. Andrzejewski, I. F. Gonçalves, Fabio Belloni, Javier Praena, Massimo Barbagallo, R. Sarmento, V. Ketlerov, Anton Wallner, Ariel Tarifeño-Saldivia, C. Paradela, P. Vaz, D. Cano-Ott, M. A. Cortés-Giraldo, L. Audouin, F. Bečvář, V. Khryachkov, C. Weiss, Srinivasan Ganesan, M. Diakaki, P. M. Milazzo, E. Chiaveri, E. Mendoza, C. Lampoudis, P. F. Mastinu, V. Furman, T. J. Wright, Roberto Losito, A. Pavlik, F. Gunsing, Tatsuya Katabuchi, A. Ventura, Peter Schillebeeckx, C. Domingo-Pardo, Claudia Lederer-Woods, M. Sabaté-Gilarte, Cristian Massimi, Damir Bosnar, A. Manousos, Y. Kadi, V. Bécares, E. Leal-Cidoncha, C. Eleftheriadis, Rene Reifarth, Stefan Schmidt, R. Vlastou, E. Berthoumieux, M. Kokkoris, Thomas Rauscher, J. Marganiec, Vittorio Boccone, J. M. Quesada, D. G. Jenkins, M. Mirea, P. V. Sedyshev, L. Tassan-Got, A. Mallick, G. Vannini, D. Karadimos, Petar Žugec, Willy Mondelaers, F. Calviño, H. Leeb, A. K. Saxena, Christoph Langer, J. Perkowski, A. Hernández-Prieto, Arnaud Ferrari, E. González-Romero, J. Billowes, Mario Weigand, Kathrin Göbel, A. R. García, Rugard Dressler, Jan Heyse, A. Tsinganis, F. Cerutti, M. J. Vermeulen, M. Brugger, Nicola Colonna, E. Jericha, L.S. Leong, S. Valenta, Dorothea Schumann, Vasilis Vlachoudis, J. A. Ryan, Marco Calviani, S. Altstadt, K. Fraval, M. Dietz, Carlos Guerrero, G. Giubrone, G. Tagliente, J. L. Tain, F. Käppeler, Niko Kivel, V. Variale, A. Goverdovski, P. E. Koehler, F. Mingrone, C. Rubbia, I. Duran, M. Krtička, T. Martinez, T. Ware, E. Griesmayer, and A. J. M. Plompen

Subjects
Physics, Nuclear reaction, Large Hadron Collider, 010308 nuclear & particles physics, Resolution (electron density), Resonance, MicroMegas detector, 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, 010306 general physics
Abstract

The 33S(n, α)30Si cross section has been measured at the neutron time-of-flight (n_TOF) facility at CERN in the neutron energy range from 10 to 300 keV relative to the 10B(n, α)7Li cross-section standard. Both reactions were measured simultaneously with a set of micromegas detectors. The flight path of 185 m has allowed us to obtain the cross section with high-energy resolution. An accurate description of the resonances has been performed by means of the multilevel multichannel R-matrix code SAMMY. The results show a significantly higher area of the biggest resonance (13.45 keV) than the unique high-resolution (n, α) measurement. The new parametrization of the 13.45-keV resonance is similar to that of the unique transmission measurement. This resonance is a matter of research in neutron-capture therapy. The 33S(n, α)30Si cross section has been studied in previous works because of its role in the production of 36S in stars, which is currently overproduced in stellar models compared to observations.

Published
2018

37. Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Author

J. Lerendegui-Marco, Carlos Guerrero, S. Andriamonje, I. Dillmann, Jan Heyse, P. E. Koehler, E. Leal-Cidoncha, C. Eleftheriadis, S. Altstadt, I. F. Gonçalves, E. Chiaveri, P. F. Mastinu, Thomas Rauscher, Fabio Belloni, C. Weiss, G. Tagliente, M. Mirea, S. Heinitz, V. Bécares, D. Karadimos, M. Mastromarco, P. V. Sedyshev, A. Mengoni, M. S. Robles, D. López, Massimo Barbagallo, Roberto Losito, N. Colonna, A. K. Saxena, F. Mingrone, C. Lederer, I. Duran, Tatsuya Katabuchi, A. Ventura, M. P. W. Chin, V. Ketlerov, F. Roman, Srinivasan Ganesan, F. Calviño, H. Leeb, C. Carrapiço, Arnaud Ferrari, C. Paradela, Anton Wallner, Ariel Tarifeño-Saldivia, M. B. Gomez-Hornillos, B. Berthier, F. Cerutti, J. Billowes, P. Gurusamy, L. Audouin, J. Balibrea, A. Goverdovski, M. J. Vermeulen, V. Khryachkov, A. Tsinganis, J. Andrzejewski, Tanja Heftrich, A. Hernández-Prieto, F. Bečvář, E. González, Jeri Kroll, P. Vaz, S. Valenta, J. Perkowski, L.S. Leong, A. Riego-Perez, P. M. Milazzo, D. Cano-Ott, A. R. García, Marco Calviani, T. Ware, Vasilis Vlachoudis, K. Fraval, R. Sarmento, M. Brugger, F. Gramegna, M. Kokkoris, E. Mendoza, E. Griesmayer, A. J. M. Plompen, M. Krtička, M. Diakaki, Javier Praena, F. Käppeler, V. Variale, Peter Schillebeeckx, N. Dzysiuk, Rene Reifarth, T. Martinez, Roberto Versaci, Willy Mondelaers, Christoph Langer, G. Giubrone, Stefan Schmidt, C. Lampoudis, A. Pavlik, Y. Kadi, C. Rubbia, Mario Weigand, A. Manousos, C. Domingo-Pardo, J. M. Quesada, L. Tassan-Got, E. Jericha, J. Marganiec, M. Sabaté-Gilarte, Dorothea Schumann, J. A. Ryan, F. Gunsing, J. L. Tain, D. Bosnar, Cristian Massimi, R. Vlastou, E. Berthoumieux, M. A. Cortés-Giraldo, Petar Žugec, G. Cortes, D. Tarrío, V. Furman, T. J. Wright, G. Vannini, D. G. Jenkins, and M. Licata

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, Resonance, 01 natural sciences, 7. Clean energy, Neutron temperature, Calorimeter, Nuclear physics, Cross section (physics), Neutron capture, 0103 physical sciences, Neutron cross section, Neutron, 010306 general physics
Abstract

The Am241(n,γ) cross section has been measured at the n-TOF facility at CERN with the n-TOF BaF2 Total Absorption Calorimeter in the energy range between 0.2 eV and 10 keV. Our results are analyzed as resolved resonances up to 700 eV, allowing a more detailed description of the cross section than in the current evaluations, which contain resolved resonances only up to 150-160 eV. The cross section in the unresolved resonance region is perfectly consistent with the predictions based on the average resonance parameters deduced from the resolved resonances, thus obtaining a consistent description of the cross section in the full neutron energy range under study. Below 20 eV, our results are in reasonable agreement with JEFF-3.2 as well as with the most recent direct measurements of the resonance integral, and differ up to 20-30% with other experimental data. Between 20 eV and 1 keV, the disagreement with other experimental data and evaluations gradually decreases, in general, with the neutron energy. Above 1 keV, we find compatible results with previously existing values.

Published
2018

38. Strong neutron pairing in core+4n nuclei

Author

S. Beceiro-Novo, R. Thies, Jorge Machado, Andreas Martin Heinz, Tanja Heftrich, L. M. Fraile, A. Estrade, Marina Petri, T. Le Bleis, D. Cortina-Gil, L. Atar, T. Kröll, A. Knyazev, M. A. Najafi, G. L. Wilson, D. Rossi, Kai Zuber, A. Movsesyan, Z. Elekes, Simon Lindberg, I. Syndikus, P. Díaz Fernández, K. Göbel, Catherine Rigollet, Ángel Perea, R. Crespo, F. Farinon, J. Kahlbow, V. Volkov, M. Caamaño, W. N. Catford, A. Ignatov, S. Pietri, Carlos A. Bertulani, V. Panin, C. Langer, A. Kelic-Heil, O. Sorlin, Stefanos Paschalis, J. M. Boillos, Enrique Casarejos, J. Hagdahl, Iris Dillmann, M Vandebrouck, O. Ershova, K. Boretzky, A. Henriques, Roy Crawford Lemmon, J. S. Winfield, J. Benlliure, M. Labiche, Vladimir Avdeichikov, Enrique Nácher, H. Weick, Thomas Nilsson, F. Wamers, Rituparna Kanungo, M. Holl, C. Caesar, P. Velho, Håkan T Johansson, G. Ribeiro, Pavel Golubev, F. M. Marqués, M. Heine, Andreas Zilges, Hans Geissel, J. Enders, D. Galaviz, Daniel Bemmerer, Deniz Savran, Marielle Chartier, María José García Borge, Haik Simon, M. Freer, J. Taylor, Nasser Kalantar-Nayestanaki, Olof Tengblad, C. Wheldon, C. Nociforo, A. Revel, H. Alvarez-Pol, Joakim Cederkäll, Thomas Aumann, Rene Reifarth, L. Chulkov, J. Marganiec, Mikhail V. Zhukov, D. Yakorev, Björn Jonson, M. Röder, Philip Woods, R. Plag, U. Datta Pramanik, Andreas Wagner, R. Gernhäuser, E. Cravo, Y. Togano, H. Scheit, N. Kurz, M. Heil, Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), R3B, Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Aucun, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Molecular physics, Pairing, 0103 physical sciences, Neutron, Física nuclear, Nuclear Experiment (nucl-ex), [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nucleon, Nuclear Experiment, R3B radioactive beams nuclear structure neutron-rich Coulomb dissociation
Abstract

6 pags., 4 figs., The emission of neutron pairs from the neutron-rich N = 12 isotones C-18 and O-20 has been studied by high-energy nucleon knockout from N-19 and O-21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N-19(-1p)18C*-> C-16 + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a C-14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O-21(-1n)O-20*-> O-18 + n + n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O-16 core and reduces the number of pairs., This work was supported by the German Federal Ministry for Education and Research (BMBF Project No. 05P15RDFN1), and through the GSI-TU Darmstadt cooperation agreement. C. A. Bertulani acknowledges support by U.S. Department of Energy Grant No. DE-FG02-08ER41533 and U.S. National Science Foundation Grant No. 1415656.

Published
2018

39. Comparison of electromagnetic and nuclear dissociation of Ne-17

Author

H. O. U. Fynbo, Deniz Savran, F. Aksouh, Christoph Langer, D. Cortina-Gil, J. Hoffman, Mattias Lantz, Michael Heil, O. Kiselev, W. Ott, Achim Richter, Thomas Aumann, K. Riisager, R. Kulessa, Björn Jonson, C. Lehr, L. M. Fraile, Dieter H. H. Hoffmann, Ángel Perea, J. Marganiec, Carlos A. Bertulani, C. Nociforo, Marielle Chartier, C. Karagiannis, Thomas Nilsson, Stefan Typel, V. Panin, F. Wamers, Y. Aksyutina, Hans Geissel, K. Sümmerer, Ralf Plag, H. Emling, Stefanos Paschalis, S. Beceiro-Novo, N. Kurz, O. Ershova, K. Mahata, Roy Crawford Lemmon, C. Wimmer, J. V. Kratz, D. Galaviz, A. Chatillon, Herbert A. Simon, T. Le Bleis, Olof Tengblad, Helmut Weick, Håkan T Johansson, H. Alvarez-Pol, C. Muntz, Michael Wiescher, Yu. A. Litvinov, D. M. Rossi, C. Rodriguez-Tajes, Joachim Stroth, M. J. G. Borge, G. Schrieder, K. Boretzky, Rene Reifarth, L. Chulkov, Department of Energy (US), National Science Foundation (US), German Research Foundation, Federal Ministry of Education and Research (Germany), European Money Markets Institute, Helmholtz International Center for FAIR, Technische Universität Darmstadt, and Ministerio de Economía y Competitividad (España)

Subjects
Physics, COLLISIONS, Internal energy, 010308 nuclear & particles physics, 01 natural sciences, 7. Clean energy, STATE, Dissociation (chemistry), Coincidence, CAPTURE, Reaction rate, medicine.anatomical_structure, Fragmentation (mass spectrometry), 0103 physical sciences, medicine, Halo, Atomic physics, 010306 general physics, Ground state, DECAY, Nucleus
Abstract

8 pags., 10 figs., 3 tabs., The Borromean drip-line nucleus Ne-17 has been suggested to possess a two-proton halo structure in its ground state. In the astrophysical rp-process, where the two-proton capture reaction O-15(2p,gamma) Ne-17 plays an important role, the calculated reaction rate differs by several orders of magnitude between different theoretical approaches. To add to the understanding of the Ne-17 structure we have studied nuclear and electromagnetic dissociation. A 500 MeV/u Ne-17 beam was directed toward lead, carbon, and polyethylene targets. Oxygen isotopes in the final state were measured in coincidence with one or two protons. Different reaction branches in the dissociation of Ne-17 were disentangled. The relative populations of s and d states in F-16 were determined for light and heavy targets. The differential cross section for electromagnetic dissociation (EMD) shows a continuous internal energy spectrum in the three-body system O-15 + 2p. The Ne-17 EMD data were compared to current theoretical models. None of them, however, yields satisfactory agreement with the experimental data presented here. These new data may facilitate future development of adequate models for description of the fragmentation process., This project is supported by NAVI, GSI-TU Darmstadt cooperation, HIC for FAIR, EMMI, and BMBF and from DFG through Grant No. SFB1245 and from BMBF via Project No. 05P15RDFN1, and from the Spanish Ministry by research grant FPA2015-64969-P. C.A.B. acknowledges support by the US DOE Grant No. DE-FG02-08ER41533 and the US NSF Grant No. 1415656.

Published
2018

40. Quasifree ( p,pN ) scattering of light neutron-rich nuclei near N=14

Author

Roy Crawford Lemmon, M. Röder, Rituparna Kanungo, P. Cabanelas, M. Heil, S. Pietri, Hans Geissel, E. Y. Nikolskii, A. Movsesyan, J. Marganiec, O. Ershova, J. Enders, N. Kurz, V. Volkov, K. Boretzky, Iris Dillmann, Stefanos Paschalis, H. Scheit, F. Farinon, A. Estrade, Vladimir Avdeichikov, R. Plag, G. L. Wilson, A. Najafi, L. M. Fraile, V. Panin, A. M. Moro, D. Jurčiukonis, Simon Lindberg, Catherine Rigollet, Kai Zuber, U. Datta Pramanik, A. Henriques, J. Benlliure, F. Wamers, D. Yakorev, Carlos A. Bertulani, María José García Borge, J. S. Winfield, C. Langer, Andreas Zilges, I. Syndikus, A. Kelic-Heil, A. Deltuva, Thomas Nilsson, T. Le Bleis, M. Heine, G. Ribeiro, E. Cravo, D. Cortina-Gil, L. Atar, Nasser Kalantar-Nayestanaki, Mikhail V. Zhukov, Daniel Bemmerer, C. Wheldon, Marine Vandebrouck, D. Galaviz, Thomas Aumann, Y. Togano, Andreas Martin Heinz, O. Sorlin, Björn Jonson, M. Holl, T. Kröll, Andreas Wagner, Joakim Cederkäll, S. Beceiro-Novo, Ángel Perea, Enrique Nácher, Z. Elekes, H. Weick, B. Fernández-Domínguez, Philip Woods, Håkan T Johansson, K. Göbel, R. Gernhäuser, B. Pietras, Deniz Savran, Pavel Golubev, Haik Simon, M. Freer, Olof Tengblad, Rene Reifarth, Tanja Heftrich, C. Nociforo, W. N. Catford, D. Rossi, H. Alvarez-Pol, A. Ignatov, L. Chulkov, C. Caesar, J. Taylor, P. Velho, R. Crespo, A. Knyazev, R. Thies, Jorge Machado, Marina Petri, J. M. Boillos, J. Hagdahl, A. Hufnagel, M. Labiche, P. Díaz Fernández, Marielle Chartier, M. Caamaño, and Enrique Casarejos

Subjects
Physics, Proton, Inverse kinematics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, Inverse, 01 natural sciences, Light scattering, Nuclear physics, Momentum, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The (RB)-B-3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C-12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p, pn) and (p, 2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N = 14 to N = 15. Method: The structure of the projectiles O-23, O-22, and N-21 has been studied simultaneously via (p, pn) and (p, 2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the (RB)-B-3-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p, pn) and (p, 2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p, pn) channels, indications of a change in the structure of these nuclei moving from N = 14 to N = 15 have been observed, i.e., from the 0d(5/2) shell to the 1s(1/2). This supports previous observations of a subshell closure at N = 14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.

Published
2018

41. Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Author

Tanja Heftrich, A. Mengoni, E. Leal-Cidoncha, Thomas Rauscher, A. Riego-Perez, E. González-Romero, L. Audouin, V. Bécares, V. Ketlerov, G. Vannini, A. G. Smith, N. Patronis, A. K. Saxena, I. Duran, M. Mirea, A. R. García, Arnaud Ferrari, D. M. Castelluccio, M. Brugger, Damir Bosnar, Y. Kadi, M. Caamaño, C. Beinrucker, S. Valenta, Rugard Dressler, Marco Calviani, C. Weiss, A. Kimura, E. Chiaveri, Rene Reifarth, Luigi Cosentino, C. Lederer, P. F. Mastinu, A. Tsinganis, F. Calviño, P. Kavrigin, Jan Heyse, Emilio Andrea Maugeri, Stefan Schmidt, S. Montesano, G. Tagliente, A. Oprea, D. G. Jenkins, H. Leeb, Nicola Colonna, B. Fernández-Domínguez, F. Käppeler, Vasilis Vlachoudis, J. M. Quesada, L. Tassan-Got, J. Perkowski, J. Marganiec, R. Cardella, O. Aberle, M. A. Cortés-Giraldo, A. Pavlik, M. Bacak, C. Domingo-Pardo, M. Sabaté-Gilarte, J. I. Porras, T. Glodariu, Roberto Losito, A. Stamatopoulos, M. Kokkoris, J. Andrzejewski, Ralf Nolte, G. Cortes, P. J. Woods, Mario Barbagallo, V. Khryachkov, P. M. Milazzo, K. Rajeev, E. Griesmayer, J. Billowes, S. Warren, L. A. Damone, Javier Praena, S. Lo Meo, Hideo Harada, V. Variale, Francesca Matteucci, M. Krtička, Arnd R. Junghans, D. Macina, P. Vaz, Carlos Guerrero, T. Martinez, Mario Weigand, A. Casanovas, D. Cano-Ott, M. Diakaki, M. Mastromarco, Y. H. Chen, S. J. Lonsdale, Ariel Tarifeño-Saldivia, P. C. Rout, K. Göbel, F. Cerutti, Anton Wallner, F. Mingrone, J. Balibrea, M. Dietz, F. Bečvář, F. Gunsing, C. Wolf, E. Mendoza, A. Goverdovski, S. Heinitz, Peter Schillebeeckx, Cristian Massimi, S. Barros, E. Jericha, Paolo Finocchiaro, Dorothea Schumann, P. Ferreira, Tatsuya Katabuchi, A. Ventura, J. A. Ryan, J. Lerendegui-Marco, P. V. Sedyshev, I. F. Gonçalves, E. Dupont, J. L. Tain, Niko Kivel, C. Rubbia, A. Gawlik, V. Furman, Klaus Eberhardt, T. J. Wright, Petar Žugec, R. Vlastou, E. Berthoumieux, and A. Musumarra

Subjects
Physics, Nuclear fuel, Fissile material, 010308 nuclear & particles physics, chemistry.chemical_element, Uranium, 01 natural sciences, 7. Clean energy, Spent nuclear fuel, Neutron temperature, Nuclear physics, Neutron capture, chemistry, 13. Climate action, 0103 physical sciences, Neutron, 010306 general physics, MOX fuel
Abstract

The spent fuel of current nuclear reactors contains fissile plutonium isotopes that can be combined with uranium to make mixed oxide (MOX) fuel. In this way the Pu from spent fuel is used in a new reactor cycle, contributing to the long-term sustainability of nuclear energy. However, an extensive use of MOX fuels, in particular in fast reactors, requires more accurate capture and fission cross sections for some Pu isotopes. In the case of Pu242 there are sizable discrepancies among the existing capture cross-section measurements included in the evaluations (all from the 1970s) resulting in an uncertainty as high as 35% in the fast energy region. Moreover, postirradiation experiments evaluated with JEFF-3.1 indicate an overestimation of 14% in the capture cross section in the fast neutron energy region. In this context, the Nuclear Energy Agency (NEA) requested an accuracy of 8% in this cross section in the energy region between 500 meV and 500 keV. This paper presents a new time-of-flight capture measurement on Pu242 carried out at n-TOF-EAR1 (CERN), focusing on the analysis and statistical properties of the resonance region, below 4 keV. The Pu242(n,γ) reaction on a sample containing 95(4) mg enriched to 99.959% was measured with an array of four C6D6 detectors and applying the total energy detection technique. The high neutron energy resolution of n-TOF-EAR1 and the good statistics accumulated have allowed us to extend the resonance analysis up to 4 keV, obtaining new individual and average resonance parameters from a capture cross section featuring a systematic uncertainty of 5%, fulfilling the request of the NEA.

Published
2018

42. Quasifree ( p , 2p ) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Author

Rene Reifarth, J. Kahlbow, E. Y. Nikolskii, R. Thies, Jorge Machado, M. Heine, A. Estrade, Marina Petri, G. Ribeiro, J. Taylor, Daniel Bemmerer, M. A. Najafi, Haik Simon, M. Freer, Olof Tengblad, Enrique Casarejos, H. Alvarez-Pol, Kai Zuber, F. Farinon, C. Nociforo, D. Rossi, Nasser Kalantar-Nayestanaki, C. Wheldon, Thomas Aumann, K. Boretzky, L. Chulkov, Andreas Martin Heinz, C. Caesar, Vladimir Avdeichikov, Tanja Heftrich, J. M. Boillos, J. Hagdahl, V. Panin, D. Galaviz Redondo, Ángel Perea, T. Kröll, Joakim Cederkäll, A. Ignatov, Carlos A. Bertulani, N. Kurz, A. Hufnagel, M. Labiche, S. Pietri, V. Volkov, P. Díaz Fernández, Mikhail V. Zhukov, G. L. Wilson, Simon Lindberg, Carlo Barbieri, I. Syndikus, J. Benlliure, F. Wamers, M. Heil, Marine Vandebrouck, Catherine Rigollet, M. Caamaño, Enrique Nácher, H. Weick, S. Beceiro-Novo, C. Langer, O. Ershova, A. Kelic-Heil, P. Velho, A. Henriques, J. S. Winfield, Thomas Nilsson, A. Knyazev, E. Cravo, Håkan T Johansson, R. Crespo, María José García Borge, Pavel Golubev, O. Sorlin, H. Scheit, Marielle Chartier, M. Holl, Deniz Savran, I. Dillmann, Stefanos Paschalis, D. Yakorev, Y. Togano, J. Marganiec-Gałązka, T. Le Bleis, D. Cortina-Gil, Rituparna Kanungo, Hans Geissel, L. Atar, A. Movsesyan, L. M. Fraile, Björn Jonson, Philip Woods, Andreas Wagner, R. Gernhäuser, Andreas Zilges, J. Enders, R. Lemmon, M. Röder, Z. Elekes, K. Göbel, R. Plag, and W. N. Catford

Subjects
Physics, Range (particle radiation), 010308 nuclear & particles physics, Eikonal equation, media_common.quotation_subject, Nuclear Theory, Ab initio, General Physics and Astronomy, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Asymmetry, Oxygen, Isotopes of oxygen, Nuclear physics, chemistry, Isospin, 0103 physical sciences, Particle, Nuclear Experiment, 010306 general physics, media_common
Abstract

Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type OA(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

Published
2018

43. Experimental setup and procedure for the measurement of the $^7$Be(n,p)$^7$Li reaction at n_TOF

Author

A. Oprea, M. Krtička, J. Heyse, P. Ferreira, G. Bellia, T. Martinez, A. Musumarra, G. Cortes, M. Sabaté-Gilarte, G. Tagliente, J. Billowes, M. S. Robles, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. Diakaki, G. Vannini, Alexandru Negret, Juliana Schell, F. Käppeler, R. Nolte, Y. H. Chen, S. Heinitz, Karl Johnston, F. Mingrone, J. Andrzejewski, Carlo Rubbia, V. Vlachoudis, A. Casanovas, M. Bacak, Alfredo Ferrari, E. A. Maugeri, S. Warren, V. Variale, D. Radeck, E. Berthoumieux, M. Mastromarco, C. Lederer, Carlos Guerrero, K. Göbel, E. Mendoza, P. Kavrigin, J. Lerendegui-Marco, A. Manna, V. Furman, Anton Wallner, I. F. Gonçalves, N. V. Sosnin, N. Kivel, A. Kalamara, J. Balibrea, F. Gunsing, E. Griesmayer, L. A. Damone, E. Jericha, T. Glodariu, Paolo Finocchiaro, Annamaria Mazzone, Petar Žugec, Nicola Colonna, A. Kimura, T. Wright, J. A. Ryan, A. Masi, E. Dupont, P. M. Milazzo, L. Audouin, D. G. Jenkins, A. S. Brown, J. Marganiec, I. Duran, Maurizio Piscopo, L. Cosentino, P. F. Mastinu, I. Porras, A. Saxena, Cristian Massimi, R. Dressler, M. A. Cortés-Giraldo, Deniz Kurtulgil, P. Schillebeeckx, P. V. Sedyshev, Mario Barbagallo, D. Schumann, Hideo Harada, E. Leal-Cidoncha, A. Gawlik, C. Weiss, R. Vlastou, Thomas Rauscher, B. Fernández-Domínguez, Damir Bosnar, Y. Kadi, N. Patronis, S. Valenta, E. González-Romero, Marco Calviani, A. G. Smith, M. Dietz, Philip Woods, J. L. Tain, A. R. García, A. Stamatopoulos, M. Kokkoris, F. Bečvář, Alfio Pappalardo, Alberto Mengoni, F. Calviño, H. Leeb, D. Macina, J. Perkowski, O. Aberle, P. Vaz, Alberto Ventura, Rene Reifarth, E. Chiaveri, J. M. Quesada, L. Tassan-Got, D. Cano-Ott, Sergio Cristallo, A. Pavlik, C. Domingo-Pardo, S. Amaducci, J. G. Martins-Correia, Javier Praena, S. Lo Meo, M. Caamaño, F. Cerutti, Simone Gilardoni, R. Cardella, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire AIM, Université Paris Diderot - Paris 7 ( UPD7 ) -Centre d'Etudes de Saclay, Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Mengoni, A., Lo Meo, S., Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Barbagallo, M., Andrzejewski, J., Mastromarco, M., Perkowski, J., Damone, L.A., Gawlik, A., Cosentino, L., Finocchiaro, P., Maugeri, E.A., Mazzone, A., Dressler, R., Heinitz, S., Kivel, N., Schumann, D., Colonna, N., Aberle, O., Amaducci, S., Audouin, L., Bacak, M., Balibrea, J., Bečvář, F., Bellia, G., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Caamaño, M., Calviño, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y.H., Chiaveri, E., Cortés, G., Cortés-Giraldo, M.A., Cristallo, S., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dupont, E., Durán, I., Fernández-Domínguez, B., Ferrari, A., Ferreira, P., Furman, V., Göbel, K., García, A.R., Gilardoni, S., Glodariu, T., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Harada, H., Heyse, J., Jenkins, D.G., Jericha, E., Johnston, K., Käppeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kokkoris, M., Krtička, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Leeb, H., Lerendegui-Marco, J., Lonsdale, S.J., Macina, D., Manna, A., Marganiec, J., Martínez, T., Martins-Correia, J.G., Masi, A., Massimi, C., Mastinu, P., Mendoza, E., Milazzo, P.M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Pappalardo, A.D., Patronis, N., Pavlik, A., Piscopo, M., Porras, I., Praena, J., Quesada, J.M., Radeck, D., Rauscher, T., Reifarth, R., Robles, M.S., Rubbia, C., Ryan, J.A., Sabaté-Gilarte, M., Saxena, A., Schell, J., Schillebeeckx, P., Sedyshev, P., Smith, A.G., Sosnin, N.V., Stamatopoulos, A., Tagliente, G., Tain, J.L., Tarifeño-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P.J., Wright, T., Žugec, P., Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Physics - Instrumentation and Detectors, Nuclear physics, OUTLOOK, 01 natural sciences, 7. Clean energy, Particle identification, p) 7Li reaction, CERN, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation, physics.ins-det, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 7Be(n,p)7 Li reaction, 7Be(n,p) 7Li reaction, Big bang nucleosynthesis, Cosmological Lithium problem, n_TOF spallation neutron source, Nuclear and High Energy Physics, Instrumentation, Physics, Large Hadron Collider, Cross section, 7Be(n, Big bang nucleosynthesis, Detector, Instrumentation and Detectors (physics.ins-det), Charged particle, PRIRODNE ZNANOSTI. Fizika, Cosmological Lithium problem, Big bang nucleosynthesis, 7Be(n, p)7Li reaction, n_TOF spallation neutron source, Cardinal point, Big bang nucleosynthesi, Física nuclear, p) 7 Li reaction, CROSS-SECTION, Cosmological Lithium problem, Spallation Neutron Source, n_TOF spallation neutron source, 7Be(n,p) 7Li reaction, Nuclear and High Energy Physics, nTOF, FOS: Physical sciences, Be-7(n,p)Li-7 reaction, 7Be(n,p)7Li reaction, 0103 physical sciences, Neutron, FACILITY, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear and High Energy Physic, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, p)7Li reaction, Neutron radiation, NATURAL SCIENCES. Physics, 7 Be(n, NEUTRON
Abstract

Following the completion of the second neutron beam line and the related experimental area (EAR2) at the n_TOF spallation neutron source at CERN, several experiments were planned and performed. The high instantaneous neutron flux available in EAR2 allows to investigate neutron indiced reactions with charged particles in the exit channel even employing targets made out of small amounts of short-lived radioactive isotopes. After the successful measurement of the 7Be(n,{\alpha}){\alpha} cross section, the 7Be(n,p)7Li reaction was studied in order to provide still missing cross section data of relevance for Big Bang Nucleosynthesis (BBN), in an attempt to find a solution to the cosmological Lithium abundance problem. This paper describes the experimental setup employed in such a measurement and its characterization., The authors are grateful to Carmelo Marchetta (INFN-LNS) for the production of the 6LiF test target. This research was partially funded by the European Atomic Energy Community (Euratom) Seventh Framework Programme FP7/2007- 2011 under the Project CHANDA (Grant No. 605203). We acknowledge the support of the Narodowe Centrum Nauki (NCN) under the grant UMO-2012/04/M/ST2/00700-UMO-2016/22/M/ST2/00183, and of the Croatian Science Foundation under project HRZZ 1680.

Published
2018

44. The Nuclear astrophysics program at n_TOF (CERN)

Author

C. Massimi, E. Chiaveri, C. Rubbia, P. J. Woods, S. Warren, A. Casanovas, F. Mingrone, M. Sabaté-Gilarte, D. Bosnar, A. Oprea, J. M. Quesada, G. Vannini, E. González, J. A. Ryan, E. Berthoumieux, Sergio Cristallo, I. Porras, J. Perkowski, M. A. Cortés-Giraldo, Mario Barbagallo, G. Cortes, D. Kurtulgil, M. Kokkoris, M. S. Robles, A. Stamatopoulos, L. R. Dressler, M. Bacak, J. Kroll, P. Kavrigin, M. Krtička, C. Weiss, A. Pavlik, F. Gunsing, L. A. Damone, A. Ventura, J. Andrzejewski, A. Riego, T. Glodariu, V. Variale, J. L. Tain, E. Dupont, F. Käppeler, C. Lederer, C. Domingo-Pardo, J. Heyse, Christoph Langer, Dorothea Schumann, H. Leeb, D. Radeck, Ralf Nolte, P. Mastinu, V. Vlachoudis, L. Piersanti, M. Mastromarco, G. Tagliente, J. Marganiec, Y. H. Chen, R. Cardella, B. Fernández-Domínguez, S. Heinitz, D. Cano-Ott, A. Masi, V. Furman, A. S. Brown, P. Finocchiaro, E. Griesmayer, P. M. Milazzo, Anton Wallner, T. Wright, D. G. Jenkins, P. Schillebeeckx, Nicola Colonna, J. Balibrea, Cosentino, N. V. Sosnin, A. Negret, T. Martínez, S. Valenta, E. Jericha, P. Sedyshev, A. Hernandez-Prieto, E. Leal-Cidoncha, Petar Žugec, Simona Losito, E. A. Maugeri, Javier Praena, S. Lo Meo, A. Ferrari, L. Tassan-Got, A. Kalamara, Pedro G. Ferreira, A. Mazzone, L. Audouin, A. Tsinganis, M. Caamaño, I. Duran, Y. Kadi, A. Saxena, Hideo Harada, P. Vaz, D. Macina, Carlos Guerrero, S. Gilardoni, M. Mirea, A. G. Smith, N. Patronis, F. Cerutti, M. Diakaki, R. Vlastou, F. Calviño, Atsushi Kimura, R. Reifarth, J. Billowes, F. Bečvář, E. Mendoza, A. Musumarra, J. Lerendegui-Marco, I. F. Gonçalves, K. Göbel, Ariel Tarifeño-Saldivia, S. J. Lonsdale, O. Aberle, Giulia Clai, A. Gawlik, Thomas Rauscher, A. R. García, Marco Calviani, N. Kivel, A. Mengoni, A. Mallik, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Mengoni, A., Lo Meo, S., Clai, G., Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Colonna, N., La Cognata, M., Aberle, O., Andrzejewski, J., Audouin, L., Bacak, M., Balibrea, J., Barbagallo, M., Bečvář, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Caamaño, M., Calviño, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Cortés, G., Cortés-Giraldo, M. A., Cosentino, Null, Cristallo, S., Damone, L. A., Diakaki, M., Domingo-Pardo, C., Dressler, L. R., Dupont, E., Durán, I., Fernández-Domínguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Göbel, K., García, A. R., Gawlik, A., Gilardoni, S., Glodariu, T., Gonçalves, I. F., González, E., Griesmayer, E., Guerrero, C., Gunsing, F., Harada, H., Heinitz, S., Hernandez-Prieto, A., Heyse, J., Jenkins, D. G., Jericha, E., Käppeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Kokkoris, M., Kroll, J., Krtička, M., Kurtulgil, D., Langer, C., Leal-Cidoncha, E., Lederer, C., Lerendegui-Marco, J., Leeb, H., Lonsdale, S. J., Losito, S., Macina, D., Mallik, A., Marganiec, J., Martínez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mingrone, F., Milazzo, P. M., Mirea, M., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rauscher, T., Reifarth, R., Riego, A., Robles, M. S., Rubbia, C., Ryan, J. A., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sedyshev, P., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeño-Saldivia, A., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J., Wright, T., Žugec, P., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Nuclear reaction, Astrofísica, Astrophysics and Astronomy, Cross-section, nTOF, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 01 natural sciences, 7. Clean energy, n_TOF, nuclear astrophysics, CERN, Nuclear physics, Physics and Astronomy (all), Stellar nucleosynthesis, Big Bang nucleosynthesis, Nucleosynthesis, 0103 physical sciences, CERN, Nuclear astrophysics, Astrophysics::Solar and Stellar Astrophysics, Nuclear Physics - Experiment, Neutron induced nuclear reactions, 010306 general physics, Nuclear Experiment, Astrophysics::Galaxy Astrophysics, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Neutron capture, 13. Climate action, Neutron source, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Nucleosíntesi
Abstract

An important experimental program on Nuclear Astrophysics is being carried out at the n_TOF since several years, in order to address the still open issues in stellar and primordial nucleosynthesis. Several neutron capture reactions relevant to s-process nucleosynthesis have been measured so far, some of which on important branching point radioisotopes. Furthermore, the construction of a second experimental area has recently opened the way to challenging measurements of (n, charged particle) reactions on isotopes of short half-life. The Nuclear Astrophysics program of the n_TOF Collaboration is here described, with emphasis on recent results relevant for stellar nucleosynthesis, stellar neutron sources and primordial nucleosynthesis., We acknowledge the support by the Narodowe Centrum Nauki (NCN), under the Grant No. UMO-2012/04/M/ST2/00700.

Published
2018

45. Measurement of the U238(n,γ) cross section up to 80 keV with the Total Absorption Calorimeter at the CERN n_TOF facility

Author

M. P. W. Chin, F. Roman, A. R. García, M. Brugger, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, E. González-Romero, Rene Reifarth, F. Käppeler, M. S. Robles, G. Cortes, F. Gunsing, D. Tarrío, G. Tagliente, Furman, Cristian Massimi, P. Gurusamy, Srinivasan Ganesan, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, Javier Praena, D. Cano-Ott, M. Diakaki, M. Mirea, A. Manousos, G. Vannini, J. Marganiec, M. Krtička, F. Calviño, C. Carrapiço, H. Leeb, A. K. Saxena, T. Martinez, J. Perkowski, Tanja Heftrich, Tatsuya Katabuchi, A. Ventura, Arnaud Ferrari, J. Billowes, A. Riego-Perez, F. Cerutti, M. A. Cortés-Giraldo, Mario Weigand, E. Chiaveri, M. Kokkoris, P. Vaz, P. F. Mastinu, E. Jericha, Variale, N. Colonna, C. Weiss, C. Paradela, D. Bosnar, Dorothea Schumann, L. Audouin, J. A. Ryan, Massimo Barbagallo, T. J. Wright, Anton Wallner, Christoph Langer, Ketlerov, Khryachkov, A. Hernández-Prieto, S. Valenta, Petar Žugec, C. Lampoudis, A. Pavlik, Marco Calviani, C. Domingo-Pardo, M. Dietz, M. Sabaté-Gilarte, K. Fraval, Jeri Kroll, Roberto Losito, R. Sarmento, G. Giubrone, Y. Kadi, Bécares, A. Tsinganis, D. G. Jenkins, L.S. Leong, Ariel Tarifeño-Saldivia, J. Lerendegui-Marco, P. M. Milazzo, Carlos Guerrero, I. F. Gonçalves, Fabio Belloni, M. J. Vermeulen, P. V. Sedyshev, R. Vlastou, E. Berthoumieux, S. Altstadt, F. Bečvář, E. Mendoza, Peter Schillebeeckx, N. Dzysiuk, Roberto Versaci, P. E. Koehler, I. Duran, T. Ware, E. Griesmayer, J. L. Tain, C. Rubbia, Vlachoudis, M. B. Gomez-Hornillos, J. Andrzejewski, A. Goverdovski, F. Mingrone, C. Lederer, and A. Mengoni

Subjects
Physics, Background subtraction, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, 01 natural sciences, Neutron temperature, Calorimeter, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, 010306 general physics, Absorption (electromagnetic radiation)
Abstract

The radiative capture cross section of a highly pure (99.999%), 6.125(2) grams and 9.56(5) 10-4 atoms/barn areal density 238-U sample has been measured with the Total Absorption Calorimeter (TAC) in the 185 m flight path at the CERN neutron time-of-flight facility n_TOF. This measurement is in response to the NEA High Priority Request list, which demands an accuracy in this cross section of less than 3% below 25 keV. These data have undergone careful background subtraction, with special care being given to the background originating from neutrons scattered by the 238-U sample. Pileup and dead-time effects have been corrected for. The measured cross section covers an energy range between 0.2 eV and 80 keV, with an accuracy that varies with neutron energy, being better than 4% below 25 keV and reaching at most 6% at higher energies.

Published
2017

46. Effective proton-neutron interaction near the drip line from unbound states in F25,26

Author

R. Crespo, Hans Geissel, Ralf Plag, J. Benlliure, Jason D. Holt, H. Hergert, Marine Vandebrouck, Christoph Langer, J. M. Boillos, Z. Elekes, J. Hagdahl, T. Kröll, J. Taylor, J. S. Winfield, A. Kelic-Heil, C. Caesar, Björn Jonson, Rene Reifarth, Roman Gernhäuser, A. Ignatov, D. M. Rossi, D. Galaviz, Joachim Enders, L. Chulkov, Deniz Savran, Ángel Perea, A. Lepailleur, F. Farinon, M. Heine, M. A. Najafi, Mikhail V. Zhukov, Nasser Kalantar-Nayestanaki, Andreas Wagner, T. Le Bleis, J. Kahlbow, Daniel Bemmerer, R. Kanungo, P. Velho, E. Y. Nikolskii, O. Sorlin, C. Wheldon, Thomas Aumann, M. Caamaño, D. Cortina-Gil, Stefanos Paschalis, Andreas Martin Heinz, L. Atar, Iris Dillmann, C. Nociforo, A. Henriques, R. Thies, Jorge Machado, O. Ershova, V. Panin, Marina Petri, Joakim Cederkäll, M. Holl, E. Cravo, Thomas Nilsson, A. Estrade, V. Volkov, W. N. Catford, Olof Tengblad, Vladimir Avdeichikov, Martin Freer, Marielle Chartier, F. Wamers, Simon Lindberg, M. J. G. Borge, Kai Zuber, Kathrin Göbel, Enrique Nácher, M. Röder, U. Datta Pramanik, Catherine Rigollet, H. Alvarez-Pol, Julien Gibelin, K. Boretzky, Yasuhiro Togano, M. Heil, I. Syndikus, L. M. Fraile, P. Díaz Fernández, A. Knyazev, S. R. Stroberg, S. Beceiro-Novo, Achim Schwenk, Tanja Heftrich, A. Movsesyan, D. Yakorev, A. Hufnagel, J. Marganiec, Helmut Weick, Håkan T Johansson, H. Scheit, Pavel Golubev, F. M. Marqués, Andreas Zilges, M. Labiche, G. L. Wilson, F. de Oliveira Santos, Carlos A. Bertulani, G. Ribeiro, P. J. Woods, S. Pietri, Enrique Casarejos, N. Kurz, Scott Bogner, Herbert A. Simon, and Roy Crawford Lemmon

Subjects
Physics, 010308 nuclear & particles physics, Binding energy, Ab initio, Resonance, 7. Clean energy, 01 natural sciences, Atomic mass, 0103 physical sciences, Bound state, Nuclear force, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Multiplet
Abstract

Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing. Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton- neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of F-26.

Published
2017

47. First Measurement of $^{72}$Ge$(n,γ)$ at n_TOF

Author

R. Vlastou, D. Radeck, E. Berthoumieux, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, A. Mengoni, V. Furman, T. J. Wright, M. Mastromarco, J. Andrzejewski, M. Krtička, G. Cortes, A. Oprea, A. Musumarra, J. Lerendegui-Marco, E. Leal-Cidoncha, F. Bečvář, S. Warren, Anton Wallner, J. Balibrea, I. F. Gonçalves, T. Martinez, E. Jericha, Alexandru Negret, Javier Praena, S. Lo Meo, D. Bosnar, M. Bacak, Paolo Finocchiaro, F. Calviño, E. Mendoza, V. Variale, P. Kavrigin, A. Gawlik, A. Kimura, Thomas Rauscher, Dorothea Schumann, H. Leeb, G. Tagliente, J. A. Ryan, Claudia Lederer-Woods, Ralf Nolte, J. Perkowski, D. Kahl, Peter Schillebeeckx, B. Fernández-Domínguez, F. Käppeler, S. Heinitz, Y. H. Chen, Ignacio Porras, A. Stamatopoulos, O. Aberle, E. Griesmayer, A. Casanovas, Mario Barbagallo, F. Gunsing, Deniz Kurtulgil, Y. Kadi, T. Glodariu, E. González-Romero, F. Cerutti, L. Cosentino, P. V. Sedyshev, A. Masi, L. A. Damone, Cristian Massimi, D. G. Jenkins, Simone Gilardoni, A. R. García, Rugard Dressler, A. S. Brown, C. Rubbia, I. Duran, S. Valenta, R. Cardella, D. Cano-Ott, J. Marganiec, M. Diakaki, F. Mingrone, G. Vannini, D. Macina, Marco Calviani, M. A. Cortés-Giraldo, M. Sabateé-Gilarte, Carlos Guerrero, A. G. Smith, E. Chiaveri, P. M. Milazzo, Nicola Colonna, P. F. Mastinu, M. Dietz, L. Audouin, J. L. Tain, E. Dupont, R. Garg, M. Caamaño, Vasilis Vlachoudis, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Niko Kivel, Rene Reifarth, P. Vaz, Pedro G. Ferreira, Alberto Ventura, C. Weiss, J. M. Quesada, L. Tassan-Got, A. Pavlik, C. Domingo-Pardo, Hideo Harada, Kathrin Göbel, Jan Heyse, P. J. Woods, N. Patronis, A. K. Saxena, Arnaud Ferrari, J. Billowes, A. Kalamara, Emilio Andrea Maugeri, M. Kokkoris, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Dietz, M., Lederer-Woods, C., Aberle, O., Andrzejewski, J., Audouin, L., Bacak, M., Balibrea, J., Barbagallo, M., Bečvář, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Caamaño, M., Calviño, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortés, G., Cortés-Giraldo, M. A, Cosentino, L., Damone, L. A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Durán, I., Fernández-Dominguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Göbel, K., García, A. R., Garg, R., Gawlik, A., Gilardoni, S., Glodariu, T., Goncalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D. G., Jericha, E., Käppeler, F., Kadi, Y., Kahl, D., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Kokkoris, M., Krtička, M., Kurtulgil, D., Leal-Cidoncha, E., Leeb, H., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J, Macina, D., Marganiec, J., Martínez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A, Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P. M, Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Quesada, J. M, Radeck, D., Rauscher, T., Reifarth, R., Rubbia, C., Ryan, J. A, Sabateé-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sedyshev, P., Smith, A. G, Sosnin, N. V, Stamatopoulos, A., Tagliente, G., Tain, J. L, Tarifeño-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J, Wright, T., and Žugec, P.

Subjects
Nuclear reaction, QC1-999, Nuclear physics, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nucleosynthesis, Nuclear Astrophysics, 0103 physical sciences, Nuclear astrophysics, Nuclear Physics - Experiment, n_TOF, 010306 general physics, Nuclear Experiment, 010303 astronomy & astrophysics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Physics, Física [Àrees temàtiques de la UPC], Cross section, Isotope, Stable isotope ratio, Liquid scintillation counting, Neutron capture, neutron capture, 72Ge, n_TOF, Física nuclear, Nucleosíntesi
Abstract

The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The 72Ge(n, γ) cross section has an important influence on production of isotopes between Ge and Zr during s-process in massive stars and therefore experimental data are urgently required. 72Ge(n, γ) was measured at the neutron time-of-flight facility n_TOF (CERN) for the first time at stellar energies. The measurement was performed using an enriched 72GeO2 sample at a flight path of 185m with a set of liquid scintillation detectors (C6D6). The motivation, experiment and current status of the data analysis are reported.

Published
2017

48. Ground-state configuration of neutron-rich Al-35 via Coulomb breakup

Author

Reiner Kruecken, Heiko Scheit, T. Le Bleis, V. Panin, M. V. Ricciardi, Andreas Wagner, Helmut Weick, D. Cortina-Gil, Håkan T Johansson, Nasser Kalantar-Nayestanaki, J. Taylor, Thomas Nilsson, Yasuhiro Togano, W. N. Catford, Hans Geissel, Thomas Aumann, C. Scheidenberger, T. Kroell, F. Wamers, P. Díaz Fernández, D. M. Rossi, O. Ershova, G. Münzenberg, S. Chakraborty, Björn Jonson, M. A. Najafi, Ralf Plag, L. M. Fraile, Marielle Chartier, Stefan Typel, S. Beceiro-Novo, J. Marganiec, C. Nociforo, Rene Reifarth, Ushasi Datta, K. Boretzky, Yutaka Utsuno, G. de Angelis, Yvonne Leifels, B. V. Carlson, C. Langer, Anisur Rahaman, Herbert A. Simon, H. Emling, Catherine Rigollet, D. González-Díaz, C. Caesar, J. S. Winfield, and Research unit Nuclear & Hadron Physics

Subjects
Physics, ISLAND, IONS, COLLISIONS, Valence (chemistry), NUCLEI, Ion, N=20 SHELL CLOSURE, Atomic orbital, Excited state, EXCITATION, Coulomb, ISOTOPES, Neutron, INVERSION, Atomic physics, Nucleon, Ground state, EMISSION, MASS MEASUREMENTS
Abstract

The ground-state configuration of Al-35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of similar to 403 MeV/nucleon. The measured inclusive differential CD cross section for Al-35, integrated up to 5.0 MeV relative energy between the Al-34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34Al is 29(7) mb. The differential CD cross section of Al-35 -> Al-34 + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al-35 could be, tentatively, 1/2+ or 3/2(+) or 5/2(+). The valence neutrons, in the ground state of Al-35, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the Al-34 core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2+ is the ground-state spin-parity of Al-35 as suggested in the literature, then the major ground-state configuration of Al-35 is a combination of Al-34(g. s.; 4(-)) circle times upsilon(p3/2) and Al-34(isomer; 1(+)) circle times upsilon(d3/2) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

Published
2017

49. β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126

Author

Yu. A. Litvinov, I. Dillmann, K. Steiger, Karl Smith, Hans Geissel, G. Cortes, Carlos Guerrero, E. Wilson, J. L. Tain, A. R. García, Roman Gernhäuser, E. Sokol, H. Schaffner, N. Kurz, A. Evdokimov, C. Domingo-Pardo, Helmut Weick, S. Pietri, J. Benlliure, M. Marta, D. Cano-Ott, L. Maier, R. Caballero-Folch, J. Agramunt, F. Calviño, J. Kurcewicz, F. Montes, A. Algora, M. Bowry, T. Martinez, A. Prochazka, A. V. Yeremin, C. Paradela, J. Marganiec, F. Ameil, M. B. Gómez-Hornillos, D. Galaviz, R. Knöbel, Zs. Podolyák, Stephen Rice, B. Rubio, C. Nociforo, Bao-Hua Sun, I. Kojouharov, D. Testov, Yassid Ayyad, C. Scheidenberger, R. Wood, D. R. Napoli, Philip Woods, Matthias Heil, Ivan Mukha, W. Gelletly, F. Farinon, A. Riego, M. Takechi, C. Hinke, A. Estrade, J. S. Winfield, Thomas Faestermann, and Thomas Davinson

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, 7. Clean energy, Ion, 0103 physical sciences, Neutron detection, r-process, Neutron, Atomic physics, 010306 general physics, s-process, Delayed neutron
Abstract

Background: Previous measurements of Beta-delayed neutron emitters comprise around 230 nuclei, spanning from the 8He up to 150La. Apart from 210Tl, with a minuscule branching ratio of 0.07%, no other neutron emitter is measured yet beyond A = 150. Therefore new data are needed, particularly in the heavy mass region around N=126, in order to guide theoretical models and to understand the formation of the third r-process peak at A 195. Purpose: To measure both, Beta-decay half-lives and neutron branching ratios of several neutron-rich Au, Hg, Tl, Pb and Bi isotopes beyond N = 126. Method: Ions of interest are produced by fragmentation of a 238U beam, selected and identifed via the GSI-FRS fragment separator. A stack of segmented silicon detectors (SIMBA) is used to measure ion-implants and -decays. An array of 30 3He tubes embedded in a polyethylene matrix (BELEN) is used to detect neutrons with high efficiency and selectivity. A self-triggered digital system is employed to acquire data and to enable time-correlations. The latter are analyzed with an analytical model and results for the half-lives and neutron-branching ratios are derived using the binned Maximum-Likelihood method. Results: Twenty new Beta-decay half-lives are reported for 204

Published
2017

50. Results of an international comparison of activity measurements of

Author

J T, Cessna, R, Fitzgerald, B E, Zimmerman, L, Laureano-Pérez, D E, Bergeron, F, van Wyngaardt, M, Smith, T, Jackson, B, Howe, C J, da Silva, A, Iwahara, P A L, da Cruz, M, Zhang, H, Liu, J, Liang, C, Fréchou, C, Bobin, P, Cassette, K, Kossert, O, Nähle, J, Marganiec-Gałązka, L, Joseph, A, Ravindra, D N, Kulkarni, A, Yunoki, Y, Sato, K B, Lee, J M, Lee, Agung, T, Dziel, A, Listkowska, Z, Tymiński, M, Sahagia, A, Antohe, M-R, Ioan, A, Luca, M, Krivosek, J, Ometakova, A, Javornik, M, Zalesakova, E, García-Toraño Martinez, M, Roteta, M, Mejuto, Y, Nedjadi, F, Juget, M-C, Yuan, C Y, Yeh, E, Yeltepe, A, Dirican, J, Keightley, and A, Pearce

Abstract

An international key comparison, identifier CCRI(II)-K2.Ge-68, has been performed. The National Institute of Standards and Technology (NIST) served as the pilot laboratory, distributing aliquots of a

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results