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1. 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

2. The $^{154}$Gd neutron capture cross section measured at the n_TOF facility and its astrophysical implications

Author

F. Ogállar, G. Tagliente, D. Ramos Doval, Z. Eleme, M. Sabaté-Gilarte, Ignacio Porras, A. Casanovas, B. Fernández-Domíngez, A. Oprea, O. Aberle, M. A. Millán-Callado, A. Musumarra, L. Caballero, A. Pavlik, J. Lerendegui-Marco, C. Domingo-Pardo, A. Masi, S. Amaducci, A. S. Brown, R. Vlastou, D. G. Jenkins, E. Berthoumieux, V. Variale, Dimitri Rochman, Rugard Dressler, L. Cosentino, A. Gawlik, Kathrin Göbel, Arnd R. Junghans, A. Kimura, J. Andrzejewski, P. Torres-Sánchez, Claudia Lederer-Woods, E. Dupont, Rene Reifarth, I. Duran, Jan Heyse, Y. Kopatch, S. Bennett, M. A. Cortés-Giraldo, N. V. Sosnin, M. Mastromarco, I. Knapova, F. Cerutti, A. Stamatopoulos, J. M. Quesada, Y. Kadi, V. Vlachoudis, P. Vaz, Massimo Barbagallo, Annamaria Mazzone, L. Tassan-Got, Petar Žugec, A. Tsinganis, Diego Vescovi, Maurizio Busso, Sergio Cristallo, P. Sprung, B. Thomas, F. Mingrone, Anton Wallner, P. M. Milazzo, Simone Gilardoni, Alberto Ventura, Deniz Kurtulgil, Luciano Piersanti, Ariel Tarifeño-Saldivia, S. J. Lonsdale, L. A. Damone, V. Alcayne, U. Jiri, S. Valenta, Nicola Colonna, D. Cano-Ott, E. González-Romero, D. Bosnar, E. Pirovano, V. Michalopoulou, A. Sekhar, M. Diakaki, Marco Calviani, L. Audouin, E. Mendoza, Javier Praena, A. G. Smith, M. Krtička, M. Dietz, Peter Schillebeeckx, E. Jericha, V. Babiano-Suarez, S. Heinitz, F. Calviño, T. Martinez, Paolo Finocchiaro, C. Petrone, J. L. Tain, V. Furman, J. Perkowski, T. J. Wright, Dorothea Schumann, F. Gunsing, Cristian Massimi, E. Chiaveri, J. Moreno-Soto, P. F. Mastinu, S. Urlass, I. Ferro-Gonçalves, C. Rubbia, A. Mengoni, Q. Ducasse, A. Manna, D. Macina, Carlos Guerrero, R. Garg, M. Bacak, Alexandru Negret, F. Käppeler, P. J. Woods, N. Patronis, A. K. Saxena, Arnaud Ferrari, I. Ladarescu, G. Vannini, Emilio Andrea Maugeri, M. Kokkoris, M. Caamaño, P. J. Davies, 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, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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, Isotope, 010308 nuclear & particles physics, QC1-999, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron temperature, Nuclear physics, Samarium, Neutron capture, Stellar nucleosynthesis, chemistry, n_TOF, 154Gd, neutron capture, neutron time of flight, 0103 physical sciences, Neutron cross section, Nuclear Physics - Experiment, Neutron, Decay chain, Nuclear Experiment, 010303 astronomy & astrophysics
Abstract

The (n, γ) cross sections of the gadolinium isotopes play an important role in the study of the stellar nucleosynthesis. In particular, among the isotopes heavier than Fe, 154Gd together with 152Gd have the peculiarity to be mainly produced by the slow capture process, the so-called s-process, since they are shielded against the β-decay chains from the r-process region by their stable samarium isobars. Such a quasi pure s-process origin makes them crucial for testing the robustness of stellar models in galactic chemical evolution (GCE). According to recent models, the 154Gd and 152Gd abundances are expected to be 15-20% lower than the reference un-branched s-process 150Sm isotope. The close correlation between stellar abundances and neutron capture cross sections prompted for an accurate measurement of 154Gd cross section in order to reduce the uncertainty attributable to nuclear physics input and eventually rule out one of the possible causes of present discrepancies between observation and model predictions. To this end, the neutron capture cross section of 154Gd was measured in a wide neutron energy range (from thermal up to some keV) with high resolution in the first experimental area of the neutron time-of-flight facility n_TOF (EAR1) at CERN. In this contribution, after a brief description of the motivation and of the experimental setup used in the measurement, the preliminary results of the 154Gd neutron capture reaction as well as their astrophysical implications are presented.

Published
2019

3. Neutron capture cross section measurements of $^{241}$Am at the n_TOF facility

Author

A. Manna, Ralf Nolte, Alexandru Negret, F. Becčvář, F. Käppeler, M. Bacak, A. Kimura, Rene Reifarth, G. Vannini, Y. H. Chen, L. A. Damone, F. Gunsing, T. Glodariu, A. Oprea, O. Aberle, J. L. Tain, T. Talip, Emilio Andrea Maugeri, M. Caamaño, L. Cosentino, M. Kokkoris, Cristian Massimi, L. Audouin, Claudia Lederer-Woods, V. Michalopoulou, P. Vaz, Rugard Dressler, E. Jericha, J. M. Quesada, F. Cerutti, L. Tassan-Got, Alberto Ventura, G. Cortes, Niko Kivel, Francesca Matteucci, A. Tsinganis, Paolo Finocchiaro, I. Duran, V. Alcayne, P. J. Woods, F. Calviño, J. Andrzejewski, Nicola Colonna, D. Bosnar, J. Perkowski, Dorothea Schumann, V. Furman, T. J. Wright, Deniz Kurtulgil, E. Mendoza, J. Ulrich, A. Masi, M. Krtička, Sergio Cristallo, J. Lerendegui-Marco, S. Amaducci, Y. Kopatch, Vasilis Vlachoudis, N. Patronis, A. K. Saxena, Peter Schillebeeckx, T. Martinez, D. G. Jenkins, Arnaud Ferrari, N. V. Sosnin, Kathrin Göbel, C. Rubbia, I. Ladarescu, A. Stamatopoulos, I. F. Gonçalves, G. Bellia, F. Ogállar, Simone Gilardoni, Jan Heyse, J. Billowes, Annamaria Mazzone, P. Torres-Sánchez, Z. Eleme, E. Chiaveri, D. Cano-Ott, M. Diakaki, P. F. Mastinu, Petar Žugec, B. Femandez-Domínguez, A. Pavlik, V. Bécares, C. Domingo-Pardo, Hideo Harada, G. Tagliente, M. A. Cortés-Giraldo, B. Geslot, A. Musumarra, E. Dupont, L. Caballero-Ontanaya, M. Mastromarco, D. Macina, A. Casanovas, D. Ramos-Doval, Carlos Guerrero, Y. Kadi, Massimo Barbagallo, R. Garg, A. Gawlik, S. Valenta, A. S. Brown, Marco Calviani, A. G. Smith, Javier Praena, S. Lo Meo, M. Dietz, Anton Wallner, P. M. Milazzo, Maurizio Busso, R. Vlastou, D. Radeck, L. Persanti, E. Berthoumieux, S. Urlass, M. Sabaté-Gilarte, E. González-Romero, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, A. Mengoni, S. Heinitz, V. Variale, Dimitri Rochman, F. Mingrone, V. Babiano-Suarez, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), n_TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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, Large Hadron Collider, 010308 nuclear & particles physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Time of flight, Cross section (physics), Neutron capture, Cascade, 0103 physical sciences, Neutron cross section, Nuclear Physics - Experiment, Neutron, 010306 general physics, Nuclear Experiment, Energy (signal processing), n_TOF, 241Am, neutron capture, neutron time of flight
Abstract

Neutron capture on 241Am plays an important role in the nuclear energy production and also provides valuable information for the improvement of nuclear models and the statistical interpretation of the nuclear properties. A new experiment to measure the 241Am(n, γ) cross section in the thermal region and the first few resonances below 10 eV has been carried out at EAR2 of the n_TOF facility at CERN. Three neutron-insensitive C6D6 detectors have been used to measure the neutron-capture gamma cascade as a function of the neutron time of flight, and then deduce the neutron capture yield. Preliminary results will be presented and compared with previously obtained results at the same facility in EAR1. In EAR1 the gamma-ray background at thermal energies was about 90% of the signal while in EAR2 is up to a 25 factor much more favorable signal to noise ratio. We also extended the low energy limit down to subthermal energies. This measurement will allow a comparison with neutron capture measurements conducted at reactors and using a different experimental technique.

Published
2019

4. Measurement of the energy-differential cross-section of the $^{12}$C(n,p)$^{12}$B and $^{12}$C(n,d)$^{11}$B reactions at the n_TOF facility at CERN

Author

Kathrin Göbel, P. J. Woods, N. Patronis, A. K. Saxena, Jan Heyse, Arnaud Ferrari, O. Aberle, I. Ladarescu, M. A. Millán-Callado, Diego Vescovi, I. Duran, J. Lerendegui-Marco, S. Amaducci, Y. Kadi, M. Sabaté Gilarte, N. V. Sosnin, F. Ogállar, A. Kimura, Emilio Andrea Maugeri, M. Kokkoris, D. Cano-Ott, A. Sekhar, M. Diakaki, Rugard Dressler, I. Ferro-Gonçalves, J. Moreno-Soto, F. Calviño, J. Perkowski, M. Krtička, Claudia Lederer-Woods, Annamaria Mazzone, Petar Žugec, Simone Gilardoni, G. Tagliente, D. Ramos Doval, G. Vannini, A. Musumarra, Alexandru Negret, F. Käppeler, B. Fernández-Domíngez, A. Tsinganis, Luciano Piersanti, T. Martinez, L. A. Damone, P. Sprung, U. Jiri, A. Oprea, Nicola Colonna, V. Michalopoulou, L. Caballero, E. Mendoza, Deniz Kurtulgil, M. Mastromarco, M. Caamaño, V. Babiano-Suarez, J. Andrzejewski, Peter Schillebeeckx, V. Variale, S. Valenta, Dimitri Rochman, Arnd R. Junghans, Massimo Barbagallo, M. Bacak, A. Casanovas, F. Cerutti, V. Vlachoudis, Anton Wallner, M. A. Cortés-Giraldo, Rene Reifarth, Marco Calviani, P. J. Davies, A. Manna, E. Pirovano, G. Cortes, L. Cosentino, A. G. Smith, M. Dietz, J. M. Quesada, L. Tassan-Got, F. Mingrone, Sergio Cristallo, E. Chiaveri, Javier Praena, P. F. Mastinu, S. Urlass, C. Rubbia, V. Furman, T. J. Wright, A. Masi, S. Heinitz, P. Torres-Sánchez, R. Vlastou, C. Petrone, Q. Ducasse, E. Berthoumieux, D. G. Jenkins, D. Bosnar, S. Bennett, A. Stamatopoulos, Z. Eleme, D. Macina, Carlos Guerrero, R. Garg, J. L. Tain, A. Pavlik, C. Domingo-Pardo, L. Audouin, E. Jericha, Paolo Finocchiaro, Dorothea Schumann, A. S. Brown, P. M. Milazzo, Y. Kopatch, F. Gunsing, E. Dupont, I. Knapova, Cristian Massimi, P. Vaz, B. Thomas, V. Alcayne, Alberto Ventura, Maurizio Busso, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, A. Mengoni, A. Gawlik, E. González-Romero, 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, 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, Scattering cross-section, Nuclear reaction, Large Hadron Collider, Silicon, 010308 nuclear & particles physics, QC1-999, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, chemistry, 0103 physical sciences, Nuclear Physics - Experiment, Graphite, 010306 general physics, n_TOF, 12C(n, p), 12C(n, d), neutron time of flight, Energy (signal processing)
Abstract

Although the 12C(n,p)12B and 12C(n,d)11B reactions are of interest in several fields of basic and applied Nuclear Physics the present knowledge of these two cross-sections is far from being accurate and reliable, with both evaluations and data showing sizable discrepancies. As part of the challenging n_TOF program on (n,cp) nuclear reactions study, the energy differential cross-sections of the 12C(n,p)12B and 12C(n,d)11 B reactions have been measured at CERN from the reaction thresholds up to 30 MeV neutron energy. Both measurements have been recently performed at the long flight-path (185 m) experimental area of the n_TOF facility at CERN using a pure (99.95%) rigid graphite target and two silicon telescopes. In this paper an overview of the experiment is presented together with a few preliminary results.

Published
2019

5. Study of the photon strength functions and level density in the gamma decay of the n + $^{234}U$ reaction

Author

J. Moreno-Soto, W Dridi, L. Persanti, G. Cortes, S. Urlass, A. Musumarra, J. Andrzejewski, O Litaize, A. Kimura, Javier Praena, M. Bacak, S. Valenta, O. Aberle, A. Oprea, Diego Vescovi, Marco Calviani, Maurizio Busso, A. G. Smith, D. Macina, Carlos Guerrero, A Chebboubi, V. Variale, Dimitri Rochman, Arnd R. Junghans, M. Dietz, S. Heinitz, G. Vannini, Ariel Tarifeño-Saldivia, S. J. Lonsdale, A. Gawlik, C. Petrone, Thomas Rauscher, L. A. Damone, E. Chiaveri, Rugard Dressler, P. F. Mastinu, A. Pavlik, F. Cerutti, M. Sabaté-Gilarte, N. V. Sosnin, C. Domingo-Pardo, Annamaria Mazzone, L. Caballero-Ontanaya, A. Tsinganis, M. Caamaño, Claudia Lederer-Woods, S. Bennett, I. Duran, F. Gunsing, M. Krtiˇcka, E. González-Romero, Petar Žugec, O. Serot, P. Sprung, A. Stamatopoulos, Nicola Colonna, Ignacio Porras, Deniz Kurtulgil, A. Mengoni, Kathrin Göbel, E. Dupont, Vasilis Vlachoudis, P. J. Davies, Simone Gilardoni, D. Ramos-Doval, Cristian Massimi, Z. Eleme, Y. Kadi, S. Simone, M. Mastromarco, V. Alcayne, Massimo Barbagallo, E. Pirovano, Jan Heyse, Anton Wallner, D. Cano-Ott, A. Sekhar, M. Diakaki, T. Martinez, J. Ulrich, R. Vlastou, E. Berthoumieux, Y. Kopatch, V. Furman, T. J. Wright, F. Mingrone, I. F. Gonçalves, I. Knapova, F. Calviño, P. Vaz, J. Perkowski, M. A. Cortés-Giraldo, L. Audouin, Alberto Ventura, D. Bosnar, Th. Benedikt, Alexandru Negret, B. Fernández-Domínguez, F. Käppeler, V. Babiano-Suarez, L. Cosentino, A. Manna, F. Ogállar, A. Masi, D. G. Jenkins, G. Tagliente, A. Casanovas, Paolo Finocchiaro, Dorothea Schumann, A. S. Brown, V. Bécares, P. M. Milazzo, Rene Reifarth, J. M. Quesada, L. Tassan-Got, Sergio Cristallo, V. Michalopoulou, E. Mendoza, Peter Schillebeeckx, Emilio Andrea Maugeri, M. Kokkoris, P. J. Woods, N. Patronis, A. K. Saxena, Arnaud Ferrari, I. Ladarescu, J. Billowes, Q. Ducasse, J. L. Tain, 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-Saclay, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11), n_TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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), Serot, O., and Chebboubi, A.

Subjects
neutron captures, Physics, [PHYS]Physics [physics], Photon, Large Hadron Collider, actinides, 010308 nuclear & particles physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Radiative capture, Gamma ray, neutron captures, n_TOF, actinides, Actinide, n_TOF, photon strengts, level density, 234U, 01 natural sciences, Spectral line, Nuclear physics, 13. Climate action, 0103 physical sciences, n_TOF, Other, Multiplicity (chemistry), 010306 general physics, Nuclear Experiment
Abstract

The accurate calculations of neutron-induced reaction cross sections are relevant for many nuclear applications. The photon strength functions and nuclear level densities are essential inputs for such calculations. These quantities for 235U are studied using the measurement of the gamma de-excitation cascades in radiative capture on 234U with the Total Absorption Calorimeter at n_TOF at CERN. This segmented 4π gamma calorimeter is designed to detect gamma rays emitted from the nucleus with high efficiency. This experiment provides information on gamma multiplicity and gamma spectra that can be compared with numerical simulations. The code diceboxc is used to simulate the gamma cascades while geant4 is used for the simulation of the interaction of these gammas with the TAC materials. Available models and their parameters are being tested using the present data. Some preliminary results of this ongoing study are presented and discussed.

Published
2018

6. 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

7. $^{7}$ 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

8. First Measurement of the $Q^2$ Dependence of the Beam-Normal Single Spin Asymmetry for Elastic Scattering off Carbon

Author

P. Herrmann, Concettina Sfienti, S. Širca, K. Aulenbacher, M. Dehn, B. S. Schlimme, Ivica Friščić, F. E. Maas, J. Müller, J. Beričič, D. Bosnar, S. Štajner, M. Hoek, B. Spruck, U. Müller, Michaela Thiel, Kent Paschke, H. Fonvieille, A. Weber, S. Baunack, S. Kegel, M. O. Distler, J. Pochodzalla, T. Kolar, M. Mihovilovic, V. Tioukine, H. J. Kreidel, Y. Kohl, C. Palatchi, Mikhail Gorchtein, Anselm Esser, A. Tyukin, L. Correa, Patrick Achenbach, M. Schoth, Harald Merkel, S. Heidrich, F. Schulz, F. Nillius, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
carbon: target, electron: polarized beam, media_common.quotation_subject, General Physics and Astronomy, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], momentum transfer dependence, 01 natural sciences, Asymmetry, Mainz Linac, 0103 physical sciences, gallium: arsenic, polarization: transverse, elektronsko raspršenje, 010306 general physics, Nuclear Experiment, Spin-½, media_common, Physics, Elastic scattering, form factor: ratio, form factor: charge, exchange: two-photon, 010308 nuclear & particles physics, nucleus: target, izmjena dva fotona, electron nucleus: elastic scattering, Charge (physics), amplitude analysis, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, spin: asymmetry: measured, Elektronsko raspršenje, izmjena dva fotona, Amplitude, Cover (topology), High Energy Physics::Experiment, Atomic physics, radiation: laser, Beam (structure), photoelectron, experimental results
Abstract

We report on the first Q^{2}-dependent measurement of the beam-normal single spin asymmetry A_{n} in the elastic scattering of 570 MeV vertically polarized electrons off ^{12}C. We cover the Q^{2} range between 0.02 and 0.05 GeV^{2}/c^{2} and determine A_{n} at four different Q^{2} values. The experimental results are compared to a theoretical calculation that relates A_{n} to the imaginary part of the two-photon exchange amplitude. The result emphasizes that the Q^{2} behavior of A_{n} given by the ratio of the Compton to charge form factors cannot be treated independently of the target nucleus.

Published
2018

9. 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

10. High-accuracy determination of the neutron flux in the new experimental area n_TOF-EAR2 at CERN

Author

D. Cano-Ott, A. Pavlik, C. Domingo-Pardo, P. Vaz, Alberto Ventura, G. Vannini, Y. H. Chen, F. Bečvář, M. Caamaño, G. Tagliente, C. Wolf, M. Licata, Peter Schillebeeckx, J. Billowes, V. Bécares, O. Aberle, A. Villacorta, R. J. W. Frost, M. S. Robles, F. Belloni, J. Andrzejewski, M. Bacak, D. G. Jenkins, M. Sabaté-Gilarte, V. Ketlerov, E. Jericha, R. Baccomi, F. R. Palomo-Pinto, E. González, F. Cerutti, M. Diakaki, Paolo Finocchiaro, K. Rajeev, Dorothea Schumann, Francesca Matteucci, Luigi Cosentino, M. A. Cortés-Giraldo, C. Weiss, J. I. Porras, T. Glodariu, Roberto Losito, J. A. Ryan, B. Fernández-Domínguez, A. R. García, F. Käppeler, A. Oprea, Y. Kadi, C. Rubbia, M. Brugger, J. Lerendegui-Marco, N. Patronis, C. Beinrucker, A. K. Saxena, R. Cardella, Hideo Harada, M. Mastromarco, I. F. Gonçalves, E. Leal-Cidoncha, Arnaud Ferrari, V. Khryachkov, A. Gawlik, Anton Wallner, Thomas Rauscher, Rugard Dressler, P. M. Milazzo, J. L. Tain, Javier Praena, S. Lo Meo, J. Balibrea, Niko Kivel, P. Kavrigin, A. Tsinganis, Ralf Nolte, A. Casanovas, M. Piscopo, Nicola Colonna, E. Griesmayer, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. Krtička, Emilio Andrea Maugeri, Vasilis Vlachoudis, Tatsuya Katabuchi, S. Valenta, Alberto Mengoni, T. Martinez, Marco Calviani, T. Papaevangelou, M. Kokkoris, S. Barros, A. G. Smith, I. Duran, Philip Woods, A. Hernández-Prieto, L. A. Damone, Rene Reifarth, J. Marganiec, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, E. Chiaveri, G. Cortés, P. F. Mastinu, S. Warren, V. Variale, P. V. Sedyshev, A. Musumarra, K. Deo, D. M. Castelluccio, Tanja Heftrich, A. Riego-Perez, D. Macina, Carlos Guerrero, C. Paradela, S. Heinitz, L. Audouin, Kathrin Göbel, Jan Heyse, V. Furman, T. J. Wright, E. Mendoza, R. Vlastou, E. Berthoumieux, Petar Žugec, A. Kimura, Mario Barbagallo, S. V. Suryanarayana, A. Goverdovski, M. Mirea, F. Calviño, H. Leeb, J. Perkowski, Pedro G. Ferreira, Mario Weigand, F. Gunsing, Cristian Massimi, E. Dupont, Ioana Gheorghe, S. Montesano, A. Stamatopoulos, P. C. Rout, F. Mingrone, C. Lederer, D. Bosnar, 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), 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), 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), Sabaté-Gilarte, M., Barbagallo, M., Colonna, N., Gunsing, F., Žugec, P., Vlachoudis, V., Chen, Y. H., Stamatopoulos, A., Lerendegui-Marco, J., Cortés-Giraldo, M. A., Villacorta, A., Guerrero, C., Damone, L., Audouin, L., Berthoumieux, E., Cosentino, L., Diakaki, M., Finocchiaro, P., Musumarra, A., Papaevangelou, T., Piscopo, M., Tassan-Got, L., Aberle, O., Andrzejewski, J., Bécares, V., Bacak, M., Baccomi, R., Balibrea, J., Barros, S., Bečvář, F., Beinrucker, C., Belloni, F., Billowes, J., Bosnar, D., Brugger, M., Caamaño, M., Calviño, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Castelluccio, D. M., Cerutti, F., Chiaveri, E., Cortés, G., Deo, K., Domingo-Pardo, C., Dressler, R., Dupont, E., Durán, I., Fernández-Domínguez, B., Ferrari, A., Ferreira, P., Frost, R. J. W., Furman, V., Göbel, K., García, A. R., Gawlik, A., Gheorghe, I., Glodariu, T., Gonçalves, I. F., González, E., Goverdovski, A., Griesmayer, E., Harada, H., Heftrich, T., Heinitz, S., Hernández-Prieto, A., Heyse, J., Jenkins, D. G., Jericha, E., Käppeler, F., Kadi, Y., Katabuchi, T., Kavrigin, P., Ketlerov, V., Khryachkov, V., Kimura, A., Kivel, N., Kokkoris, M., Krtička, M., Leal-Cidoncha, E., Lederer, C., Leeb, H., Licata, M., Lo Meo, S., Lonsdale, S. J., Losito, R., Macina, D., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P., Mastromarco, M., Matteucci, F., Maugeri, E. A., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Montesano, S., Nolte, R., Oprea, A., Palomo-Pinto, F. R., Paradela, C., Patronis, N., Pavlik, A., Perkowski, J., Porras, J. I., Praena, J., Quesada, J. M., Rajeev, K., Rauscher, T., Reifarth, R., Riego-Perez, A., Robles, M. S., Rout, P. C., Rubbia, C., Ryan, J. A., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Sedyshev, P., Smith, A. G., Suryanarayana, S. V., Tagliente, G., Tain, J. L., Tarifeño-Saldivia, A., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Weigand, M., Wolf, C., Woods, P. J., Weiss, C., Wright, T., 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
Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Flux, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, n-tof, Neutron flux, 0103 physical sciences, CERN, Spallation, 010306 general physics, Nuclear Experiment, n_TOF, EAR2, neutron flux measurement, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Neutron radiation, Neutron temperature, Radiation flux, Physics::Accelerator Physics, Beam (structure)
Abstract

A new high flux experimental area has recently become operational at the n_TOF facility at CERN. This new measuring station, n_TOF-EAR2, is placed at the end of a vertical beam line at a distance of approximately 20m from the spallation target. The characterization of the neutron beam, in terms of flux, spatial profile and resolution function, is of crucial importance for the feasibility study and data analysis of all measurements to be performed in the new area. In this paper, the measurement of the neutron flux, performed with different solid-state and gaseous detection systems, and using three neutron-converting reactions considered standard in different energy regions is reported. The results of the various measurements have been combined, yielding an evaluated neutron energy distribution in a wide energy range, from 2meV to 100MeV, with an accuracy ranging from 2%, at low energy, to 6% in the high-energy region. In addition, an absolute normalization of the n_TOF-EAR2 neutron flux has been obtained by means of an activation measurement performed with 197Au foils in the beam. © 2017, SIF, Springer-Verlag GmbH Germany.

Published
2017

11. Monte carlo simulations of the n_TOF lead spallation target with the Geant4 toolkit: A benchmark study

Author

S. Warren, J. Andrzejewski, V. Variale, M. Mastromarco, Pedro G. Ferreira, G. Vannini, M. A. Cortés-Giraldo, Rugard Dressler, N. Patronis, A. K. Saxena, Arnaud Ferrari, J. Billowes, J. Marganiec, E. Jericha, Paolo Finocchiaro, Anton Wallner, M. Caamaño, Nicola Colonna, A. Musumarra, Dorothea Schumann, E. Chiaveri, P. F. Mastinu, J. Balibrea, J. A. Ryan, Vasilis Vlachoudis, C. Rubbia, A. Tarifeño-Saldivia, G. Cortes, E. González, A. Pavlik, L. Audouin, A. Ventura, M. Sabaté-Gilarte, F. Calviño, H. Leeb, J. Perkowski, A. Casanovas, Y. H. Chen, P. C. Rout, C. Domingo-Pardo, M. Bacak, A. Kimura, J. L. Tain, F. Gunsing, T. Glodariu, F. Mingrone, A. Masi, D. G. Jenkins, E. Dupont, Cristian Massimi, C. Lederer, M. Diakaki, Niko Kivel, F. Cerutti, M. Krtička, Kathrin Göbel, A. S. Brown, Alexandru Negret, S. J. Lonsdale, J. Lerendegui-Marco, E. Mendoza, T. Martinez, B. Fernández-Domínguez, F. Käppeler, Jan Heyse, Mario Barbagallo, M.B. Gómez-Hornillos, A. Oprea, A. Kalamara, I. F. Gonçalves, Javier Praena, S. Lo Meo, P. M. Milazzo, A. Stamatopoulos, S. Heinitz, Ignacio Porras, F. Bečvář, T. J. Wright, D. Mancussi, Simone Gilardoni, Hideo Harada, Rene Reifarth, R. Cardella, A. Mengoni, O. Aberle, Peter Schillebeeckx, J. M. Quesada, L. Tassan-Got, Deniz Kurtulgil, R. Vlastou, P. Vaz, D. Radeck, E. Berthoumieux, L. Cosentino, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, D. Bosnar, D. Macina, Carlos Guerrero, G. Tagliente, D. Cano-Ott, Y. Kadi, S. Valenta, Marco Calviani, A. G. Smith, Philip Woods, A. R. García, Emilio Andrea Maugeri, M. Kokkoris, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, I. Duran, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, 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, Lerendegui-Marco, J., Cortés-Giraldo, M.A., Guerrero, C., Quesada, J.M., Meo, S. Lo, Massimi, C., Barbagallo, M., Colonna, N., Mancussi, D., Mingrone, F., Sabaté-Gilarte, M., Vannini, G., Vlachoudis, V., Aberle, O., Andrzejewski, J., Audouin, L., Bacak, M., Balibrea, J., 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., Cosentino, L., Damone, L.A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Durán, I., Fernández-Domínguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Göbel, K., Gómez-Hornillos, M.B., García, A.R., Gawlik, A., Gilardoni, S., Glodariu, T., Gonçalves, I.F., González, E., Griesmayer, E., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D.G., Jericha, E., Käppeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Kokkoris, M., Krtička, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Leeb, H., Lonsdale, S.J., Macina, D., Marganiec, J., Martínez, T., Masi, A., Mastinu, P., Mastromarco, M., Maugeri, E.A., Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P.M., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Radeck, D., Rauscher, T., Reifarth, R., Rout, P.C., Rubbia, C., Ryan, J.A., Saxena, A., Schillebeeckx, P., Schumann, D., Smith, A.G., Sosnin, N.V., Stamatopoulos, A., Tagliente, G., Tain, J.L., Tarifeño-Saldivia, A., Tassan-Got, L., Valenta, S., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Woods, P.J., Wright, T., Ugec, P., 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, Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia, 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), and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
nTOF, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Montecarlo, Mètode de, Monte Carlo method, Context (language use), Neutron, 01 natural sciences, Nuclear physics, Physics and Astronomy (all), Informàtica [Àrees temàtiques de la UPC], Neutron flux, CERN, 0103 physical sciences, Spallation, 010306 general physics, Nuclear Experiment, Monte Carlo, Neutrons, Physics, Large Hadron Collider, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Neutron radiation, Cascade, Nuclear Physics - Theory
Abstract

Monte Carlo (MC) simulations are an essential tool to determine fundamental features of a neutron beam, such as the neutron flux or the γ -ray background, that sometimes can not be measured or at least not in every position or energy range. Until recently, the most widely used MC codes in this field had been MCNPX and FLUKA. However, the Geant4 toolkit has also become a competitive code for the transport of neutrons after the development of the native Geant4 format for neutron data libraries, G4NDL. In this context, we present the Geant4 simulations of the neutron spallation target of the n TOF facility at CERN, done with version 10.1.1 of the toolkit. The first goal was the validation of the intra-nuclear cascade models implemented in the code using, as benchmark, the characteristics of the neutron beam measured at the first experimental area (EAR1), especially the neutron flux and energy distribution, and the time distribution of neutrons of equal kinetic energy, the so-called Resolution Function. The second goal was the development of aMonte Carlo tool aimed to provide useful calculations for both the analysis and planning of the upcoming measurements at the new experimental area (EAR2) of the facility., The research that led to these results has received funding from the EC FP7 Programme under the projects NEUTANDALUS (Grant No. 334315) and CHANDA (Grant No. 605203), and the Spanish Ministry of Economy and Competitiveness projects FPA2011-28770- C3-02, FPA2013-45083-P and FPA2014- 53290-C2-2-P. The simulations have been performed at the computing cluster FISATOM, hosted at CICA (Seville, Spain), and of INFN-CNAF, University of Bologna; we thank the staff of both institutions for the operational maintenance of the machines.

Published
2016

12. High-Resolution Decay-Pion Spectroscopy of $_\Lambda ^4\text{H}$ Hypernuclei

Author

Y. Fujii, Amur Margaryan, Lin-Ya Tang, Manami Fujita, L. Correa, U. Müller, Masashi Kaneta, Simon Širca, B. S. Schlimme, C. Sfienti, P. Achenbach, S. Aulenbacher, Sho Nagao, M. Mihovilovic, M. Steinen, W. Kusaka, R. Böhm, Ivica Friščić, F. Schulz, J. Beričič, M. Schoth, Hiroki Kanda, Michaela Thiel, A. Tyukin, Toshiyuki Gogami, Kyo Tsukada, H. Fonvieille, A. Weber, S. N. Nakamura, M. O. Distler, Y. Takahashi, Anselm Esser, Harald Merkel, D. Bosnar, S. Bleser, S. Kegel, J. Pochodzalla, A. Sanchez Lorente, Y. Kohl, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Lambda: hypernucleus, Binding energy, Nuclear Theory, momentum spectrum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Lambda, 01 natural sciences, tagged beam, Nuclear physics, Mainz Linac, Pion, 0103 physical sciences, Lambda: binding energy, Nuclear emulsion, 010306 general physics, Spectroscopy, Nuclear Experiment, Microtron, spectrometer calibration, Physics, Spectrometer, bias and uncertainty in peak fitting, 010308 nuclear & particles physics, Resolution (electron density), pi: decay, magnetic spectrometer, hypernuclear mass spectroscopy, microtron, mesonic weak decay, nuclear emulsion
Abstract

International audience; The first observation of \({}_{\Lambda }^{4}\text{H}\) fragments by means of decay-pion spectroscopy with a high resolution magnetic spectrometer was achieved in 2012 at the Mainz Microtron MAMI. The extracted Λ binding energy was consistent with older nuclear emulsion data, but almost one order of magnitude higher in precision, while being limited by systematic uncertainties. This paper gives details on the kaon tagging at 0° forward angle which was indispensable for the success of the experiment. In addition, a re-analysis of the data collected in 2012 is presented, including an improved a posteriori spectrometer calibration and a more robust fitting of the decay-pion peak in the momentum spectrum.

Published
2015

13. Experimental investigations of the hypernucleus $_Λ^4$H

Author

Patrick Achenbach, F. Schulz, Ivica Friščić, Masashi Kaneta, A. Sanchez Lorente, Kyo Tsukada, D. Bosnar, R. Böhm, Y. Fujii, Y. Kohl, Amur Margaryan, S. Bleser, L. G. Tang, Michaela Thiel, Simon Širca, M. Schoth, Hiroki Kanda, M. Steinen, Concettina Sfienti, W. Kusaka, M. Mihovilovic, J. Beričič, S. Aulenbacher, L. Correa, U. Müller, Manami Fujita, B. S. Schlimme, Sho Nagao, Toshiyuki Gogami, S. N. Nakamura, M. O. Distler, S. Kegel, J. Pochodzalla, Anselm Esser, Y. Takahashi, Harald Merkel, H. Fonvieille, A. Weber, A. Tyukin, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), A1, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Lambda: hypernucleus, QC1-999, Nuclear Theory, Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, tagged beam, Particle identification, pi, 010305 fluids & plasmas, Nuclear physics, Momentum, Mainz Linac, Pion, Coincident, beryllium: target, 0103 physical sciences, Calibration, 010306 general physics, Nuclear Experiment, Microtron, Physics, Spectrometer, pi: decay, resolution, suppression, Hypernucleus, magnetic spectrometer, microtron, hydrogen, momentum: calibration, background: random, High Energy Physics::Experiment, luminosity: high, particle identification
Abstract

International audience; Negatively charged pions from two-body decays of stopped _Lambda^4H hypernuclei were studied in 2012 at the Mainz Microtron MAMI, Germany. The momenta of the decay-pions were measured with unprecedented precision by using high-resolution magnetic spectrometers. A challenge of the experiment was the tagging of kaons from associated K^+∧ production off a Be target at very forward angles. In the year 2014, this experiment was continued with a better control of the systematic uncertainties, with better suppression of coincident and random background, improved particle identification, and with higher luminosities. Another key point of the progress was the improvement in the absolute momentum calibration of the magnetic spectrometers.

Published
2015

14. Experimental neutron capture data of 58Ni from the CERN n_TOF facility

Author

TOF Collaboration, ��ugec, P., Barbagallo, M., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., B��cares, V., Be��v����, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calvi��o, F., Cano-Ott, D., Carrapi��o, C., Cerutti, F., Chiaveri, E., Chin, M., Cort��s, G., Cort��s-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., Garc��a, A. R., Giubrone, G., G��mez-Hornillos, M. B., Gon��alves, I. F., Gonz��lez-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Jenkins, D. G., Jericha, E., Kadi, Y., K��ppeler, F., Karadimos, D., Koehler, P., Kokkoris, M., Krti��ka, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Losito, R., Manousos, A., Marganiec, J., Mart��nez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Pignatari, M., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Tagliente, G., Tain, J. L., Tarr��o, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Wei��, C., Wright, T., 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, nTOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, National Science Foundation (NSF). United States, Joint Institute for Nuclear Astrophysics (JINA) U.S., 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, Ventura, A., Mengoni, A., P. Zugec, M. Barbagallo, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, 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, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimo, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, L. S. Leong, 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, C. Paradela, A. Pavlik, J. Perkowski, M. Pignatari, 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, D. Tarrio, L. Tassan-Got, 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. Wright, 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
Nuclear and High Energy Physics, nTOF, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, NEUTRON RESONANCE ANALYSIS, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Time of flight, 58Ni neutron capture cross section, n_TOF, MACS, 0103 physical sciences, Neutron cross section, Física::Electromagnetisme [Àrees temàtiques de la UPC], Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Neutrons, Large Hadron Collider, Cross section, 010308 nuclear & particles physics, CERN - n_TOF, Resonance, Física, NEUTRON TIME OF FLIGHT, Neutron temperature, Neutron capture, Neutrons Capture, S PROCESS, s-process
Abstract

The $^{58}$Ni $(n,\gamma)$ cross section has been measured at the neutron time of flight facility n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total, 51 resonances have been analyzed up to 122 keV. Maxwellian averaged cross sections (MACS) have been calculated for stellar temperatures of kT$=$5-100 keV with uncertainties of less than 6%, showing fair agreement with recent experimental and evaluated data up to kT = 50 keV. The MACS extracted in the present work at 30 keV is 34.2$\pm$0.6$_\mathrm{stat}\pm$1.8$_\mathrm{sys}$ mb, in agreement with latest results and evaluations, but 12% lower relative to the recent KADoNIS compilation of astrophysical cross sections. When included in models of the s-process nucleosynthesis in massive stars, this change results in a 60% increase of the abundance of $^{58}$Ni, with a negligible propagation on heavier isotopes. The reason is that, using both the old or the new MACS, 58Ni is efficiently depleted by neutron captures., Comment: 10 pages, 8 figures, 5 tables

Published
2014

15. A new CVD diamond mosaic-detector for (n, α) cross-section measurements at the n_TOF experiment at CERN

Author

F. Bečvář, T. J. Wright, F. Cerutti, Mario Weigand, E. Gonzalez-Romero, Rene Reifarth, J. L. Tain, C. Lampoudis, C. Lederer, N. Kivel, Stefan Schmidt, M. Meaze, J. M. Quesada, F. Gunsing, J. Billowes, Jeri Kroll, P. Vaz, Srinivasan Ganesan, P. Gurusamy, K. Fraval, Cristian Massimi, Alberto Ventura, M. B. Gómez-Hornillos, E. Mendoza, C. Paradela, Javier Praena, R. Sarmento, Mario Barbagallo, E. Berthoumieux, M. S. Robles, A. Riego, M. Krtička, F. Calviño, M. A. Cortés-Giraldo, M. Mirea, G. Tagliente, Peter Schillebeeckx, N. Dzysiuk, Carlos Guerrero, A. Pavlik, T. Martinez, L. Audouin, Petar Žugec, Alfredo Ferrari, C. Domingo-Pardo, Roberto Losito, V. Variale, I. Duran, H. Leeb, M. Sabaté-Gilarte, M. Mastromarco, F. Käppeler, M. Diakaki, J. Perkowski, A. K. Saxena, P. M. Milazzo, J. Marganiec, A. Mallick, G. Vannini, Gerald Badurek, V. Boccone, S. Altstadt, A. Hernández-Prieto, A. J. M. Plompen, P. F. Mastinu, A. Manousos, C. Eleftheriadis, E. Jericha, G. Giubrone, E. Chiaveri, D. Cano-Ott, Alberto Mengoni, V. Bécares, Dorothea Schumann, Yacine Kadi, Rugard Dressler, C. Weiß, R. Versaci, P. E. Koehler, F. Mingrone, J. Andrzejewski, A. Tsinganis, G. Cortes, M. Kokkoris, D. Tarrío, Carlo Rubbia, Nicola Colonna, L.S. Leong, C. Langer, V. Vlachoudis, E. Griesmayer, T. Ware, C. Carrapiço, Anton Wallner, D. G. Jenkins, Laurent Tassan-Got, W. Mondalaers, Fabio Belloni, M. P. W. Chin, F. Roman, E. Leal-Cidoncha, I. Goncalves, Thomas Rauscher, M. J. Vermeulen, D. Karadimos, S. Valenta, A. R. García, M. Brugger, Marco Calviani, R. Vlastou, Damir Bosnar, 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, TOF, 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, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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), Ventura, A., Mengoni, A., C. Wei, E. Griesmayer, C. Guerrero, S. Altstadt, J. Andrzejewski, L. Audouin, G. Badurek, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calyiani, 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, I. Duran, R. Dressler, 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, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kappeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Mallick, 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, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Roble, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, 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, T. Wright, and P. Zugec

Subjects
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Energies [Àrees temàtiques de la UPC], Analytical chemistry, Chemical vapor deposition, 7. Clean energy, 01 natural sciences, CVD diamond detectors, Chemical reactions, n_TOF, Detectors and Experimental Techniques, Energy resolution, Nuclear Experiment, Instrumentation, Physics, sCVD diamond detectors, (n, α) Cross-section measurements, Large Hadron Collider, ntof, Detector, Resolution (electron density), Austria, Sponsored this work, Vienna, Nuclear Detector, Enginyeria química::Química física [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Cross-section measurements, Nanotechnology, engineering.material, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Reaccions químiques, Cross section (physics), 0103 physical sciences, (n,α) Cross-section measurement, Neutron, 010306 general physics, Diode, Energies::Energia nuclear [Àrees temàtiques de la UPC], CIVIDEC Instrumentation GmbH, 010308 nuclear & particles physics, (n,α) Cross-section measurements, n-TOF, neutrons, Diamond, (n, α) cross-section measurements, engineering, High Energy Physics::Experiment, diamond detector
Abstract

At the n\_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,$\alpha$) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the $^{59}$Ni(n,$\alpha$)$^{56}$Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented., Comment: Conference proceedings of the Vienna Conference on Instrumentation 2013

Published
2013

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