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1. Coulomb and nuclear excitations of Zn70 and Ni68 at intermediate energy

Author

G. de Angelis, J. Mrazek, L. Perrot, R. Borcea, R. Astabatyan, F. Carstoiu, H. Guerin, M. Stanoiu, T. Roger, S. Grévy, L. Stuhl, C. Petrone, Zs. Podolyák, M. N. Harakeh, A. Lepailleur, J. C. Thomas, L. Cáceres, D. D. Dao, I. Stefan, F. Negoita, M. Krzysiek, A. Gottardo, V. Maslov, S. Bagchi, C. Borcea, Dóra Sohler, I. Matea, O. Wieland, Z. Vajta, F. Nowacki, M. Vandebrouck, P. Morfouace, F. Rotaru, S. Lukyanov, I. Kuti, O. Sorlin, Megumi Niikura, S. Franchoo, A. Krasznahorkay, K. Mazurek, Y. Penionzhkevich, M. Ciemála, A. Maj, Zsolt Dombrádi, C. Rigollet, M. Kmiecik, I. M. Harca, Eric Clément, O. Kamalou, S. Calinescu, and L. Olivier

Subjects
Physics, Proton, 010308 nuclear & particles physics, Prolate spheroid, 01 natural sciences, Spectral line, Intermediate energy, 0103 physical sciences, Oblate spheroid, Coulomb, Atomic physics, 010306 general physics, Beam energy, Excitation
Abstract

The reduced transition probabilities B ( E 2 ; 0 g.s. + → 2 1 + , 2 2 + ) in Zn 70 and the full B ( E 2 ; 0 g.s. + → 2 + ) strength up to S n = 7.79 MeV in Ni 68 have been determined at the LISE/GANIL facility using the Coulomb-excitation technique at intermediate beam energy on a Pb 208 target. The γ rays emitted in-flight were detected with an array of 46 BaF 2 crystals. The angles of the deflected nuclei were determined in order to disentangle and extract the Coulomb and nuclear contributions to the excitation of the 2 + states. The measured B ( E 2 ; 0 g.s. + → 2 1 + ) of 1432(124) e 2 fm 4 for Zn 70 falls in the lower part of the published values which clustered either around 1600 or above 2000 e 2 fm 4 , while the B ( E 2 ; 0 g.s. + → 2 2 + ) of 53(7) e 2 fm 4 agrees very well with the two published values. The relatively low B ( E 2 ; 0 g.s. + → 2 1 + ) of 301(38) e 2 fm 4 for Ni 68 agrees with previous studies and confirms a local magicity at Z = 28 , N = 40 . Combining the results of the low-energy spectra of Ni 68 and Zn 70 and their shell-model interpretations, it is interesting to notice that four different shapes (spherical, oblate, prolate, and triaxial) are present. Finally, a summed E 2 strength of only about 150 e 2 fm 4 has been found experimentally at high excitation energy, likely due to proton excitations across the Z = 28 gap. The experimental distribution of this high-energy E 2 excitation agrees with shell-model calculations, but its strength is about two times weaker.

Published
2021
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2. Erratum: Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward N=40 and impact on r -process reaction rates [Phys. Rev. C 101 , 041304(R) (2020)]

Author

B. Bastin, Heikki Penttilä, Iain Moore, P. Ascher, Anu Kankainen, F. Nowacki, F. de Oliveira Santos, Juha Äystö, V. Alcindor, M. Vilen, A. Khanam, Dmitrii Nesterenko, A. Poves, V. A. Rubchenya, T. Eronen, Ari Jokinen, C. Petrone, A. de Roubin, L. Canete, S. Giraud, and Ilkka Pohjalainen

Subjects
Reaction rate, Physics, 010308 nuclear & particles physics, 0103 physical sciences, Nuclear structure, Analytical chemistry, r-process, 010306 general physics, 01 natural sciences
Published
2021
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3. Imaging neutron capture cross sections: i-TED proof-of-concept and future prospects based on Machine-Learning techniques

Author

Ignacio Porras, D. Macina, F. Ogállar, G. Cortes, G. Tagliente, A. Oprea, N. Patronis, A. K. Saxena, Claudia Lederer-Woods, Deniz Kurtulgil, Arnaud Ferrari, L. Audouin, Carlos Guerrero, S. Heinitz, R. Garg, Alberto Mengoni, I. Ladarescu, Rugard Dressler, C. Petrone, P. Torres-Sánchez, Hideo Harada, T. Rodríguez-González, J. Lerendegui-Marco, M. Sabaté-Gilarte, L. Persanti, J. Balibrea-Correa, A. Casanovas, J. Billowes, A. Tsinganis, V. Babiano-Suarez, S. Amaducci, S. Bennett, N. V. Sosnin, O. Aberle, Nicola Colonna, Luis Caballero, M. A. Millán-Callado, Simone Gilardoni, I. F. Gonçalves, A. Stamatopoulos, V. Variale, A. Kimura, Dimitri Rochman, Arnd R. Junghans, Annamaria Mazzone, L. Cosentino, A. Masi, Petar Žugec, M. Mastromarco, D. Bosnar, D. G. Jenkins, Z. Eleme, E. Dupont, Emilio Andrea Maugeri, D. Cano-Ott, P. Sprung, E. Mendoza, Massimo Barbagallo, Y. Kadi, Anton Wallner, Kathrin Göbel, M. Kokkoris, A. Sekhar, M. Diakaki, Y. Kopatch, I. Duran, A. Manna, A. Gawlik, Thomas Rauscher, Jan Heyse, D. Ramos-Doval, Diego Vescovi, Maurizio Busso, J. Andrzejewski, J. Moreno-Soto, M. Bacak, M. A. Cortés-Giraldo, Rene Reifarth, F. Mingrone, G. Vannini, D. Calvo, Paolo Finocchiaro, V. Vlachoudis, M. Krtička, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Dorothea Schumann, I. Knapova, J. M. Quesada, L. Tassan-Got, Alexandru Negret, S. Valenta, T. Martinez, E. Pirovano, B. Fernández-Domínguez, A. S. Brown, P. Vaz, Sergio Cristallo, Marco Calviani, E. González-Romero, F. Käppeler, A. G. Smith, D. Real, L. A. Damone, M. Caamaño, Alberto Ventura, M. Dietz, V. Alcayne, F. Calviño, H. Leeb, A. Musumarra, Philip Woods, A. Pavlik, E. Chiaveri, J. Perkowski, P. F. Mastinu, P. M. Milazzo, C. Domingo-Pardo, F. Cerutti, J. L. Tain, F. Gunsing, Th. Thomas, Cristian Massimi, S. Urlass, P. J. Davies, R. Vlastou, V. Michalopoulou, J. Ulrich, Peter Schillebeeckx, E. Berthoumieux, C. Rubbia, Q. Ducasse, Javier Praena, V. Furman, T. J. Wright, ITA, GBR, FRA, DEU, ESP, AUS, AUT, BEL, HRV, GRC, IND, POL, CZE, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), 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), Babiano-Su??rez, V., Lerendegui-Marco, J., Balibrea-Correa, J., Caballero, L., Calvo, D., Ladarescu, I., Real, D., Domingo-Pardo, C., Calvi??o, F., Casanovas, A., Tarife??o-Saldivia, A., Alcayne, V., Guerrero, C., Mill??n-Callado, M. A., Rodr??guez-Gonz??lez, T., Barbagallo, M., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Bacak, M., Bennett, S., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caama??o, M., Calviani, M., Cano-Ott, D., Cerutti, F., Chiaveri, E., Colonna, N., Cort??s, G., Cort??s-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Diakaki, M., Dietz, M., Dressler, R., Ducasse, Q., Dupont, E., Dur??n, I., Eleme, Z., Fern??ndez-Dom??nguez, B., Ferrari, A., Finocchiaro, P., Furman, V., G??bel, K., Garg, R., Gawlik, A., Gilardoni, S., Gon??alves, I. F., Gonz??lez-Romero, E., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D. G., Junghans, A., K??ppeler, F., Kadi, Y., Kimura, A., Knapova, I., Kokkoris, M., Kopatch, Y., Krti??ka, M., Kurtulgil, D., Lederer-Woods, C., Leeb, H., Lonsdale, S. J., Macina, D., Manna, A., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Og??llar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Persanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J. M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Rubbia, C., Sabat??-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N. V., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tassan-Got, L., Thomas, Th., Torres-S??nchez, P., Tsinganis, A., Ulrich, J., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T., and ugec, P.

Subjects
Astrophysics and Astronomy, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics: Instrumentation and Detectors, Astrophysics, Instrumentation and Methods for Astrophysics, Nuclear Experiment, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Astrophysics, 01 natural sciences, 0103 physical sciences, Electronic engineering, Nuclear Physics - Experiment, Sensitivity (control systems), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics::Atmospheric and Oceanic Physics, Physics, Large Hadron Collider, i-TED, neutron capture, n_TOF, machine learning, 010308 nuclear & particles physics, Compton imaging, Detector, Experimental validation, Instrumentation and Detectors (physics.ins-det), Neutron capture, Physics: Instrumentation and Detectors, Proof of concept, Benchmark (computing), Instrumentation and Methods for Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, astro-ph.IM
Abstract

Babiano-Suárez, V., et al., i-TED is an innovative detection system which exploits Compton imaging techniques to achieve a superior signal-to-background ratio in (n, γ) cross-section measurements using time-of-flight technique. This work presents the first experimental validation of the i-TED apparatus for high-resolution time-of-flight experiments and demonstrates for the first time the concept proposed for background rejection. To this aim, the Au(n, γ) and Fe(n, γ) reactions were studied at CERN n_TOF using an i-TED demonstrator based on three position-sensitive detectors. Two CD detectors were also used to benchmark the performance of i-TED. The i-TED prototype built for this study shows a factor of ∼ 3 higher detection sensitivity than state-of-the-art CD detectors in the 10 keV neutron-energy region of astrophysical interest. This paper explores also the perspectives of further enhancement in performance attainable with the final i-TED array consisting of twenty position-sensitive detectors and new analysis methodologies based on Machine-Learning techniques., This work has been carried out in the framework of a project funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC Consolidator Grant project HYMNS, with grant agreement No. 681740). The authors acknowledge support from the Spanish Ministerio de Ciencia e Innovación under grants PID2019-104714GB-C21, FPA2017-83946-C2-1-P, FIS2015-71688-ERC, CSIC for funding PIE-201750I26, and the funding agencies of the participating institutes. We would like to thank the crew at the Electronics Laboratory of IFIC, in particular Manuel Lopez Redondo and Jorge Nácher Arándiga for their excellent and efficient work.

Published
2021
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4. Probing nuclear forces beyond the nuclear drip line: the cases of $^{16}$F and $^{15}$F: A Tribute to Mahir Hussein

Author

L. Caceres, A.M. Sánchez Benítez, Igor T. Čeliković, A. Matta, D. Verney, F. Rotaru, Valdir Guimaraes, P. Adsley, O. Sorlin, J. Guillot, T. Roger, C. Portail, V. Girard-Alcindor, I. Matea, A. Georgiadou, C. Petrone, D. Pantelica, R. Borcea, D. Suzuki, O. Kamalou, V. Lapoux, Megumi Niikura, I. Stefan, J. Piot, F. Flavigny, G. D’Agata, F. de Oliveira Santos, M. Ciemala, V. Tatischeff, V. Chudoba, L. Lalanne, C. Stodel, J. C. Thomas, N. Goyal, M. Stanoiu, C. Fougeres, S. Grévy, F. Negoita, N. de Séréville, L. Perrot, G. Dumitru, M. Assie, A. Meyer, J. C. Angelique, Marlete Assunção, Nicolas Michel, F. Hammache, D. Beaumel, S. Franchoo, Predrag Ujić, Dieter Ackermann, Shoko Koyama, F. de Grancey, J. Kiener, E. Berthoumieux, P. Morfouace, J. Mrazek, K. Subotic, Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), 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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Excited state, 0103 physical sciences, Nuclear force, Mirror nuclei, Atomic physics, 010306 general physics, Wave function, Nuclear Experiment, media_common
Abstract

The unbound proton-rich nuclei $$^{16}$$ F and $$^{15}$$ F are investigated experimentally and theoretically. Several experiments using the resonant elastic scattering method were performed at GANIL with radioactive beams to determine the properties of the low lying states of these nuclei. Strong asymmetry between $$^{16}$$ F– $$^{16}$$ N and $$^{15}$$ F– $$^{15}$$ C mirror nuclei is observed. The strength of the $$nucleon-nucleon$$ effective interaction involving the loosely bound proton in the $$s_{1/2}$$ orbit is significantly modified with respect to their mirror nuclei $$^{16}$$ N and $$^{15}$$ C. The reduction of the effective interaction is estimated by calculating the interaction energies with a schematic zero-range force. It is found that, after correcting for the effects due to changes in the radial distribution of the single-particle wave functions, the mirror symmetry of the $$n-p$$ interaction is preserved between $$^{16}$$ F and $$^{16}$$ N, while a difference of 63% is measured between the $$p-p$$ versus $$n-n$$ interactions in the second excited state of $$^{15}$$ F and $$^{15}$$ C nuclei. Several explanations are proposed.

Published
2021
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5. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels

Author

C. Petrone, C. Borcea, A. Maj, K. V. Novikov, G. N. Knyazheva, Emanuele Vardaci, V. V. Kirakosyan, A. Bracco, S. Brambilla, G. Sposito, D. Verney, I. M. Harca, D. Quero, K. Saveleva, John W. Wilson, A. Pulcini, S. Calinescu, I. V. Kolesov, M. Ciemala, O. Dorvaux, E. M. Kozulin, F. Camera, I. M. Itkis, O. Stezowski, M. Ashaduzzaman, B. de Canditiis, C. Schmitt, D. Pierroutsakou, A. Di Nitto, P. K. Rath, G. La Rana, C. Parascandolo, N. I. Kozulina, I. Matea, 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 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
[PHYS]Physics [physics], Physics, Nuclear reaction, Angular momentum, Photon, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Spectrometer, Mass distribution, 010308 nuclear & particles physics, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, Nuclear physics, 0103 physical sciences, Nuclear Reactions, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasifission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The approach proposed here relies on the fact that fusion-fission and quasifission are characterized by different timescales. Within this framework, we performed a detailed study to find out how timescales can be probed via angular momentum transfer as measured via γ-ray multiplicities. The proof of principle was carried out by measuring the γ rays in coincidence with fusion-fission and quasielastic binary fragments in the reaction S32 + Au197 at beam energy near the Coulomb barrier. The experiment was performed at the Accélérateur Linéaire Tandem à Orsay (ALTO) facility at the Institut De Physique Nucléaire (IPN) in Orsay (France) using a detection setup consisting of ORGAM (ORsay GAMma) and PARIS (Photon Array Radioactive Ion Stable beams) γ-detectors arrays coupled with the CORSET (CORrelation SETup) time-of-flight spectrometer. Results of the sensitivity of this method to distinguish reaction channels with different dynamics are discussed.

Published
2020
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6. Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward N=40 and impact on r -process reaction rates

Author

S. Giraud, Ari Jokinen, Dmitrii Nesterenko, C. Petrone, F. Nowacki, Juha Äystö, A. Khanam, P. Ascher, V. A. Rubchenya, Ilkka Pohjalainen, F. de Oliveira Santos, V. Alcindor, M. Vilen, Alfredo Poves, Iain Moore, Anu Kankainen, Tommi Eronen, Heikki Penttilä, B. Bastin, L. Canete, and A. de Roubin

Subjects
Physics, 010308 nuclear & particles physics, Nuclear structure, Mass spectrometry, 7. Clean energy, 01 natural sciences, Intruder state, Reaction rate, 13. Climate action, Yield (chemistry), 0103 physical sciences, r-process, Atomic physics, 010306 general physics, Excitation, Energy (signal processing)
Abstract

Accurate mass measurements of neutron-rich iron and cobalt isotopes $^{67}\mathrm{Fe}$ and $^{69,70}\mathrm{Co}$ have been realized with the JYFLTRAP double Penning-trap mass spectrometer. With novel ion-manipulation techniques, the masses of the $^{69,70}\mathrm{Co}$ ground states and the $1/{2}^{\ensuremath{-}}$ isomer in $^{69}\mathrm{Co}$ have been extracted for the first time. The measurements remove ambiguities in the previous mass values and yield a smoother trend on the mass surface, extending it beyond $N=40$. The moderate $N=40$ subshell gap has been found to weaken below $^{68}\mathrm{Ni}$, a region known for shape coexistence and increased collectivity. The excitation energy for the $1/{2}^{\ensuremath{-}}$ intruder state in $^{69}\mathrm{Co}$ has been determined for the first time and is compared to large-scale shell-model calculations. The new mass values also reduce significantly mass-related uncertainties for the astrophysical rapid neutron-capture process calculations.

Published
2020
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7. Review and new concepts for neutron-capture measurements of astrophysical interest

Author

M. Sabaté-Gilarte, A. Kimura, A. Segarr, J. Lerendegui-Marco, M. Krtička, T. Martinez, M. Busso, M. Mastromarco, L. Caballero, J. L. Tain, G. Tagliente, Mario Barbagallo, Z. Eleme, D. Schumann, I. Knapova, S. Bennett, B. Fernandez-Domingez, G. Vannini, P. Vaz, P. Sprung, A. Masi, F. Ogallar, A. Saxena, F. Gunsing, V. Michalopoulou, J. Heyse, A. Stamatopoulos, N. Patronis, A. Casanovas, D. G. Jenkins, Alberto Ventura, E. Jericha, E. Berthoumieux, Javier Praena, B. Thomas, A. Negret, Cristian Massimi, Alberto Mengoni, I. Ferro-Goncalves, P. J. Davies, M. A. Cortés-Giraldo, C. Rubbia, P. M. Milazzo, Paolo Finocchiaro, G. Cortes, D. R. Doval, E. Mendoza, S. Urlass, Alfredo Ferrari, J. Balibrea-Correa, J. Moreno-Soto, D. Rochman, L. Cosentino, N. V. Sosnin, A. Mazzone, M. Kokkoris, E. Maugeri, P. F. Mastinua, A. Oprea, Rene Reifarth, C. Petrone, Claudia Lederer-Woods, V. Variale, Arnd R. Junghans, P. Torres-Sanchez, A. Sekhar, M. Diakaki, U. Jiri, F. Mingrone, S. Amaducci, M. Bacak, J. M. Quesada, L. Tassan-Got, Deniz Kurtulgil, J. Andrzejewski, M. Caamaño, E. Chiaveri, V. Babiano-Suarez, D. Cano-Ott, D. Macina, F. Cerutti, V. Vlachoudis, I. Ladarescu, L. Audouin, Carlos Guerrero, L. Piersanti, A. Pavlik, A. S. Brown, R. Garg, C. Domingo-Pardo, E. González-Romero, I. Porras, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. T. Rodriguez-Gonzalez, O. Aberle, V. Furman, Y. Kopatch, A. Tsinganis, Simone Gilardoni, F. Calviño, E. Pirovano, Nicola Colonna, J. Perkowski, E. Dupont, M. A. Millán-Callado, K. Göbel, S. Cristallo, T. Wright, Diego Vescovi, F. Käppeler, A. Musumarra, R. Vlastou, Damir Bosnar, Y. Kadi, A. Manna, Q. Ducasse, S. Valenta, P. Zugec, Marco Calviani, A. G. Smith, M. Dietz, Philip Woods, Anton Wallner, P. Schillebeeckx, A. Gawlik, L. A. Damone, I. Duran, R. Dressler, V. Alcayne, 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, 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), Domingo-Pardo, C., Babiano-Suarez, V., Balibrea-Correa, J., Caballero, L., Ladarescu, I., Lerendegui-Marco, J., Tain, J. L., Calvino, F., Casanovas, A., Segarr, A., Tarifeno-Saldivia, A. E., Guerrero, C., Millan-Callado, M. A., Quesada, J. M., Rodriguez-Gonzalez, M. T., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Bacak, M., Barbagallo, M., Bennett, S., Berthoumieux, E., Bosnar, D., Brown, A. S., Busso, M., Caamano, M., Calviani, M., Cano-Ott, D., Cerutti, F., Chiaveri, E., Colonna, N., Cortes, G. P., Cortes-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Diakaki, M., Dietz, M., Dressler, R., Ducasse, Q., Dupont, E., Duran, I., Eleme, Z., Fernandez-Domingez, B., Ferrari, A., Ferro-Goncalves, I., Finocchiaro, P., Furman, V., Garg, R., Gawlik, A., Gilardoni, S., Gobel, K., Gonzalez-Romero, E., Gunsing, F., Heyse, J., Jenkins, D. G., Jericha, E., Jiri, U., Junghans, A., Kadi, Y., Kappeler, F., Kimura, A., Knapova, I., Kokkoris, M., Kopatch, Y., Krticka, M., Kurtulgil, D., Lederer-Woods, C., Lonsdale, S. -J., Macina, D., Manna, A., Martinez, T., Masi, A., Massimi, C., Mastinua, P. F., Mastromarco, M., Maugeri, E., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Ogallar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Petrone, C., Piersanti, L., Pirovano, E., Porras, I., Praena, J., Doval, D. R., Reifarth, R., Rochman, D., Rubbia, C., Sabate-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N., Sprung, P., Stamatopoulos, A., Tagliente, G., Tassan-Got, L., Thomas, B., Torres-Sanchez, P., Tsinganis, A., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T. J., Zugec, P., Domingo-Pardo C., Babiano-Suarez V., Balibrea-Correa J., Caballero L., Ladarescu I., Lerendegui-Marco J., Tain J.L., Calvino F., Casanovas A., Segarr A., Tarifeno-Saldivia A.E., Guerrero C., Millan-Callado M.A., Quesada J.M., Rodriguez-Gonzalez M.T., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A.S., Busso M., Caamano M., Calviani M., Cano-Ott D., Cerutti F., Chiaveri E., Colonna N., Cortes G.P., Cortes-Giraldo M.A., Cosentino L., Cristallo S., Damone L.A., Davies P.J., Diakaki M., Dietz M., Dressler R., Ducasse Q., Dupont E., Duran I., Eleme Z., Fernandez-Domingez B., Ferrari A., Ferro-Goncalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Gobel K., Gonzalez-Romero E., Gunsing F., Heyse J., Jenkins D.G., Jericha E., Jiri U., Junghans A., Kadi Y., Kappeler F., Kimura A., Knapova I., Kokkoris M., Kopatch Y., Krticka M., Kurtulgil D., Lederer-Woods C., Lonsdale S.-J., Macina D., Manna A., Martinez T., Masi A., Massimi C., Mastinua P.F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P.M., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Ogallar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Doval D.R., Reifarth R., Rochman D., Rubbia C., Sabate-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A.G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tassan-Got L., Thomas B., Torres-Sanchez P., Tsinganis A., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P.J., Wright T.J., and Zugec P.

Subjects
History, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Measure (physics), FOS: Physical sciences, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Education, Nuclear physics, Nucleosynthesis, 0103 physical sciences, Neutron, 14. Life underwater, Instrumentation (computer programming), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, physics.ins-det, 010303 astronomy & astrophysics, Stellar evolution, Physics, neutron capture, detector, TOF, Detector, Instrumentation and Detectors (physics.ins-det), Computer Science Applications, Progressive refinement, Neutron capture, astrophysics, neutron capture, neutron time of flight, n_TOF
Abstract

The idea of slow-neutron capture nucleosynthesis formulated in 1957 triggered a tremendous experimental effort in different laboratories worldwide to measure the relevant nuclear physics input quantities, namely (n, γ) cross sections over the stellar temperature range (from few eV up to several hundred keV) for most of the isotopes involved from Fe up to Bi. A brief historical review focused on total energy detectors will be presented to illustrate how advances in instrumentation have led to the assessment of new aspects of s-process nucleosynthesis and to the progressive refinement of stellar models. A summary will be presented on current efforts to develop new detection concepts, such as the Total-Energy Detector with γ-ray imaging capability (i-TED). The latter is based on the simultaneous combination of Compton imaging with neutron time-of-flight (TOF) techniques, in order to achieve a superior level of sensitivity and selectivity in the measurement of stellar neutron capture rates., European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Consolidator Grant project HYMNS) 681740, Instituto de Salud Carlos III Spanish Government FPA2014-52823-C2-1-P FPA2017-83946-C2-1-P, Consejo Superior de Investigaciones Cientificas (CSIC) PIE-201750I26, Program Severo Ochoa SEV-2014-0398

Published
2020
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8. First results of the 241Am(n,f) cross section measurement at the Experimental Area 2 of the n_TOF facility at CERN

Author

M. Bacak, S. Heinitz, Y. Kadi, C. Petrone, O. Aberle, M. A. Millán-Callado, J. L. Tain, G. Cortes, M. Mastromarco, Z. Eleme, G. Vannini, M. Caamaño, P. J. Davies, A. Masi, S. Valenta, B. Fernández-Domíngez, Massimo Barbagallo, Anton Wallner, A. S. Brown, D. G. Jenkins, Marco Calviani, Rene Reifarth, B. Thomas, A. G. Smith, Alexandru Negret, J. Andrzejewski, A. Oprea, L. Audouin, F. Cerutti, F. Käppeler, J. M. Quesada, L. Tassan-Got, Emilio Andrea Maugeri, Rugard Dressler, M. Dietz, P. M. Milazzo, D. Bosnar, M. Kokkoris, V. Babiano-Suarez, Sergio Cristallo, M. A. Cortés-Giraldo, V. Alcayne, C. Rubbia, A. Tsinganis, Luciano Piersanti, A. Kimura, F. Ogállar, P. J. Woods, T. Martinez, E. Jericha, Paolo Finocchiaro, A. Manna, Nicola Colonna, E. Dupont, R. Vlastou, Vasilis Vlachoudis, Y. Kopatch, Dorothea Schumann, J. Moreno-Soto, N. Patronis, A. K. Saxena, I. Ferro-Gonçalves, Simone Gilardoni, I. Duran, G. Tagliente, Q. Ducasse, Arnaud Ferrari, L. Caballero, E. Berthoumieux, I. Ladarescu, Kathrin Göbel, U. Jiri, D. Ramos Doval, Jan Heyse, E. Chiaveri, P. F. Mastinu, A. Casanovas, D. Cano-Ott, S. Urlass, S. Bennett, A. Sekhar, M. Diakaki, A. Stamatopoulos, A. Gawlik, Javier Praena, L. Cosentino, V. Furman, T. J. Wright, N. V. Sosnin, I. Knapova, P. Vaz, Annamaria Mazzone, Petar Žugec, L. A. Damone, P. Sprung, Alberto Ventura, F. Calviño, A. Pavlik, C. Domingo-Pardo, E. Pirovano, V. Michalopoulou, J. Perkowski, E. Mendoza, E. González-Romero, F. Gunsing, Peter Schillebeeckx, Cristian Massimi, A. Mengoni, D. Macina, Carlos Guerrero, R. Garg, M. Krticˇka, Claudia Lederer-Woods, P. Torres-Sánchez, Deniz Kurtulgil, M. Sabaté-Gilarte, Maurizio Busso, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, Diego Vescovi, J. Lerendegui-Marco, S. Amaducci, A. Musumarra, F. Mingrone, V. Variale, Dimitri Rochman, Arnd R. Junghans, 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, 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
Large Hadron Collider, Materials science, Nuclear transmutation, Isotope, 010308 nuclear & particles physics, n_TOF, 241Am, fission, neutron time of flight, 4. Education, Nuclear engineering, Physics, QC1-999, Radioactive waste, MicroMegas detector, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Incineration, 13. Climate action, Neutron flux, 0103 physical sciences, Nuclear Physics - Experiment, 010306 general physics
Abstract

This research is co-financed by Greece and the European Union (European Social Fund-ESF) through the Operational Programme Human Resources Development, Education and Lifelong Learning in the context of the project "Strengthening Human Resources Research Potential via Doctorate Research" (MIS-5000432), implemented by the State Scholarships Foundation (IKY). Also, the authors would like to acknowledge the support of the European Commission under the CHANDA project (7th Framework Programme)., Feasibility, design and sensitivity studies on innovative nuclear reactors that could address the issue of nuclear waste transmutation using fuels enriched in minor actinides, require high accuracy cross section data for a variety of neutron-induced reactions from thermal energies to several tens of MeV. The isotope Am-241 (T-1/2= 433 years) is present in high-level nuclear waste (HLW), representing about 1.8 % of the actinide mass in spent PWR UOx fuel. Its importance increases with cooling time due to additional production from the beta-decay of Pu-241 with a half-life of 14.3 years. The production rate of 241Am in conventional reactors, including its further accumulation through the decay of Pu-241 and its destruction through transmutation/incineration are very important parameters for the design of any recycling solution. In the present work, the Am-241(n,f) reaction cross-section was measured using Micromegas detectors at the Experimental Area 2 of the n_TOF facility at CERN. For the measurement, the U-235(n,f) and U-238(n,f) reference reactions were used for the determination of the neutron flux. In the present work an overview of the experimental setup and the adopted data analysis techniques is given along with preliminary results., European Union (European Social Fund-ESF) through the Operational Programme Human Resources Development, Education and Lifelong Learning MIS-5000432, European Commission under the CHANDA project (7th Framework Programme)

Published
2020
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9. New reaction rates for the destruction of $^7$Be during big bang nucleosynthesis measured at CERN/n_TOF and their implications on the cosmological lithium problem

Author

Z. Eleme, M. Mastromarco, Massimo Barbagallo, I. Knapova, Anton Wallner, S. Valenta, Rugard Dressler, P. Vaz, M. Krtička, Marco Calviani, A. Gawlik, G. Vannini, A. G. Smith, A. Tsinganis, T. Martinez, V. Furman, T. J. Wright, Alberto Ventura, M. Dietz, Luciano Piersanti, M. Caamaño, Nicola Colonna, P. J. Woods, I. Ladarescu, Vasilis Vlachoudis, E. González-Romero, F. Ogállar, M. Sabaté-Gilarte, P. J. Davies, N. Patronis, A. K. Saxena, Arnaud Ferrari, L. Audouin, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, G. Tagliente, D. Ramos Doval, O. Aberle, E. Chiaveri, J. Moreno-Soto, Alberto Mengoni, E. Dupont, A. Pavlik, P. Sprung, G. Cortes, P. F. Mastinu, M. A. Millán-Callado, L. A. Damone, D. Macina, Carlos Guerrero, C. Domingo-Pardo, A. Kimura, A. Casanovas, R. Garg, P. Torres-Sánchez, S. Bennett, M. Bacak, A. Stamatopoulos, A. Masi, Emilio Andrea Maugeri, L. Cosentino, J. L. Tain, D. G. Jenkins, Kathrin Göbel, Y. Kadi, F. Gunsing, I. Duran, M. Kokkoris, D. Bosnar, Jan Heyse, E. Pirovano, S. Urlass, M. A. Cortés-Giraldo, E. Jericha, Claudia Lederer-Woods, Cristian Massimi, B. Thomas, Deniz Kurtulgil, V. Alcayne, R. Vlastou, Rene Reifarth, Paolo Finocchiaro, E. Berthoumieux, Dorothea Schumann, J. M. Quesada, Y. Kopatch, L. Tassan-Got, Sergio Cristallo, C. Rubbia, Q. Ducasse, V. Michalopoulou, F. Mingrone, F. Calviño, E. Mendoza, J. Perkowski, V. Variale, Peter Schillebeeckx, Dimitri Rochman, Arnd R. Junghans, S. Heinitz, C. Petrone, I. Ferro-Gonçalves, A. S. Brown, P. M. Milazzo, B. Fernández-Domíngez, A. Oprea, Ignacio Porras, D. Cano-Ott, A. Sekhar, M. Diakaki, Maurizio Busso, Ariel Tarifeño-Saldivia, S. J. Lonsdale, J. Lerendegui-Marco, S. Amaducci, Alexandru Negret, F. Käppeler, V Babiano-Suarez, A. Manna, J. Andrzejewski, F. Cerutti, L. Caballero, Simone Gilardoni, U. Jiri, Javier Praena, Diego Vescovi, A. Musumarra, 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, 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), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ge, Z., Shu, N., Chen, Y., Wang, W., and Zhang, H.

Subjects
Physics, Range (particle radiation), Large Hadron Collider, n_TOF, 7Be, big bang nucleosynthesis, cosmological lithium problem, 010308 nuclear & particles physics, QC1-999, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Reaction rate, Nuclear physics, Big Bang nucleosynthesis, chemistry, 13. Climate action, 0103 physical sciences, Thermal, Neutron, Lithium, Nuclear Physics - Experiment, 010306 general physics, Nuclear Experiment
Abstract

New measurements of the7Be(n,α)4He and7Be(n,p)7Li reaction cross sections from thermal to keV neutron energies have been recently performed at CERN/n_TOF. Based on the new experimental results, astrophysical reaction rates have been derived for both reactions, including a proper evaluation of their uncertainties in the thermal energy range of interest for big bang nucleosynthesis studies. The new estimate of the7Be destruction rate, based on these new results, yields a decrease of the predicted cosmological7Li abundance insufficient to provide a viable solution to the cosmological lithium problem.

Published
2020
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10. Status and perspectives of the neutron time-of-flight facility n_TOF at CERN

Author

D. Bosnar, Rugard Dressler, A. Tsinganis, N. V. Sosnin, S. Bennett, A. Stamatopoulos, Luciano Piersanti, Nicola Colonna, Annamaria Mazzone, Petar Žugec, Z. Eleme, P. Sprung, F. Ogállar, A. Kimura, G. Cortes, A. Masi, V. Variale, O. Aberle, G. Tagliente, Dimitri Rochman, Arnd R. Junghans, A. Pavlik, D. Ramos Doval, D. G. Jenkins, E. Jericha, Y. Kopatch, C. Domingo-Pardo, M. A. Millán-Callado, Maurizio Busso, L. Audouin, M. Krtička, Emilio Andrea Maugeri, M. Kokkoris, Paolo Finocchiaro, Dorothea Schumann, E. Pirovano, T. Martinez, Rene Reifarth, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. A. Cortés-Giraldo, A. Casanovas, Alexandru Negret, F. Cerutti, M. Bacak, A. S. Brown, P. J. Woods, Ignacio Porras, F. Käppeler, J. Andrzejewski, I. Knapova, Y. Kadi, J. M. Quesada, D. Cano-Ott, A. Sekhar, M. Diakaki, P. Vaz, F. Gunsing, I. Ferro-Gonçalves, G. Vannini, L. Cosentino, V. Vlachoudis, F. Mingrone, Cristian Massimi, L. Tassan-Got, Simone Gilardoni, N. Patronis, Sergio Cristallo, A. K. Saxena, Arnaud Ferrari, Alberto Mengoni, I. Ladarescu, Diego Vescovi, V. Furman, T. J. Wright, Claudia Lederer-Woods, M. Caamaño, V. Michalopoulou, E. Mendoza, B. Fernández-Domíngez, A. Oprea, Alberto Ventura, P. M. Milazzo, J. Lerendegui-Marco, S. Amaducci, U. Jiri, L. Caballero, Peter Schillebeeckx, Kathrin Göbel, Deniz Kurtulgil, J. Moreno-Soto, R. Vlastou, E. Berthoumieux, P. J. Davies, Jan Heyse, A. Musumarra, E. Chiaveri, F. Calviño, P. F. Mastinu, C. Rubbia, J. Perkowski, Javier Praena, S. Heinitz, C. Petrone, Q. Ducasse, J. L. Tain, D. Macina, Carlos Guerrero, S. Valenta, R. Garg, Marco Calviani, A. G. Smith, M. Dietz, S. Urlass, V. Babiano-Suarez, A. Manna, A. Gawlik, E. González-Romero, P. Torres-Sánchez, M. Mastromarco, Massimo Barbagallo, Anton Wallner, M. Sabaté-Gilarte, I. Duran, L. A. Damone, B. Thomas, V. Alcayne, E. Dupont, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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), Ge, Z., Shu, N., Chen, Y., Wang, W., and Zhang, H.

Subjects
Large Hadron Collider, Computer science, Physics, QC1-999, 020209 energy, Nuclear engineering, Nuclear Theory, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron temperature, Nuclear technology, Upgrade, Neutron flux, 0103 physical sciences, n_TOF, CERN, neutron time of flight, 0202 electrical engineering, electronic engineering, information engineering, Neutron cross section, Nuclear astrophysics, Nuclear Physics - Experiment, Neutron, 010306 general physics, Nuclear Experiment
Abstract

International audience; Since the start of its operation in 2001, based on an idea of Prof. Carlo Rubbia [1], the neutron time of-flight facility of CERN, n_TOF, has become one of the most forefront neutron facilities in the world for wide-energy spectrum neutron cross section measurements. Thanks to the combination of excellent neutron energy resolution and high instantaneous neutron flux available in the two experimental areas, the second of which has been constructed in 2014, n_TOF is providing a wealth of new data on neutron-induced reactions of interest for nuclear astrophysics, advanced nuclear technologies and medical applications. The unique features of the facility will continue to be exploited in the future, to perform challenging new measurements addressing the still open issues and long-standing quests in the field of neutron physics. In this document the main characteristics of the n_TOF facility and their relevance for neutron studies in the different areas of research will be outlined, addressing the possible future contribution of n_TOF in the fields of nuclear astrophysics, nuclear technologies and medical applications. In addition, the future perspectives of the facility will be described including the upgrade of the spallation target, the setup of an imaging installation and the construction of a new irradiation area.

Published
2020
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11. Features of the Fission Fragments Formed in the Heavy Ion induced $^{32}\hbox {S}$+$^{197}\hbox {Au}$ reaction near the interaction barrier

Author

G. N. Knyazheva, Emanuele Vardaci, O. Dorvaux, P.K. Rath, D. Verney, E. M. Kozulin, B. Decanditiis, S. Brambilla, E. Saveleva, D. Quero, G. La Rana, J. N. Wilson, S. Calinescu, N. I. Kozulina, C. Schmitt, I. M. Itkis, F. Camera, A. Bracco, K. V. Novikov, W. H. Trzaska, O. Stezowski, I. Matea, A. Pulcini, I. M. Harca, A. Di Nitto, M. Ciemala, V. V. Kirakosyan, C. Petrone, M. Ashaduzzaman, I. V. Kolesov, C. Borcea, A. Maj, 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 Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), SPS, PARIS, 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Harca, I. M., Vardaci, E., Matea, I., Maj, A., Itkis, I., Knyazheva, G., Novikov, K., Dorvaux, O., Ciemala, M., Brambilla, S., Kozulina, N., Kolesov, I. V., Saveleva, E., Kirakosyan, V. V., Schmitt, C., Borcea, C., Calinescu, S., Petrone, C., Ashaduzzaman, M., Decanditiis, B., Pulcini, A., Quero, D., Rath, P., di Nitto, A., La Rana, G., Bracco, A., Camera, F., Stezowski, O., Wilson, J., Verney, D., and Trzaska, W. H.

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Semi-empirical mass formula, Yield (chemistry), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract

International audience; The features of fission fragments formed in the near barrier reaction $^{32}\hbox {S}$ + $^{197}\hbox {Au}$ ($E^\mathrm{lab}_\mathrm{beam}=166\,\hbox {MeV}$) are investigated. The measurement was performed at the ALTO facility of IPN Orsay, France, with the aim of clarifying the quantitative contribution of the quasi-fission process to the total fission events. The mass and total kinetic energy of the fission fragments were compared to the expectations of the liquid drop model, revealing an asymmetric fission component which may be traced back to a quasi-fission process mixed with the fusion–fission events. The $\gamma $-rays and neutrons measured in coincidence with the fission fragments were used to yield additional information for the discrimination of the two aforementioned mechanisms. All observed trends are consistent and fairly well reproduced by the statistical model.

Published
2020
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12. Monte Carlo simulations and n-p differential scattering data measured with Proton Recoil Telescopes

Author

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

The authors wish to thank the National Center of the INFN for Research and Development in Information and Communication Technologies (CNAF) for their computational support., The neutron-induced fission cross section of U-235, a standard at thermal energy and between 0.15 MeV and 200 MeV, plays a crucial role in nuclear technology applications. The long-standing need of improving cross section data above 20 MeV and the lack of experimental data above 200 MeV motivated a new experimental campaign at the n_TOF facility at CERN. The measurement has been performed in 2018 at the experimental area 1 (EAR1), located at 185 m from the neutron-producing target (the experiment is presented by A. Manna et al. in a contribution to this conference). The U-235(n,f) cross section from 20 MeV up to about 1 GeV has been measured relative to the H-1(n,n)H-1 reaction, which is considered the primary reference in this energy region. The neutron flux impinging on the U-235 sample (a key quantity for determining the fission events) has been obtained by detecting recoil protons originating from n-p scattering in a C2H4 sample. Two Proton Recoil Telescopes (PRT), consisting of several layers of solid-state detectors and fast plastic scintillators, have been located at proton scattering angles of 25.07 degrees and 20.32 degrees, out of the neutron beam. The PRTs exploit the Delta E-E technique for particle identification, a basic requirement for the rejection of charged particles from neutron-induced reactions in carbon. Extensive Monte Carlo simulations were performed to characterize proton transport through the different slabs of silicon and scintillation detectors, to optimize the experimental set-up and to deduce the efficiency of the whole PRT detector. In this work we compare measured data collected with the PRTs with a full Monte Carlo simulation based on the Geant-4 toolkit.

Published
2020
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13. First results of the Th-230(n,f) cross section measurements at the CERN n_TOF facility

Author

P. Torres-Sánchez, A. Mengoni, F. Ogállar, M. Mastromarco, Massimo Barbagallo, Anton Wallner, N. V. Sosnin, G. Tagliente, Rugard Dressler, A. Musumarra, Annamaria Mazzone, G. Cortes, I. Ferro-Gonçalves, P. J. Woods, D. Ramos Doval, Y. Kopatch, M. Sabaté-Gilarte, A. Oprea, A. Pavlik, Petar Žugec, P. Sprung, A. Tsinganis, C. Domingo-Pardo, N. Patronis, A. K. Saxena, Simone Gilardoni, L. Audouin, J. L. Tain, Luciano Piersanti, M. A. Cortés-Giraldo, Arnaud Ferrari, Alexandru Negret, E. Chiaveri, Nicola Colonna, F. Käppeler, P. F. Mastinu, A. Casanovas, Vasilis Vlachoudis, I. Ladarescu, E. Pirovano, U. Jiri, A. Kimura, E. Dupont, O. Aberle, S. Urlass, G. Vannini, M. A. Millán-Callado, S. Bennett, V. Variale, V. Babiano-Suarez, Dimitri Rochman, Arnd R. Junghans, J. Andrzejewski, A. Gawlik, B. Femández-Domíngez, A. Stamatopoulos, L. Cosentino, M. Caamaño, R. Vlastou, V. Michalopoulou, Maurizio Busso, Y. Kadi, E. Jericha, E. Berthoumieux, P. J. Davies, Emilio Andrea Maugeri, E. Mendoza, Z. Eleme, Paolo Finocchiaro, L. A. Damone, I. Knapova, Dorothea Schumann, M. Kokkoris, Javier Praena, A. Manna, Peter Schillebeeckx, Claudia Lederer-Woods, Rene Reifarth, P. Vaz, Deniz Kurtulgil, M. Bacak, B. Thomas, J. Moreno-Soto, A. S. Brown, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Calviño, Kathrin Göbel, A. Masi, I. Duran, Alberto Ventura, L. Caballero, M. Krtiička, C. Rubbia, E. González-Romero, J. Perkowski, V. Furman, T. J. Wright, F. Cerutti, D. G. Jenkins, S. Heinitz, Jan Heyse, D. Bosnar, C. Petrone, F. Gunsing, Ignacio Porras, V. Alcayne, D. Macina, Carlos Guerrero, Q. Ducasse, D. Cano-Ott, A. Sekhar, M. Diakaki, P. M. Milazzo, J. M. Quesada, T. Martinez, R. Garg, Cristian Massimi, S. Valenta, L. Tassan-Got, Marco Calviani, A. G. Smith, M. Dietz, Sergio Cristallo, F. Mingrone, J. Lerendegui-Marco, S. Amaducci, Diego Vescovi, 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, 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, Ge, Z., Shu, N., Chen, Y., Wang, W., and Zhang, H.

Subjects
Physics, Range (particle radiation), n_TOF, 230Th, fission, neutron time of flight, Large Hadron Collider, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, MicroMegas detector, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Nuclear physics, Cross section (physics), 0103 physical sciences, Nuclear Physics - Experiment, 010306 general physics
Abstract

The study of neutron-induced reactions on actinides is of considerable importance for the design of advanced nuclear systems and alternative fuel cycles. Specifically, 230Th is produced from the α-decay of 234U as a byproduct of the 232Th/233U fuel cycle, thus the accurate knowledge of its fission cross section is strongly required. However, few experimental datasets exist in literature with large deviations among them, covering the energy range between 0.2 to 25 MeV. In addition, the study of the 230Th(n,f) cross-section is of great interest in the research on the fission process related to the structure of the fission barriers. Previous measurements have revealed a large resonance at En=715 keV and additional fine structures, but with high discrepancies among the cross-section values of these measurements. This contribution presents preliminary results of the 230Th(n,f) cross-section measurements at the CERN n_TOF facility. The high purity targets of the natural, but very rare isotope 230Th, were produced at JRC-Geel in Belgium. The measurements were performed at both experimental areas (EAR-1 and EAR-2) of the n_TOF facility, covering a very broad energy range from thermal up to at least 100 MeV. The experimental setup was based on Micromegas detectors with the 235U(n,f) and 238U(n,f) reaction cross-sections used as reference.

Published
2020
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14. $^{80}$Se(n,$\gamma$) cross-section measurement at CERN n_TOF

Author

I. Knapova, P. Vaz, F. Mingrone, E. Jericha, J. Andrzejewski, Luis Caballero, Paolo Finocchiaro, A. Gawlik, F. Ogállar, V. Vlachoudis, G. Tagliente, D. Ramos Doval, G. Vannini, F. Gunsing, Javier Praena, J. L. Tain, Cristian Massimi, F. Calviño, J. Perkowski, Alberto Ventura, M. Sabaté-Gilarte, Z. Eleme, A. Casanovas, Emilio Andrea Maugeri, E. Mendoza, V. Variale, Dimitri Rochman, Arnd R. Junghans, Rene Reifarth, M. Kokkoris, Y. Kopatch, Carlos Guerrero, L. Cosentino, S. Heinitz, A. Tsinganis, J. Lerendegui-Marco, S. Amaducci, R. Garg, J. M. Quesada, L. Tassan-Got, P. J. Davies, A. Kimura, Diego Vescovi, C. Petrone, Luciano Piersanti, Sergio Cristallo, E. González-Romero, Alfredo Ferrari, Nicola Colonna, E. Chiaveri, G. Cortes, M. A. Cortés-Giraldo, D. Cano-Ott, M. Caamaño, O. Aberle, I. Ferro-Gonçalves, P. J. Woods, E. Dupont, J. Balibrea-Correa, D. Macina, S. Valenta, F. Cerutti, A. Sekhar, M. Diakaki, P. M. Milazzo, Pierfrancesco Mastinu, A. S. Brown, A. Pavlik, N. Patronis, C. Domingo-Pardo, M. Bacak, A. Musumarra, M. A. Millán-Callado, Marco Calviani, P. Schillebeeckx, Mario Barbagallo, B. Fernández-Domíngez, A. G. Smith, D. Schumann, Ignacio Porras, C. Rubbia, Simone Gilardoni, S. Urlass, P. Torres-Sánchez, Alberto Mengoni, I. Ladarescu, A. Oprea, J. Heyse, M. Dietz, M. Mastromarco, U. Jiri, Q. Ducasse, A. Saxena, V. Michalopoulou, K. Göbel, Anton Wallner, S. Bennett, A. Masi, A. Stamatopoulos, T. Wright, J. Moreno-Soto, D. G. Jenkins, I. Duran, Maurizio Busso, R. Vlastou, R. Dressler, Damir Bosnar, Y. Kadi, Ariel Tarifeño-Saldivia, S. J. Lonsdale, L. A. Damone, M. Krtička, T. Martinez, E. Berthoumieux, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, P. Sprung, Alexandru Negret, F. Käppeler, E. Pirovano, V. Babiano-Suarez, A. Manna, V. Furman, B. Thomas, V. Alcayne, L. Audouin, Claudia Lederer-Woods, Deniz Kurtulgil, 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, European Research Council (ERC) 681740, Babiano-Suarez V., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Bacak M., Balibrea-Correa J., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A.S., Busso M., Caamao M., Caballero L., Calviani M., Calvio F., Cano-Ott D., Casanovas A., Cerutti F., Chiaveri E., Colonna N., Cortes G.P., Cortes-Giraldo M.A., Cosentino L., Cristallo S., Damone L.A., Davies P.J., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Ducasse Q., Dupont E., Durn I., Eleme Z., Fernndez-Domingez B., Ferrari A., Ferro-Goncalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Gobel K., Gonzlez-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D.G., Jericha E., Jiri U., Junghans A., Kadi Y., Kappeler F., Kimura A., Knapov I., Kokkoris M., Kopatch Y., Krticka M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lonsdale S.-J., Macina D., Manna A., Martinez T., Masi A., Massimi C., Mastinu P.F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P.M., Milln-Callado M.A., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Ogllar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J.M., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabate-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A.G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeo-Saldivia A.E., Tassan-Got L., Thomas B., Torres-Snchez P., Tsinganis A., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P.J., Wright T.J., Zugec P., Babiano-Suarez, V., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Bacak, M., Balibrea-Correa, J., Barbagallo, M., Bennett, S., Berthoumieux, E., Bosnar, D., Brown, A. S., Busso, M., Caamao, M., Caballero, L., Calviani, M., Calvio, F., Cano-Ott, D., Casanovas, A., Cerutti, F., Chiaveri, E., Colonna, N., Cortes, G. P., Cortes-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Ducasse, Q., Dupont, E., Durn, I., Eleme, Z., Fernndez-Domingez, B., Ferrari, A., Ferro-Goncalves, I., Finocchiaro, P., Furman, V., Garg, R., Gawlik, A., Gilardoni, S., Gobel, K., Gonzlez-Romero, E., Guerrero, C., Gunsing, F., Heinitz, S., Heyse, J., Jenkins, D. G., Jericha, E., Jiri, U., Junghans, A., Kadi, Y., Kappeler, F., Kimura, A., Knapov, I., Kokkoris, M., Kopatch, Y., Krticka, M., Kurtulgil, D., Ladarescu, I., Lederer-Woods, C., Lerendegui-Marco, J., Lonsdale, S. -J., Macina, D., Manna, A., Martinez, T., Masi, A., Massimi, C., Mastinu, P. F., Mastromarco, M., Maugeri, E., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Milln-Callado, M. A., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Ogllar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Petrone, C., Piersanti, L., Pirovano, E., Porras, I., Praena, J., Quesada, J. M., Ramos Doval, D., Reifarth, R., Rochman, D., Rubbia, C., Sabate-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeo-Saldivia, A. E., Tassan-Got, L., Thomas, B., Torres-Snchez, P., Tsinganis, A., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T. J., and Zugec, P.

Subjects
Physics, History, Large Hadron Collider, Isotope, General Physics and Astronomy, 80Se, neutron capture, neutron time of flight, n_TOF, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Nuclear physics, s process, neutron physics, Time of flight, Nucleosynthesis, 0103 physical sciences, Neutron cross section, Radiative transfer, Nuclear Physics - Experiment, Slow neutron, 010306 general physics, s-process, 010303 astronomy & astrophysics
Abstract

Radiative neutron capture cross section measurements are of fundamental importance for the study of the slow neutron capture (s-) process of nucleosynthesis. This mechanism is responsible for the formation of most elements heavier than iron in the Universe. Particularly relevant are branching nuclei along the s-process path, which are sensitive to the physical conditions of the stellar environment. One such example is the branching at 79Se (3.27 × 105 y), which shows a thermally dependent β-decay rate. However, an astrophysically consistent interpretation requires also the knowledge of the closest neighbour isotopes involved. In particular, the 80Se(n,γ) cross section directly affects the stellar yield of the “cold” branch leading to the formation of the s-only 82Kr. Experimentally, there exists only one previous measurement on 80Se using the time of flight (TOF) technique. However, the latter suffers from some limitations that are described in this presentation. These drawbacks have been significantly improved in a recent measurement at CERN n TOF. This contribution presents a summary of the latter measurement and the status of the data analysis.

Published
2019
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15. 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
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16. 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
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17. Fission program at n_TOF

Author

A. Musumarra, E. Dupont, J. Lerendegui-Marco, S. Amaducci, M. A. Cortés-Giraldo, I. Ferro-Gonçalves, J. Moreno-Soto, B. Fernández-Domíngez, A. Oprea, A. Kimura, T. Martinez, A. Mengoni, Z. Eleme, M. Bacak, J. Andrzejewski, Emilio Andrea Maugeri, D. Cano-Ott, A. Sekhar, M. Diakaki, A. Pavlik, M. Kokkoris, Alexandru Negret, Diego Vescovi, Kathrin Göbel, C. Domingo-Pardo, I. Duran, C. Rubbia, F. Käppeler, L. Caballero, M. Sabaté-Gilarte, Simone Gilardoni, V. Variale, Dimitri Rochman, Arnd R. Junghans, Rugard Dressler, Jan Heyse, G. Cortes, Maurizio Busso, A. Masi, A. Gawlik, Y. Kopatch, V. Babiano-Suarez, Q. Ducasse, Ariel Tarifeño-Saldivia, S. J. Lonsdale, D. G. Jenkins, L. Cosentino, A. Tsinganis, Luciano Piersanti, Nicola Colonna, Ignacio Porras, Vasilis Vlachoudis, J. L. Tain, E. Chiaveri, U. Jiri, P. F. Mastinu, V. Furman, T. J. Wright, B. Thomas, D. Bosnar, Y. Kadi, Rene Reifarth, G. Vannini, V. Alcayne, E. González-Romero, L. A. Damone, O. Aberle, D. Macina, M. Caamaño, Carlos Guerrero, N. V. Sosnin, A. Manna, M. A. Millán-Callado, Javier Praena, R. Garg, M. Krticˇka, Annamaria Mazzone, Petar Žugec, S. Valenta, F. Ogállar, P. J. Davies, F. Mingrone, S. Bennett, G. Tagliente, P. Sprung, Marco Calviani, D. Ramos Doval, A. Stamatopoulos, J. M. Quesada, F. Gunsing, L. Tassan-Got, P. Torres-Sánchez, A. G. Smith, S. Urlass, M. Mastromarco, M. Dietz, A. Casanovas, Cristian Massimi, F. Cerutti, Sergio Cristallo, Massimo Barbagallo, Claudia Lederer-Woods, Anton Wallner, E. Pirovano, Deniz Kurtulgil, I. Knapova, S. Heinitz, P. Vaz, C. Petrone, R. Vlastou, E. Berthoumieux, F. Calviño, J. Perkowski, Alberto Ventura, P. J. Woods, N. Patronis, A. K. Saxena, Arnaud Ferrari, I. Ladarescu, L. Audouin, V. Michalopoulou, E. Mendoza, Peter Schillebeeckx, A. S. Brown, P. M. Milazzo, Paolo Finocchiaro, Dorothea Schumann, 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, 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), 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, 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
Nuclear reaction, Fission, QC1-999, Nuclear Theory, Nuclear physics, 01 natural sciences, Plutonium-240, 0103 physical sciences, Plutonium-242, CERN, Neutron, n_TOF, Neutron captures, n_TOF, Fission, r-process, 010306 general physics, Nuclear Experiment, Physics, [PHYS]Physics [physics], Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], Cross section, Neutron captures, 010308 nuclear & particles physics, r-process, Neutron radiation, Neutron capture, n_TOF, fission program, cross section measurements, Física nuclear, Other
Abstract

Since its start in 2001 the n_TOF collaboration developed a measurement program on fission, in view of advanced fuels in new generation reactors. A special effort was made on measurement of cross sections of actinides, exploiting the peculiarity of the n_TOF neutron beam which spans a huge energy domain, from the thermal region up to GeV. Moreover fission fragment angular distributions have also been measured. An overview of the cross section results achieved with different detectors is presented, including a discussion of the 237Np case where discrepancies showed up between different detector systems. The results on the anisotropy of the fission fragments and its implication on the mechanism of neutron absorption, and in applications, are also shown.

Published
2019
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18. Generalized Harmonic Analysis of Computed and Measured Magnetic Fields

Author

Bernhard Auchmann, Stephan Russenschuck, Stefan Kurz, and C. Petrone

Subjects
010302 applied physics, Physics, Magnetic domain, Field (physics), 010308 nuclear & particles physics, Force between magnets, 01 natural sciences, Magnetic flux, Electronic, Optical and Magnetic Materials, Computational physics, Magnetic field, Harmonic analysis, Classical mechanics, Magnet, 0103 physical sciences, Electrical and Electronic Engineering, Multipole expansion
Abstract

In this paper, we present a generalized approach for the harmonic analysis of the magnetic field in accelerator magnets. This analysis is based on the covariant components of the computed or measured magnetic flux density. The multipole coefficients obtained in this way can be used for magnet optimization and field reconstruction in the interior of circular and elliptical boundaries in the bore of straight magnets.

Published
2016
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19. Neutron capture measurement at the n TOF facility of the 204Tl and 205Tl s-process branching points

Author

Luis Caballero, V. Michalopoulou, S. Urlass, Maurizio Busso, I. Duran, A. Masi, E. Mendoza, D. Macina, Carlos Guerrero, R. Garg, A. S. Brown, A. Musumarra, Claudia Lederer-Woods, D. G. Jenkins, G. Cortes, Peter Schillebeeckx, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Emilio Andrea Maugeri, U Koester, Deniz Kurtulgil, E. Dupont, I. Ferro-Gonçalves, M. Kokkoris, A. Pavlik, C. Domingo-Pardo, Ignacio Porras, L. Cosentino, A. Kimura, B. Fernández-Domíngez, P. M. Milazzo, M. Mastromarco, F. Mingrone, M. A. Cortés-Giraldo, D. Bosnar, Y. Kopatch, P. J. Woods, G. Vannini, S. Bennett, J Balibrea, J. Lerendegui-Marco, J. Andrzejewski, Massimo Barbagallo, S. Amaducci, A. Stamatopoulos, F. Ogállar, N. Patronis, A. K. Saxena, A. Oprea, M. Caamaño, E. Jericha, I. Knapova, Paolo Finocchiaro, Anton Wallner, Z. Eleme, Arnaud Ferrari, G. Tagliente, V. Vlachoudis, D. Ramos Doval, B. Thomas, P. Vaz, Dorothea Schumann, Alberto Mengoni, I. Ladarescu, Alberto Ventura, L. A. Damone, P. J. Davies, O. Aberle, V. Variale, Dimitri Rochman, Arnd R. Junghans, M. A. Millán-Callado, A. Casanovas, V. Alcayne, Rene Reifarth, A. Gawlik, S. Heinitz, C. Petrone, F. Gunsing, Diego Vescovi, J. M. Quesada, L. Tassan-Got, Cristian Massimi, Y. Kadi, E. González-Romero, Sergio Cristallo, S. Valenta, Marco Calviani, A. G. Smith, P. Torres-Sánchez, M. Dietz, M. Sabaté-Gilarte, J. Moreno-Soto, D. Cano-Ott, A. Sekhar, M. Diakaki, M. Krtička, T. Martinez, E. Chiaveri, P. F. Mastinu, Kathrin Göbel, Jan Heyse, L. Audouin, M. Bacak, Rugard Dressler, A. Tsinganis, Luciano Piersanti, Nicola Colonna, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, P. Sprung, E. Pirovano, R. Vlastou, E. Berthoumieux, V. Furman, T. J. Wright, Simone Gilardoni, U. Jiri, F. Cerutti, F. Calviño, J. Perkowski, Javier Praena, Alexandru Negret, F. Käppeler, V. Babiano-Suarez, A. Manna, J. L. Tain, C. Rubbia, Q. Ducasse, Casanovas, A., Tarifeo-Saldivia, A. E., Domingo-Pardo, C., Calvio, F., Maugeri, E., Guerrero, C., Lerendegui-Marco, J., Dressler, R., Heinitz, S., Schumann, D., Tain, J. L., Quesada, J. M., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Babiano-Suarez, V., Bacak, M., Balibrea, J., Barbagallo, M., Bennett, S., Berthoumieux, E., Bosnar, D., Brown, A. S., Busso, M., Caamao, M., Caballero, L., Calviani, M., Cano-Ott, D., Cerutti, F., Chiaveri, E., Colonna, N., Cortes, G. P., Cortes-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Diakaki, M., Dietz, M., Ducasse, Q., Dupont, E., Durn, I., Eleme, Z., Fernndez-Domingez, B., Ferrari, A., Ferro-Goncalves, I., Finocchiaro, P., Furman, V., Garg, R., Gawlik, A., Gilardoni, S., Gobel, K., Gonzlez-Romero, E., Gunsing, F., Heyse, J., Jenkins, D. G., Jericha, E., Jiri, U., Junghans, A., Kadi, Y., Kappeler, F., Kimura, A., Knapov, I., Kokkoris, M., Kopatch, Y., Krticka, M., Kurtulgil, D., Ladarescu, I., Lederer-Woods, C., Lonsdale, S. -J., Macina, D., Manna, A., Martinez, T., Masi, A., Massimi, C., Mastinu, P. F., Mastromarco, M., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Milln-Callado, M. A., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Ogllar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Petrone, C., Piersanti, L., Pirovano, E., Porras, I., Praena, J., Ramos Doval, D., Reifarth, R., Rochman, D., Rubbia, C., Sabate-Gilarte, M., Saxena, A., Schillebeeckx, P., Sekhar, A., Smith, A. G., Sosnin, N., Sprung, P., Stamatopoulos, A., Tagliente, G., Tassan-Got, L., Thomas, B., Torres-Snchez, P., Tsinganis, A., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T. J., Zugec, P., Koester, U., 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), 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), ILL, Casanovas A., Tarifeo-Saldivia A.E., Domingo-Pardo C., Calvio F., Maugeri E., Guerrero C., Lerendegui-Marco J., Dressler R., Heinitz S., Schumann D., Tain J.L., Quesada J.M., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V., Bacak M., Balibrea J., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A.S., Busso M., Caamao M., Caballero L., Calviani M., Cano-Ott D., Cerutti F., Chiaveri E., Colonna N., Cortes G.P., Cortes-Giraldo M.A., Cosentino L., Cristallo S., Damone L.A., Davies P.J., Diakaki M., Dietz M., Ducasse Q., Dupont E., Durn I., Eleme Z., Fernndez-Domingez B., Ferrari A., Ferro-Goncalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Gobel K., Gonzlez-Romero E., Gunsing F., Heyse J., Jenkins D.G., Jericha E., Jiri U., Junghans A., Kadi Y., Kappeler F., Kimura A., Knapov I., Kokkoris M., Kopatch Y., Krticka M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lonsdale S.-J., Macina D., Manna A., Martinez T., Masi A., Massimi C., Mastinu P.F., Mastromarco M., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P.M., Milln-Callado M.A., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Ogllar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabate-Gilarte M., Saxena A., Schillebeeckx P., Sekhar A., Smith A.G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tassan-Got L., Thomas B., Torres-Snchez P., Tsinganis A., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P.J., Wright T.J., Zugec P., and Koester U.

Subjects
History, Electron density, Nuclear Theory, General Physics and Astronomy, Natural abundance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010502 geochemistry & geophysics, 01 natural sciences, Education, Nuclear physics, Nucleosynthesis, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, ddc:530, Nuclear Physics - Experiment, Nuclear Experiment, 010306 general physics, neutron physics, n_TOF, s process nucleosynthesis, 0105 earth and related environmental sciences, Physics, Isotope, Nuclear data, 204Tl, 205Tl, neutron capture, neutron time of flight, n_TOF, Computer Science Applications, Neutron capture, Isotopes of lead, s-process
Abstract

Neutron capture cross sections are one of the fundamental nuclear data in the study of the s (slow) process of nucleosynthesis. More interestingly, the competition between the capture and the decay rates in some unstable nuclei determines the local isotopic abundance pattern. Since decay rates are often sensible to temperature and electron density, the study of the nuclear properties of these nuclei can provide valuable constraints to the physical magnitudes of the nucleosynthesis stellar environment. Here we report on the capture cross section measurement of two thallium isotopes, 204Tl and 205Tl performed by the time-of-flight technique at the n TOF facility at CERN. At some particular stellar s-process environments, the decay of both nuclei is strongly enhanced, and determines decisively the abundance of two s-only isotopes of lead, 204Pb and 205Pb. The latter, as a long-lived radioactive nucleus, has potential use as a chronometer of the last s-process events that contributed to final solar isotopic abundances.

Published
2020
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20. Setup for the measurement of the 235U(n, f) cross section relative to n-p scattering up to 1 GeV

Author

B. Thomas, N. V. Sosnin, Annamaria Mazzone, Petar Žugec, P. Sprung, M. Bacak, V. Alcayne, Ignacio Porras, M. Krtiička, O. Aberle, A. S. Brown, M. A. Millán-Callado, G. Cortes, V. Variale, Dimitri Rochman, E. Pirovano, Arnd R. Junghans, F. Ogállar, A. Mengoni, G. Tagliente, J. Perkowski, M. Sabaté-Gilarte, J. Andrzejewski, J. Lerendegui-Marco, L. Caballero, S. Amaducci, D. Cano-Ott, P. M. Milazzo, I. Duran, A. Sekhar, M. Diakaki, R. Vlastou, E. Berthoumieux, Y. Kopatch, B. Fernández-Domíngez, E. Dupont, F. Mingrone, A. Casanovas, E. Jericha, Rugard Dressler, A. Oprea, D. Macina, Carlos Guerrero, G. Vannini, Paolo Finocchiaro, L. Cosentino, Dorothea Schumann, S. Bennett, P. Torres-Sánchez, A. Tsinganis, I. Knapova, Alexandru Negret, R. Garg, A. Stamatopoulos, M. Caamaño, S. Heinitz, F. Gunsing, M. Mastromarco, Luciano Piersanti, Nicola Colonna, P. Vaz, Massimo Barbagallo, Cristian Massimi, F. Käppeler, Vasilis Vlachoudis, Anton Wallner, Claudia Lederer-Woods, C. Petrone, P. J. Davies, Maurizio Busso, V. Furman, T. J. Wright, V. Michalopoulou, I. Ferro-Gonçalves, Z. Eleme, Deniz Kurtulgil, Ralf Nolte, Fño Calvi, Alberto Ventura, Emilio Andrea Maugeri, V-Suarez Babiano, E. Mendoza, A. Gawlik, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Peter Schillebeeckx, L. A. Damone, M. Kokkoris, S. Urlass, Rene Reifarth, E. González-Romero, A. Pavlik, C. Domingo-Pardo, D. Ramos, A. Manna, P. J. Woods, N. Patronis, A. K. Saxena, Arnaud Ferrari, I. Ladarescu, J. M. Quesada, L. Tassan-Got, D. Bosnar, Sergio Cristallo, S. Valenta, Marco Calviani, A. G. Smith, M. Dietz, J. Moreno-Soto, Y. Kadi, Simone Gilardoni, U. Jiri, F. Cerutti, Javier Praena, A. Kimura, J. L. Tain, M. A. Cortés-Giraldo, A. Musumarra, T. Martinez, C. Rubbia, E. Chiaveri, P. F. Mastinu, A. Masi, Diego Vescovi, D. G. Jenkins, Q. Ducasse, Kathrin Göbel, Jan Heyse, L. Audouin, 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, Ge, Z., Shu, N., Chen, Y., Wang, W., and Zhang, H.

Subjects
Physics, High energy, Range (particle radiation), 010308 nuclear & particles physics, Scattering, Fission, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Detector, n_TOF, 235U, fission, neutron time of flight, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Cross section (physics), Neutron flux, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, Nuclear Experiment, 010306 general physics
Abstract

The neutron induced fission of 235U is extensively used as a reference for neutron fluence measurements in various applications, ranging from the investigation of the biological effectiveness of high energy neutrons, to the measurement of high energy neutron cross sections of relevance for accelerator driven nuclear systems. Despite its widespread use, no data exist on neutron induced fission of 235U above 200 MeV. The neutron facility n_TOF offers the possibility to improve the situation. The measurement of 235U(n,f) relative to the differential n-p scattering cross-section, was carried out in September 2018 with the aim of providing accurate and precise cross section data in the energy range from 10 MeV up to 1 GeV. In such measurements, Recoil Proton Telescopes (RPTs) are used to measure the neutron flux while the fission events are detected and counted with dedicated detectors. In this paper the measurement campaign and the experimental set-up are illustrated.

Published
2020
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21. 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
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22. Gamma rays as probe of fission and quasi-fission dynamics in the reaction 32S + 197Au near the Coulomb barrier

Author

A. Bracco, E. M. Kozulin, B. de Canditiis, Wladyslaw Henryk Trzaska, I. M. Itkis, C. Petrone, Emanuele Vardaci, V. V. Kirakosyan, P. K. Rath, I. M. Harca, I. Matea, G. Sposito, S. Calinescu, O. Stezowski, C. Schmitt, A. Pulcini, D. Quero, James R. Wilson, N. I. Kozulina, G. La Rana, E. Saveleva, G. N. Knyazheva, K. V. Novikov, S. Brambilla, F. Camera, I. V. Kolesov, M. Ciemala, M. Ashaduzzaman, O. Dorvaux, C. Borcea, A. Maj, Giuseppe Mandaglio, Antonio Trifirò, Marina Trimarchi, Pulcini, A., Vardaci, E., Kozulin, E., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., De Canditiis, Bartolomeo, Dorvaux, O., Harca, I. M., Itkis, I., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., 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), 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), 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), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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)-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)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Mandaglio, Giuseppe, Trifirò, Antonio, and Trimarchi, Marina

Subjects
Physics, History, Angular momentum, Spectrometer, 010308 nuclear & particles physics, Fission, Detector, gamma radiation, Gamma ray, Coulomb barrier, gammasäteily, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Computer Science Applications, Education, Nuclear physics, nuclear fission, fissio, nuclear physics, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, ydinfysiikka, Nuclear Experiment
Abstract

International audience; Compound nucleus fission and quasi-fission are both binary decay channels whose common properties make the experimental separation between them difficult. A way to achieve this separation could be to probe the angular momentum of the binary fragments. This can be done detecting gamma rays in coincidence with the two fragments. As a case study, the reaction 32S + 197Au near the Coulomb barrier has been performed at the Tandem ALTO facility at IPN ORSAY. ORGAM and PARIS, two different gamma detectors arrays, are coupled with the CORSET detector, a two-arm time-of-flight spectrometer. TOF-TOF data were analyzed to reconstruct the mass-energy distribution of the primary fragments coupled with gamma multiplicity and spectroscopic analysis. Preliminary results of will be shown.

Published
2018
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23. Neutron-rich nuclei produced at zero degrees in damped collisions induced by a beam of 18O on a 238U target

Author

A. Maj, C. Portail, F. Rotaru, B. Fornal, M. A. Naumenko, L. Olivier, F. de Oliveira Santos, S. Franchoo, A. Chbihi, P. Bednarczyk, A. V. Karpov, C. Petrone, Bertrand Jacquot, Oleg B. Tarasov, Ł. W. Iskra, Yu. E. Penionzhkevich, F. Azaiez, T. Lauritsen, D. Verney, M. Stanoiu, B. Szpak, F. C. L. Crespi, M. Maccormick, O. Sorlin, O. Kamalou, H. Savajols, I. Stefan, R. V. F. Janssens, I. Matea, N. Cieplicka-Oryńczak, M. Ciemala, Dieter Ackermann, Y. Blumenfeld, S. Leoni, Paola Marini, S. Calinescu, F. Hammache, M. Lewitowicz, S. M. Lukyanov, J. C. Thomas, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), 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 de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, Projectile, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, lcsh:QC1-999, Momentum, Nuclear physics, Cross section (physics), Deep-inelastic collisions, 0103 physical sciences, Neutron, Nuclear reactions, 010306 general physics, Nuclear Experiment, Beam (structure), lcsh:Physics, Exotic nuclei
Abstract

Cross sections and corresponding momentum distributions have been measured for the first time at zero degrees for the exotic nuclei obtained from a beam of 18O at 8.5 MeV/A impinging on a 1 mg/cm2 238U target. Sizable cross sections were found for the production of exotic species arising from the neutron transfer and proton removal from the projectile. Comparisons of experimental results with calculations based on deep-inelastic reaction models, taking into account the particle evaporation process, indicate that zero degree is a scattering angle at which the differential reaction cross section for production of exotic nuclei is at its maximum. This result is important in view of the new generation of zero degrees spectrometers under construction, such as the S3 separator at GANIL, for example. Keywords: Nuclear reactions, Deep-inelastic collisions, Exotic nuclei

Published
2018
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24. Multifaceted Quadruplet of Low-Lying Spin-Zero States in Ni66 : Emergence of Shape Isomerism in Light Nuclei

Author

A. Negreţ, C. Mihai, N. Florea, S. Leoni, S. Pascu, A. Mitu, Yusuke Tsunoda, L. Stroe, C. R. Niţă, S. Calinescu, I. Stiru, Ł. W. Iskra, C. Petrone, G Porzio, P. Petkov, B. Fornal, Rares Suvaila, Alin Titus Serban, N. Cieplicka-Oryǹczak, A. Olacel, Takaharu Otsuka, A. Turturica, G. Bocchi, S. Aydin, L. Stan, M. Boromiza, T. Glodariu, S. Ujeniuc, C. Sotty, A. Ionescu, Michele Sferrazza, R.E. Mihai, N. Marginean, C. A. Ur, M. Krzysiek, D. Bucurescu, F. C. L. Crespi, A. Bracco, S. Toma, C. Costache, A. Oprea, D. Ghiţă, and R. Marginean

Subjects
Physics, Light nucleus, 010308 nuclear & particles physics, SHELL model, Zero (complex analysis), General Physics and Astronomy, State (functional analysis), Prolate spheroid, 01 natural sciences, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Spin (physics), Energy (signal processing)
Abstract

A search for shape isomers in the ^{66}Ni nucleus was performed, following old suggestions of various mean-field models and recent ones, based on state-of-the-art Monte Carlo shell model (MCSM), all considering ^{66}Ni as the lightest nuclear system with shape isomerism. By employing the two-neutron transfer reaction induced by an ^{18}O beam on a ^{64}Ni target, at the sub-Coulomb barrier energy of 39 MeV, all three lowest-excited 0^{+} states in ^{66}Ni were populated and their γ decay was observed by γ-coincidence technique. The 0^{+} states lifetimes were assessed with the plunger method, yielding for the 0_{2}^{+}, 0_{3}^{+}, and 0_{4}^{+} decay to the 2_{1}^{+} state the B(E2) values of 4.3, 0.1, and 0.2 Weisskopf units (W.u.), respectively. MCSM calculations correctly predict the existence of all three excited 0^{+} states, pointing to the oblate, spherical, and prolate nature of the consecutive excitations. In addition, they account for the hindrance of the E2 decay from the prolate 0_{4}^{+} to the spherical 2_{1}^{+} state, although overestimating its value. This result makes ^{66}Ni a unique nuclear system, apart from ^{236,238}U, in which a retarded γ transition from a 0^{+} deformed state to a spherical configuration is observed, resembling a shape-isomerlike behavior.

Published
2017
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25. Challenging fission dynamics around the barrier: The case of $^{34}$S + $^{186}$W

Author

F. Hanappe, S. Calinescu, A. Gottardo, F. Azaiez, I. M. Harca, K. V. Novikov, E. M. Kozulin, I. M. Itkis, O. Dorvaux, Wladyslaw Henryk Trzaska, D. Verney, T. Loktev, Emanuele Vardaci, J. Piot, G. N. Knyazheva, C. Schmitt, I. Matea, A. A. Bogachev, C. Borcea, G. G. Chubarian, S. N. Dmitriev, C. Petrone, 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), 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 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), 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), 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 de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Vardaci, Emanuele, Harca, I. M., Schmitt, C., Itkis, I., Knyazheva, G., Novikov, K., Bogachev, A., Dmitriev, S., Loktev, T., Azaiez, F., Matea, I., Verney, D., Gottardo, A., Dorvaux, O., Piot, J., Chubarian, G., Trzaska, W. H., Hanappe, F., Borcea, C., Calinescu, S., and Petrone, C.

Subjects
Physics, Nuclear and High Energy Physics, Field (physics), 010308 nuclear & particles physics, Fission, Hadron, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Collision, Kinetic energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics
Abstract

The current status of fission dynamics studies in heavy-ion collisions around the Coulomb barrier is illustrated with the 34S + 186W reaction. The fission-fragment mass and total kinetic energy were measured at the ALTO facility at IPN Orsay, France, with a dedicated set-up using the (v, E) approach. The measurement reveals the presence of an asymmetric fission component on top of a predominantly symmetric distribution. The asymmetric structure, pointed out for the first time, is discussed along with results of previous experiments studying the same reaction. While these analyses suggested the contribution from either quasi-fission or pre-equilibrium fission, we offer an alternative interpretation, in terms of shell-driven compound-nucleus fission. The present measurement demonstrates the critical influence of resolution when addressing puzzling cases, situated at the crossroads of the various channels opened in a heavy-ion collision. Current status in the field clearly calls for innovative measurements involving manifold correlations and new observables. The outcome of the attempt done in this work in this direction, based on the coincident measurement of prompt \( \gamma\)-rays is reported, and encouraging perspectives are discussed.

Published
2016
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26. Nearly degenerate isomeric states ofCu75

Author

M. Stanoiu, L. Gaudefroy, R. Borcea, O. Sorlin, O. Kamalou, C. Plaisir, S. Calinescu, F. Rotaru, C. Petrone, C. Borcea, T. Faul, G. Gey, J. C. Thomas, G. S. Simpson, L. Caceres, R. Chevrier, J. M. Daugas, F. Negoita, and G. Georgiev

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, 0103 physical sciences, Degenerate energy levels, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

The decays of two isomeric states in the neutron-rich nucleus $^{75}\mathrm{Cu}$ have been studied via delayed $\ensuremath{\gamma}$-ray spectroscopy. These states were populated by the fragmentation of a $60.4\phantom{\rule{4pt}{0ex}}A\phantom{\rule{0.16em}{0ex}}\mathrm{MeV} ^{86}\mathrm{Kr}$ primary beam, which impinged on a Be target at the LISE2k spectrometer of GANIL. Isomeric half-lives and branching ratios were measured, and a $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence analysis performed. These have allowed a revised level scheme of $^{75}\mathrm{Cu}$ to be proposed. A comparison with large-scale shell-model calculations using different effective interactions and valence spaces shows the importance of proton excitations across the $Z=28$ shell gap for reproducing the energy spacing between the isomeric states. The coexisting collective and single-particle properties of the $(1/{2}^{\ensuremath{-}})$ and $(3/{2}^{\ensuremath{-}})$ states, respectively, are similar to those of the same states in the neighboring $^{69,71,73}\mathrm{Cu}$. The small energy spacings between the $(1/{2}^{\ensuremath{-}}), (3/{2}^{\ensuremath{-}})$, and $5/{2}^{\ensuremath{-}}$ states are responsible for the isomerism.

Published
2016
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27. Single-particle strength in neutron-richCu69from theZn70(d,He3)Cu69proton pick-up reaction

Author

C. Petrone, P. Morfouace, S. Franchoo, M. Assié, D. R. Napoli, J. Guillot, I. Stefan, F. Azaiez, L. Lefebvre, D. Suzuki, I. Matea, D. Mengoni, D. Testov, C. Borcea, N. de Séréville, B. Le Crom, L. Grassi, M. Stanoiu, R. Borcea, Fairouz Hammache, and Kamila Sieja

Subjects
Physics, Spectrometer, Proton, 010308 nuclear & particles physics, 01 natural sciences, Deuterium, 0103 physical sciences, Particle, Neutron, Born approximation, Atomic physics, 010306 general physics, Beam (structure), Energy (signal processing)
Abstract

We have performed the $^{70}\mathrm{Zn}(d,^{3}\mathrm{He})^{69}\mathrm{Cu}$ proton pick-up reaction in direct kinematics using a deuteron beam at 27 MeV. The outgoing $^{3}\mathrm{He}$ particles were detected at the focal-plane detection system of an Enge split-pole spectrometer. The excitation-energy spectrum was reconstructed up to 7 MeV and spectroscopic factors were obtained after analysis of the angular distributions in the finite-range distorted-wave Born approximation. The results show three new angular distributions for which the $\ensuremath{\pi}{f}_{7/2}$ strength was measured and a lower limit of the centroid is established. State-of-the-art shell-model calculations are performed and predict a $\ensuremath{\pi}{f}_{7/2}$ strength that lies too high in energy in comparison to our experimental results.

Published
2016
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28. Coulomb excitation ofCa44andAr46

Author

E. Wilson, P. Morfouace, István Kuti, S. Franchoo, T. Roger, Zsolt Dombrádi, J. Mrazek, Megumi Niikura, C. Petrone, W. N. Catford, Zs. Podolyák, O. Sorlin, I. Stefan, S. Calinescu, S. M. Lukyanov, R. Garcia, L. Perrot, M. Bowry, V. A. Maslov, R. A. Astabatyan, Dóra Sohler, Emyr Clement, F. Negoita, S. Grévy, Yu. Penionzhkevich, I. H. Guerin, Zs. Vajta, R. Borcea, C. Borcea, J. C. Thomas, M. Stanoiu, A. Lepailleur, R. Gillibert, F. Rotaru, and L. Caceres

Subjects
Physics, Intermediate energy, 010308 nuclear & particles physics, Drop (liquid), 0103 physical sciences, SHELL model, Coulomb excitation, Atomic physics, 010306 general physics, 01 natural sciences
Abstract

The reduced transition probabilities B(E2; 0+ g.s. → 2+ 1 ) of the 46Ar and 44Ca nuclei were studied using the Coulomb excitation technique at intermediate energy at the LISE/GANIL facility. The in-flight γ rays, emitted after the Coulomb excitation of their first 2+ states, were detected in an array of 64 BaF2 crystals. The present B(E2 ↑) value for 44Ca, 475(36) e2fm4 , agrees well with the value of 495(35) e2fm4 obtained by averaging results of previous experiments. Consistent B(E2; 0+ g.s. → 2+ 1 ) values of 225(29) e2fm4 and 234(19) e2fm4 have been obtained for 46Ar from an absolute and a relative measurement, normalized to the 44Ca value. Both results agree with the ones obtained with the same experimental technique at the NSCL facility but are a factor of 2 smaller than the shell model predictions. The drop in B(E2; 0+ g.s. → 2+ 1 ) in the Ar chain at N = 28, confirmed in this experiment, shows that 46Ar is sensitive to the N = 28 shell closure.

Published
2016
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29. Study of the neutron-rich isotope $^{46}$Ar through intermediate energy Coulomb excitation

Author

E. Wilson, J. C. Thomas, C. Borcea, J. Mrazek, O. Sorlin, Zsolt Podolyak, Y. E. Penionzhkevich, R. Garcia, R. Gillibert, Dóra Sohler, S. M. Lukyanov, L. Perrot, Zs. Vajta, Zsolt Dombrádi, István Kuti, W. N. Catford, F. Negoita, V. A. Maslov, S. Grévy, I. Stefan, P. Morfouace, R. Borcea, M. Bowry, S. Calinescu, S. Franchoo, F. Rotaru, R. A. Astabatyan, M. Stanoiu, A. Lepailleur, Emyr Clement, M. Niikura, H. Guerin, C. Petrone, L. Caceres, T. Roger, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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 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), 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), 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), 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)-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), 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), 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
Physics, 27.40.+z, 25.70.De, Isotope, 010308 nuclear & particles physics, General Physics and Astronomy, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Fragmentation (mass spectrometry), Intermediate energy, 0103 physical sciences, medicine, Neutron, Atomic physics, 010306 general physics, Nucleus
Abstract

Expérience GANIL/LISE3/CATS; International audience; The preliminary value of the reduced transition probability B(E2; 0+ ! 2+1 ) in 46Ar has been determined using the Coulomb excitation technique at intermediate energy. The 46Ar was produced in the fragmentation of a 48Ca beam at GANIL. The -rays following the Coulomb excitation of the 2+1 were emitted in-flight and detected by the 64 BaF2 detectors of the Château de Cristal array. The relatively low B(E2) value of 46Ar reported in this article supports the semi-magic character of this nucleus due to the persistence of the N = 28 shell closure at Z = 18.

Published
2013
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30. Single-particle Strength in Neutron-rich 69Cu

Author

I. Matea, B. Le Crom, C. Petrone, L. Lefebvre, C. Borcea, P. Morfouace, D. R. Napoli, I. Stefan, S. Franchoo, R. Borcea, N. de Sereville, D. Mengoni, M. Assié, A. Mutschler, F. Rotaru, L. Grassi, M. Stanoiu, F. Hammache, Jérôme Guillot, Daisuke Suzuki, F. Azaiez, Institut de Physique Nucléaire d'Orsay (IPNO), 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
Physics, 010308 nuclear & particles physics, General Physics and Astronomy, Cu-69, transferred angular momenta, Orsay tandem, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Particle, Neutron, 010306 general physics, Nuclear Experiment
Abstract

International audience; The nuclear structure of 69Cu has been investigated by means of the (d,3He) transfer reaction at the Orsay tandem in direct kinematics using a deuteron beam at Ed = 27 MeV and a target of 70Zn isotopically enriched to 95.4%. The 3He of interest from the transfer reaction were detected with the split-pole spectrometer at different angles in the laboratory frame in order to perform angular distributions and assign the angular momentum for each populated state in 69Cu. In this paper, the transferred angular momenta of the populated states will be presented.

Published
2013
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31. Unveiling the Intruder Deformed02+State inSi34

Author

A. Buta, R. Borcea, C. Petrone, L. Caceres, D. Lebhertz, S. Calinescu, O. Sorlin, J. C. Thomas, S. Grévy, Alfredo Poves, J. Mrazek, R. Chevrier, J. M. Daugas, S. M. Lukyanov, M. Stanoiu, F. Rotaru, D. Sohler, Frédéric Nowacki, Y. E. Penionzhkevich, C. Borcea, Zs. Dombrádi, and F. Negoita

Subjects
Czech, 010308 nuclear & particles physics, Romanian, Foundation (engineering), General Physics and Astronomy, State (functional analysis), 01 natural sciences, language.human_language, Political science, Double beta decay, 0103 physical sciences, language, 010306 general physics, Humanities
Abstract

This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support

Published
2012
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32. Gamma Spectroscopy of Low-energy Isomeric States in Neutron-rich Nuclei: 75Cu

Author

Georgi P. Georgiev, G. S. Simpson, F. Negoita, C. Petrone, R. Borcea, L. Gaudefroy, O. Sorlin, L. Caceres, R. Chevrier, C. Plaisir, O. Kamalou, Guillaume Gey, J. M. Daugas, S. Calinescu, M. Stanoiu, C. Borcea, F. Rotaru, and J. C. Thomas

Subjects
Nuclear physics, Physics, Low energy, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, Gamma spectroscopy, Neutron, 010306 general physics, 01 natural sciences
Published
2013
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