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1. Selective activation of failure mechanisms in packaged double-heterostructure light emitting diodes using controlled neutron energy irradiation.

Author: Yannick Deshayes, Isabelle Bord-Majek, G. Barreau, M. Aiche, Philippe Moretto, Laurent Béchou, A. C. Roehrig, and Yves Ousten
Published: 2008
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2. Experimental set-up for the simultaneous measurement of fission and γ-emission probabilities induced by transfer or inelastic-scattering reactions

Author: B. Jurado, V. Méot, O. Roig, Q. Ducasse, I. Tsekhanovich, M. Aiche, S. Czajkowski, Paola Marini, L. Mathieu, A. Henriques, R. Pérez Sánchez, and D. Denis-Petit
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Projectile, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Inelastic scattering, 01 natural sciences, Measure (mathematics), Nuclear physics, Set (abstract data type), 0103 physical sciences, Nuclear Experiment, 010306 general physics, Instrumentation, Excitation
Abstract: Fission and γ -emission probabilities induced by transfer or inelastic scattering reactions with light projectile nuclei are very valuable quantities for constraining the models that describe the de-excitation of heavy nuclei . We have developed an experimental set-up that allows us to simultaneously measure fission and γ -emission probabilities. The measurement of the γ -emission probability at excitation energies where the fission channel is open is challenging due to the intense background of γ rays emitted by the fission fragments. We discuss the procedure to subtract such a background and the constraints that this subtraction and other experimental conditions put on the set up. We show that our set-up complies with these constraints.
Published: 2019
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3. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author: D. Macina, A. Musumarra, K. Göbel, M. Sabaté-Gilarte, E. Mendoza, A. Oprea, I. Knapova, N. V. Sosnin, T. Wright, J. Heyse, Rene Reifarth, N. Kivel, R. Nolte, L. Cosentino, J. Marganiec, P. F. Mastinu, P. Vaz, F. Bečvář, Annamaria Mazzone, Petar Žugec, M. Aiche, I. Duran, Stefan Kopecky, A. Saxena, A. Kimura, Alberto Ventura, G. Vannini, S. Valenta, Nicola Colonna, M. Kokkoris, M. A. Cortés-Giraldo, P. M. Milazzo, R. Dressler, P. Kavrigin, E. Dupont, Carlos Guerrero, G. Sibbens, M. Mastromarco, Marco Calviani, B. Laurent, E. González-Romero, P. Ferreira, Mario Barbagallo, L. Audouin, M. Krtička, A. Pavlik, A. G. Smith, J. Billowes, D. Schumann, E. Griesmayer, Anton Wallner, Alexandru Negret, G. Cortes, C. Domingo-Pardo, G. Tagliente, M. Bacak, L. A. Damone, F. Käppeler, J. Balibrea, Philip Woods, O. Aberle, D. Vanleeuw, F. Mingrone, J. Andrzejewski, F. Calviño, H. Leeb, E. A. Maugeri, A. Kalamara, T. Martinez, C. Weiss, R. Vlastou, Olivier Serot, Carlo Rubbia, V. Vlachoudis, J. Perkowski, M. Diakaki, D. Radeck, Alfredo Ferrari, E. Berthoumieux, Stephan Richter, P. Schillebeeckx, S. Warren, F. Gunsing, A. Masi, Damir Bosnar, Y. Kadi, A. Manna, Hideo Harada, Deniz Kurtulgil, V. Variale, D. G. Jenkins, Y. H. Chen, Cristian Massimi, P. V. Sedyshev, G. Belier, S. Heinitz, V. Furman, A. Stamatopoulos, E. Chiaveri, D. Cano-Ott, A. S. Brown, A. Casanovas, C. Lederer, E. Jericha, T. Glodariu, Paolo Finocchiaro, J. M. Quesada, L. Tassan-Got, A. Moens, J. A. Ryan, S. Amaducci, Simone Gilardoni, R. Cardella, Javier Praena, S. Lo Meo, M. Caamaño, F. Cerutti, B. Fernández-Domínguez, J. L. Tain, J. Taieb, L. Mathieu, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, A. R. García, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, J. Lerendegui-Marco, I. F. Gonçalves, N. Patronis, Alberto Mengoni, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Bacak, M., Aiche, M., Belier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Gunsing, F., Heyse, J., Kopecky, S., Laurent, B., Leeb, H., Mathieu, L., Moens, A., Richter, S., Schillebeeckx, P., Serot, O., Sibbens, G., Taieb, J., Vanleeuw, D., Vlachoudis, V., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Balibrea, J., Barbagallo, M., Becvar, F., Billowes, J., Bosnar, D., Brown, A., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Domingo-Pardo, C., Dressler, R., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Gobel, K., Garcia, A. R., Gawlik, A., Gilardoni, S., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Griesmayer, E., Guerrero, C., Harada, H., Heinitz, S., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J., Macina, D., Manna, A., Marganiec, J., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rauscher, T., Reifarth, R., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schumann, D., Sedyshev, P., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J., Wright, T., Zugec, P., Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak M., Aiche M., Belier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Moens A., Richter S., Schillebeeckx P., Serot O., Sibbens G., Taieb J., Vanleeuw D., Vlachoudis V., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Becvar F., Billowes J., Bosnar D., Brown A., Caamano M., Calvino F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y.H., Chiaveri E., Colonna N., Cortes G., Cortes-Giraldo M.A., Cosentino L., Damone L.A., Domingo-Pardo C., Dressler R., Duran I., Fernandez-Dominguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Gobel K., Garcia A.R., Gawlik A., Gilardoni S., Glodariu T., Goncalves I.F., Gonzalez-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D.G., Jericha E., Kappeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krticka M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.J., Macina D., Manna A., Marganiec J., Martinez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J.M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J.A., Sabate-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A.G., Sosnin N.V., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeno-Saldivia A., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P.J., Wright T., and Zugec P.
Subjects: Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Nuclear Theory, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Context (language use), Neutrons--Captura, 01 natural sciences, 7. Clean energy, Neutrons--Capture, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 233 U, ddc:530, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, [PHYS]Physics [physics], Fission detector, 233U, Time-of-flight, Física [Àrees temàtiques de la UPC], Fissile material, 010308 nuclear & particles physics, Detector, Neutron radiation, Fast fission, NATURAL SCIENCES. Physics, Calorimeter, PRIRODNE ZNANOSTI. Fizika, Neutron capture, 13. Climate action, Física nuclear, Other
Abstract: In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ��) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed., This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT.
Published: 2020
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4. Simultaneous determination of neutron-induced fission and radiative-capture cross sections from decay probabilities obtained with a surrogate reaction

Author: A. Henriques, M. Aiche, Fabio Zeiser, Andreas Görgen, R. Pérez Sánchez, O. Bouland, Katsuhisa Nishio, L. Audouin, Paola Marini, S. Delpech, V. Méot, B. Jurado, O. Roig, Magne Guttormsen, D. Ramos, M. Dupuis, I. Tsekhanovich, S. Czajkowski, Grégoire Kessedjian, Sunniva Siem, L. Mathieu, D. Denis-Petit, C. Cannes, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA Cadarache, 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 Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), 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, Work (thermodynamics), Fission, Astrophysics::High Energy Astrophysical Phenomena, Single measurement, Radiative capture, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Measure (mathematics), Nuclear physics, 0103 physical sciences, Nuclear astrophysics, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Parity (mathematics), Nuclear Experiment, Nuclear Physics
Abstract: Reliable neutron-induced reaction cross sections of unstable nuclei are essential for nuclear astrophysics and applications but their direct measurement is often impossible. The surrogate-reaction method is one of the most promising alternatives to access these cross sections. In this work, we successfully applied the surrogate-reaction method to infer for the first time both the neutron-induced fission and radiative-capture cross sections of 239Pu in a consistent manner from a single measurement. This was achieved by combining simultaneously-measured fission and gamma-emission probabilities for the 240Pu(4He,4He') surrogate reaction with a calculation of the angular-momentum and parity distributions populated in this reaction. While other experiments measure the probabilities for some selected gamma-ray transitions, we measure the gamma-emission probability. This enlarges the applicability of the surrogate-reaction method., Comment: 8 pages, 3 figures
Published: 2020
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5. Simulations of a parallel plate Fission Chamber using the MCNPX simulation code

Author: M. Aiche, L. Mathieu, 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), and Mathieu, Ludovic
Subjects: Physics, [PHYS]Physics [physics], Nuclear and High Energy Physics, MCNPX simulations, 010308 nuclear & particles physics, Fission, Fission chamber, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear engineering, Process (computing), Parallel plate fission chamber, Alpha-FF discrimination, 01 natural sciences, Parallel plate, ComputingMethodologies_PATTERNRECOGNITION, 0103 physical sciences, Code (cryptography), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Instrumentation
Abstract: International audience; MCNPX in its latest version is able to simulate the transportation of Fission Fragments. It opens the door to Fission Chamber simulations. Such simulations are not straightforward and comparisons with experimental spectra often failed. A procedure is described in the present paper to perform such simulation and to process the result to obtain realistic spectra. Simulated spectra are compared with experimental ones in various conditions to validate the method and to present its limitations.
Published: 2020
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6. Effects of the nuclear structure of fission fragments on the high-energy prompt fission γ -ray spectrum in U235(nth,f)

Author: Andrew Pollitt, Song Guo, Tsutomu Ohtsuki, Katsuhisa Nishio, T. Soldner, R. Leguillon, S. Czajkowski, A. Astier, R. Orlandi, L. Mathieu, Kentaro Hirose, Hiroyuki Makii, R. J. W. Frost, M. Aiche, C. M. Petrache, I. Tsekhanovich, F.-J. Hambsch, Ulli Köster, Toshihiko Kawano, T. Ogawa, Shun Sekimoto, and Koichi Takamiya
Subjects: Physics, Nuclear reaction, Range (particle radiation), 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Spectrum (functional analysis), Nuclear structure, 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, Nuclide, Nuclear Experiment, 010306 general physics, Excitation
Abstract: The prompt fission γ-ray energy spectrum for cold-neutron-induced fission of U235 was measured in the energy range Eγ=0.8–20MeV, by gaining a factor of about 105 in statistics compared to the measurements performed so far. The spectrum exhibits local bump structures at Eγ≈4MeV and ≈6MeV, and also a broad one at ≈15MeV. In order to understand the origins of these bumps, the γ-ray spectra were calculated using a statistical Hauser-Feshbach model, taking into account the deexcitation of all the possible primary fission fragments. It is shown that the bump at ≈4MeV is created by the transitions between the discrete levels in the fragments around Sn132, and the bump at ≈6MeV mostly comes from the complementary light fragments. It is also indicated that a limited number of nuclides, which have high-spin states at low excitation energies, can contribute to the bump structure around Eγ≈15MeV, induced by the transition feeding into the low-lying high-spin states.
Published: 2019
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7. Development of a gaseous proton-recoil telescope for neutron flux measurements between 0.2 and 2 MeV neutron energy

Author: Paola Marini, L. Mathieu, S. Czajkowski, I. Tsekhanovich, B. Jurado, M. Aiche, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)
Subjects: Physics - Instrumentation and Detectors, Proton, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Neutron detector, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 030218 nuclear medicine & medical imaging, law.invention, Nuclear physics, Telescope, 03 medical and health sciences, Cross section (physics), 0302 clinical medicine, Neutron flux, law, 0103 physical sciences, Neutron detection, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, 010302 applied physics, Physics, Elastic scattering, Radiation, Instrumentation and Detectors (physics.ins-det), Neutron radiation, Neutron temperature, Physics::Accelerator Physics, Proton-recoil detector
Abstract: Absolute measurements of neutron fluence are an essential prerequisite of neutron-induced cross section measurements, neutron beam lines characterization and dosimetric investigations. The H(n,p) elastic scattering cross section is a very well known standard used to perform precise neutron flux measurements in high precision measurements. The use of this technique, with proton recoil detectors, is not straightforward below incident neutron energy of 1 MeV, due to a high background in the detected proton spectrum. Experiments have been carried out at the AIFIRA facility to investigate such background and to determine its origin and components. Based on these investigations, a gaseous proton-recoil detector has been designed with a reduced low energy background. A first test of this detector has been carried out at the AIFIRA facility, and first results will be presented., Comment: Submitted
Published: 2019
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8. Preliminary results on the $^{233}U$ capture cross section and alpha ratio measured at n_TOF (CERN) with the fission tagging technique

Author: A. S. Brown, M. Krtička, F. Calviño, H. Leeb, J. Perkowski, T. Martinez, Rene Reifarth, J. M. Quesada, L. Tassan-Got, Pedro G. Ferreira, M. Sabaté-Gilarte, P. M. Milazzo, F. Gunsing, J. Marganiec, A. Pavlik, C. Domingo-Pardo, Cristian Massimi, L. Audouin, M. Bacak, L. Cosentino, B. Laurent, D. Cano-Ott, M. Diakaki, A. Musumarra, C. Rubbia, A. Kimura, T. Glodariu, E. Chiaveri, O. Serot, Stefan Kopecky, P. F. Mastinu, F. Cerutti, S. Warren, A. Oprea, E. Jericha, I. Knapova, Paolo Finocchiaro, G. Bélier, P. Vaz, R. Vlastou, D. Radeck, Dorothea Schumann, S. Heinitz, Mario Barbagallo, Rugard Dressler, J. A. Ryan, E. Berthoumieux, V. Variale, M. Mastromarco, A. Kalamara, Alberto Ventura, D. Macina, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Mingrone, Carlos Guerrero, C. Lederer, M. A. Cortés-Giraldo, Anton Wallner, L. Mathieu, Ignacio Porras, Simone Gilardoni, Nicola Colonna, D. Bosnar, J. Balibrea, J. Taieb, E. Dupont, Vasilis Vlachoudis, A. Manna, F. Bečvář, Emilio Andrea Maugeri, G. Tagliente, J. Lerendegui-Marco, E. Mendoza, R. Cardella, V. Furman, I. F. Gonçalves, T. J. Wright, C. Weiss, M. Kokkoris, Peter Schillebeeckx, N. V. Sosnin, Annamaria Mazzone, O. Aberle, A. Casanovas, Kathrin Göbel, Petar Žugec, S. Valenta, Y. H. Chen, Hideo Harada, J. L. Tain, A. Masi, Jan Heyse, Javier Praena, S. Lo Meo, D. G. Jenkins, Niko Kivel, Deniz Kurtulgil, N. Patronis, P. V. Sedyshev, A. K. Saxena, Arnaud Ferrari, A. Stamatopoulos, J. Billowes, Marco Calviani, A. G. Smith, Alexandru Negret, B. Fernández-Domínguez, F. Käppeler, Philip Woods, E. Leal-Cidoncha, Y. Kadi, A. Gawlik, Thomas Rauscher, G. Vannini, M. Caamaño, J. Andrzejewski, G. Cortes, E. González-Romero, A. Mengoni, M. Aiche, I. Duran, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, A. R. García, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Saclay, Université de Bordeaux (UB), CEA Cadarache, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Serot, O., and Chebboubi, A.
Subjects: Nuclear reaction, Fission, Physics::Instrumentation and Detectors, QC1-999, Nuclear physics, 01 natural sciences, 7. Clean energy, 0103 physical sciences, CERN, Neutron, n_TOF, 010306 general physics, Nuclear Experiment, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, [PHYS]Physics [physics], Large Hadron Collider, Fissile material, Física [Àrees temàtiques de la UPC], Cross section, 010308 nuclear & particles physics, Calorimeter, Neutron capture, n_TOF, 233U, neutron capture, alpha ratio, fission tagging, Ionization chamber, Física nuclear, Other
Abstract: 233U is of key importance among the fissile nuclei in the Th-U fuel cycle. A particularity of 233U is its small neutron capture cross-section, which is on average about one order of magnitude lower than the fission cross-section. The accuracy in the measurement of the 233U capture cross-section depends crucially on an efficient capture-fission discrimination, thus a combined set-up of fission and γ-detectors is needed. A measurement of the 233U capture cross-section and capture-to-fission ratio was performed at the CERN n_TOF facility. The Total Absorption Calorimeter (TAC) of n_TOF was employed as γ-detector coupled with a novel compact ionization chamber as fission detector. A brief description of the experimental set-up will be given, and essential parts of the analysis procedure as well as the preliminary response of the set-up to capture are presented and discussed.
Published: 2018
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9. A new detector system for the measurement of high-energy prompt γ -rays for low-energy neutron induced fission

Author: Andrew Pollitt, Song Guo, F.-J. Hambsch, R. J. W. Frost, Tsutomu Ohtsuki, R. Leguillon, A. Astier, Torsten Soldner, S. Czajkowski, R. Orlandi, L. Mathieu, Hiroyuki Makii, Kentaro Hirose, I. Tsekhanovich, C. M. Petrache, Katsuhisa Nishio, M. Aiche, Shun Sekimoto, Koichi Takamiya, Ulli Köster, Tatsuhiko Ogawa, Institut Laue-Langevin (ILL), ILL, 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Detector, Nuclear Theory, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Neutron temperature, Spectral line, Nuclear physics, Dipole, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract: We have developed a new setup to measure prompt fission γ -ray spectra in neutron induced fission up to energies sufficient to reveal the structure associated with giant dipole resonances of fission fragments. The setup consists of multi-wire proportional counters , to detect both fission fragments in coincidence, and two large volume (101.6 mm in diameter and 127.0 mm in length) LaBr 3 (Ce) scintillators , to measure the γ rays. The setup was used to obtain the prompt fission γ -ray spectrum for thermal neutron induced fission of 235 U at the PF1B cold-neutron beam facility of the Institut Laue-Langevin, Grenoble, France. We have successfully measured the γ -ray spectrum up to energies of about 20 MeV, what extends the currently known γ -ray spectrum limit to higher energies by approximately a factor of two.
Published: 2018
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10. Pu242 neutron-induced fission cross-section measurement from 1 to 2 MeV neutron energy

Author: B. Jurado, L. Mathieu, S. Czajkowski, J. Matarranz, A. J. M. Plompen, Grégoire Kessedjian, Paola Marini, P. Salvador-Castiñeira, J. Taieb, Q. Ducasse, G. Belier, M. Aiche, and I. Tsekhanovich
Subjects: Physics, 010308 nuclear & particles physics, Neutron emission, Isotopes of samarium, Fission product yield, 01 natural sciences, Fast fission, Neutron temperature, Nuclear physics, Prompt neutron, 0103 physical sciences, Neutron cross section, Neutron, Nuclear Experiment, 010306 general physics
Abstract: Relative values of the neutron-induced fission cross section $\ensuremath{\sigma}(n,f)$ of $^{242}\mathrm{Pu}$ have been measured with respect to the standard $^{1}\mathrm{H}(n,p)$ elastic scattering cross section, at average energies of 1.0, 1.4, and $1.9\phantom{\rule{4pt}{0ex}}\mathrm{MeV}$. The measurements are part of an international effort to reduce uncertainties and provide independent nuclear data relevant for fast-spectrum reactors. The shape of the measured cross section is in good agreement with data from Tovesson et al. [Phys. Rev. C 79, 014613 (2009)] and with the most recent data from Matei et al. [Phys. Rev. C 95, 024606 (2017)], but disagrees with the shapes of ENDF/B-VII.1 and JEFF3.2 evaluations. Absolute values of $\ensuremath{\sigma}(n,f)$, obtained under some assumptions, indicate an overestimation of $\ensuremath{\sigma}(n,f)$ in the evaluated libraries at 1.0 and $1.4\phantom{\rule{4pt}{0ex}}\mathrm{MeV}$, while a good agreement is found with ENDF/B-VII.1 at $1.9\phantom{\rule{4pt}{0ex}}\mathrm{MeV}$. A careful analysis of the impact of scattered neutrons and anisotropy of the fission fragment angular distribution has been performed. The measurement of the neutron flux by means of a proton-recoil detector is discussed. A comprehensive study of corrections applied to the data, of associated uncertainties, and of correlations between the measurements at the different energies is presented.
Published: 2017
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11. Ksar Taghit: Earthen architecture between authenticity and changes

Author: T. Bachir Cherif and M. Aiche
Published: 2017
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12. Preliminary results on the 233U α-ratio measurement at n_TOF

Author: O. Serot, Stefan Kopecky, Y. H. Chen, Rene Reifarth, J. M. Quesada, L. Tassan-Got, Calviani, B. Laurent, J. Lerendegui-Marco, M. A. Cortés-Giraldo, A. Kimura, Alexandru Negret, L. Mathieu, Y. Kadi, P. J. Woods, B. Fernández-Domínguez, F. Käppeler, L. Cosentino, Hideo Harada, A. Musumarra, G. Vannini, I. Knapova, M. Mastromarco, N. Patronis, E. Jericha, A. K. Saxena, A. Oprea, Pedro G. Ferreira, Mario Barbagallo, Arnaud Ferrari, Anton Wallner, Paolo Finocchiaro, M. Krtička, F. Mingrone, Dorothea Schumann, J. Balibrea, T. Martinez, I. F. Gonçalves, J. A. Ryan, J. Billowes, S. Valenta, C. Lederer, V. Furman, T. J. Wright, A. Masi, P. Vaz, D. G. Jenkins, A. G. Smith, F. Gunsing, J. Marganiec, Colonna, Emilio Andrea Maugeri, A. S. Brown, A. Manna, N. V. Sosnin, M. Kokkoris, M. Caamaño, Cristian Massimi, Kathrin Göbel, Annamaria Mazzone, Petar Žugec, Rugard Dressler, Alberto Ventura, G. Tagliente, E. Chiaveri, D. Cano-Ott, P. F. Mastinu, J. Andrzejewski, M. Diakaki, P. M. Milazzo, Jan Heyse, F. Calviño, H. Leeb, O. Aberle, D. Bosnar, J. Perkowski, V. Vlachoudis, A. Casanovas, C. Rubbia, C. Weiss, L. Audouin, Ignacio Porras, M. Bacak, R. Vlastou, G. Cortes, D. Radeck, E. Berthoumieux, F. Bečvář, A. Kalamara, S. Heinitz, J. L. Tain, E. Mendoza, A. Pavlik, Niko Kivel, C. Domingo-Pardo, Peter Schillebeeckx, S. Warren, V. Variale, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Cerutti, Simone Gilardoni, R. Cardella, E. Leal-Cidoncha, Javier Praena, S. Lo Meo, P. Kavrigin, A. Gawlik, Thomas Rauscher, Ralf Nolte, E. Griesmayer, L. A. Damone, E. González-Romero, A. Mengoni, M. Aiche, I. Duran, A. R. García, T. Glodariu, D. Macina, Carlos Guerrero, J. Taieb, Deniz Kurtulgil, P. V. Sedyshev, A. Stamatopoulos, G. Bélier, E. Dupont, M. Sabaté-Gilarte, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA Cadarache, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), n_TOF, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ge, Z., Shu, N., Chen, Y., Wang, W., and Zhang, H.
Subjects: Physics, Coupling, Fissile material, 010308 nuclear & particles physics, Fission, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Calorimeter, Neutron capture, Cross section (physics), 0103 physical sciences, Nuclear Physics - Experiment, Nuclear Experiment, 010306 general physics, Absorption (electromagnetic radiation), n_TOF, 233U, alpha-ratio, neutron time of flight, Order of magnitude
Abstract: This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT. The authors would like to acknowledge more specifically JRC Geel for targets preparation and for providing full support for a first test measurement of the fission chamber at GELINA., U-233 is the fissile nuclei in the Th-U fuel cycle with a particularily small neutron capture cross setion which is on average about one order of magnitude lower than its fission cross section. Hence, the measurement of the U-233(n,gamma) cross section relies on a method to accurately distinguish between capture and fission gamma-rays. A measurement of the U-233 alpha-ratio has been performed at the n_TOF facility at CERN using a so-called fission tagging setup, coupling nTOF 's Total Absorption Calorimeter with a novel fission chamber to tag the fission gamma-rays. The experimental setup is described and essential parts of the analysis are discussed. Finally, a preliminary U-233 alpha-ratio is presented., French NEEDS/NACRE Project, European Commission within HORIZON2020 via the EURATOM Project EUFRAT
Published: 2020
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13. A compact multi-plate fission chamber for the simultaneous measurement of 233U capture and fission cross-sections

Author: F. Gunsing, M. Diakaki, H. Leeb, E. Berthoumieux, E. Dupont, M. Aiche, Stefan Kopecky, Peter Schillebeeckx, Jan Heyse, M. Bacak, Vlachoudis, A. Chatillon, R. Cardella, L. Mathieu, B. Laurent, G. Belier, J. Taieb, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), n_TOF, 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: Nuclear reaction, Physics, Fissile material, 010308 nuclear & particles physics, Fission, Physics::Instrumentation and Detectors, Nuclear engineering, QC1-999, MicroMegas detector, 01 natural sciences, 7. Clean energy, Neutron capture, Uranium-233, 0103 physical sciences, Neutron detection, Neutron, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment
Abstract: International audience; 233U plays the essential role of fissile nucleus in the Th-U fuel cycle. A particularity of 233U is its small neutron capture cross-section which is about one order of magnitude lower than the fission cross-section on average. Therefore, the accuracy in the measurement of the 233U capture cross-section essentially relies on efficient capture-fission discrimination thus a combined setup of fission and γ-detectors is needed. At CERN n_TOF the Total Absorption Calorimeter (TAC) coupled with compact fission detectors is used. Previously used MicroMegas (MGAS) detectors showed significant γ-background issues above 100 eV coming from the copper mesh. A new measurement campaign of the 233U capture cross-section and alpha ratio is planned at the CERN n_TOF facility. For this measurement, a novel cylindrical multi ionization cell chamber was developed in order to provide a compact solution for 14 active targets read out by 8 anodes. Due to the high specific activity of 233U fast timing properties are required and achieved with the use of customized electronics and the very fast ionizing gas CF4 together with a high electric field strength. This paper describes the new fission chamber and the results of the first tests with neutrons at GELINA proving that it is suitable for the 233U measurement.
Published: 2017
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14. D+D fusion reactions in 1018 W/cm2 intensity and repetitive laser-plasma interactions

Author: G. Boutoux, A. Nguyen, Claudio Verona, F. Ingenito, R. De Angelis, M. Cipriani, M. Aiche, Didier Mazon, G. Andrianaki, Katarzyna Jakubowska, Dimitri Batani, A. Solheilhac, J. E. Ducret, Gianluca Verona-Rinati, A. Jardin, L. Mathieu, Frédéric Burgy, C. Pejot, Danilo Giulietti, Fabrizio Consoli, and S. Hulin
Subjects: Materials science, General Physics and Astronomy, Pulse duration, Plasma, Scintillator, Laser, 01 natural sciences, 010305 fluids & plasmas, law.invention, Full width at half maximum, law, 0103 physical sciences, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Eclipse
Abstract: We studied D + D fusion reactions at the CELIA/ECLIPSE laser facility. These reactions were triggered by focusing the ECLIPSE laser (up to 100 mJ on target, pulse duration of 40 fs and focal spot of FWHM) on a solid C2 D4 target. By detecting the 2.5 MeV neutrons, produced in the D + D fusion reaction, using C6 D6 scintillators in a time-of-flight experimental set-up, we measured a rate of a few hundred fusions per shot. At the same time, we detected also energetic ions (up to a few 100 keV) using time-of-flight diamond detectors. The experimental set-up will be presented and the results discussed and compared with dedicated simulations.
Published: 2017

15. Accurate measurement of a fission chamber efficiency using the prompt fission neutron method

Author: Paola Marini, L. Mathieu, M. Aiche, B. Jurado, I. Tsekhanovich, S. Czajkowski, Grégoire Kessedjian, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, 010308 nuclear & particles physics, Fission, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Measure (physics), Flux, Cosmic ray, Neutron radiation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Scientific method, 0103 physical sciences, Neutron detection, Neutron, 010306 general physics, Nuclear Experiment
Abstract: International audience; Fission Chambers (FC) are often used to determine fission cross sections and to measure the neutron beam flux via standard neutron-induced fission reactions. Thus, the fission detection efficiency is a key parameter. Several methods exist to determine this efficiency, with a final accuracy not better than 1%. The detection of prompt fission neutrons allows events related to the fission process to be tagged, and enables the efficiency to be inferred with accuracy of the order of few 0.1%. This method is very robust since it is independent in first order to several factors like geometry, used materials or neutron contour selection. To obtain high accuracy, few corrections have still to be taken into account. In particular, the neutron detectors have to cover several detection angles. In addition, the background contribution of neutrons from cosmic rays or from an accelerator has to be removed. Several experiments based on the use of a 252Cf source are presented to describe all these points.
Published: 2016
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16. Investigation of theU238(d,p)surrogate reaction via the simultaneous measurement ofγ-decay and fission probabilities

Author: B. Jurado, S. J. Rose, O. Roig, F. Gunsing, Trine Wiborg Hagen, Q. Ducasse, Magne Guttormsen, G. Barreau, A. C. Larsen, Olivier Serot, G. Boutoux, Sunniva Siem, J. N. Wilson, S. Czajkowski, Jin Lei, M. Aiche, Gry Merete Tveten, Therese Renstrøm, I. Tsekhanovich, Tamas Gabor Tornyi, L. Mathieu, F. Giacoppo, M. Wiedeking, M. Lebois, Andreas Görgen, Paola Marini, A. M. Moro, V. Méot, and B. Morillon
Subjects: Physics, Angular momentum, 010308 nuclear & particles physics, Fission, Nuclear Theory, Statistical model, Breakup, 01 natural sciences, 7. Clean energy, Nuclear physics, Deuterium, 0103 physical sciences, Atomic physics, Born approximation, Nuclear Experiment, 010306 general physics, Uncertainty analysis
Abstract: We investigated the U238(d,p) reaction as a surrogate for the n+U238 reaction. For this purpose we measured for the first time the γ-decay and fission probabilities of U∗239 simultaneously and compared them to the corresponding neutron-induced data. We present the details of the procedure to infer the decay probabilities, as well as a thorough uncertainty analysis, including parameter correlations. Calculations based on the continuum-discretized coupled-channels method and the distorted-wave Born approximation (DWBA) were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where fission and γ emission compete, the corrected fission probability is in agreement with neutron-induced data, whereas the γ-decay probability is much higher than the neutron-induced data. We have performed calculations of the decay probabilities with the statistical model and of the average angular momentum populated in the U238(d,p) reaction with the DWBA to interpret these results.
Published: 2016
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17. Experimental Approaches to Studying the Fission Process Using the Surrogate Reaction Technique

Author: L. A. Bernstein, I. Companis, S. Czajkowski, V. Méot, Jason Burke, L. W. Phair, M. Aiche, L. Mathieu, Jutta Escher, I J Thompson, J. M. Gostic, D. Bluel, Roger Henderson, T. J. Ross, C. W. Beausang, J. Munson, G. Barreau, Bethany L. Goldblum, B. Hass, O. Roig, N. D. Scielzo, C. T. Angell, Jennifer J. Ressler, N. Cappelan, Beatriz Jurado, M. Weideking, R. Hughes, Robert Hatarik, Lawrence Livermore National Laboratory (LLNL), Département de Physique Nucléaire (ex SPhN) (DPHN), 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)-Université Paris-Saclay, Aval du cycle et Energie Nucléaire (ACEN), 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), and 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)
Subjects: Physics, Fission, Surrogate reaction, Cross section, 010308 nuclear & particles physics, Nuclear Theory, Nuclear data, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 238Pu, 0103 physical sciences, ND2010, Nuclear science, Nuclear Experiment, 010306 general physics, National laboratory, Humanities
Abstract: J. T. Burke, ∗ J. J. Ressler, J. E. Escher, N. D. Scielzo, I. J. Thompson, R. Henderson, J. Gostic, L. Bernstein, D. Bluel, M. Weideking, V. Meot, O. Roig, L. W. Phair, R. Hatarik, J. Munson, 4 C. Angell, B. Goldblum, C. W. Beausang, T. Ross, R. Hughes, M. Aiche, G. Barreau, N. Cappelan, S. Czajkowski, B. Hass, B. Jurado, L. Mathieu and I. Companis 8 Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Service de Physique Nucleaire, Commissariat a l’Energie Atomique, Bruyeres-le-Chatel, Arpajon, France Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA Nuclear Physics Department, University of Richmond, Richmond, Virginia 23173, USA Centre d’Etudes Nucleaires Bordeaux Gradignan, CNRS/IN2P3, Univ. Bordeaux 1, Chemin du Solarium, 33175 GRADIGNAN, France Centre d’Etudes Nuclaires Bordeaux Gradignan, CNRS/IN2P3, Univ. Bordeaux 1, Chemin du Solarium, 33175 GRADIGNAN, France Horia Hulubei National Institute for Physics and Nuclear Engineering, 077125 Bucharest-Magurele, Romania
Published: 2011
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18. Neutron-Induced Capture Cross Sections via the Surrogate Reaction Method

Author: M. Aiche, F. Gunsing, V. Méot, Jason Burke, N. Capellan, S. Czajkowski, I. Matea, L. Tassan-Got, I. Companis, L. Gaudefroy, C. Theroine, J. Taieb, J. M. Daugas, O. Roig, X. Derkx, L. Mathieu, G. Boutoux, B. Haas, E. Bauge, M. G. Porquet, N. Pillet, Olivier Serot, G. Barreau, P. Romain, A. Bail, T. Faul, Beatriz Jurado, D. Dassi, P. Morel, Aval du cycle et Energie Nucléaire (ACEN), 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 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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 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 physics, Materials science, General Physics and Astronomy, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy
Abstract: Measurement at the Tandem accelerator of the IPN Orsay; The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. This technique enablesneutron-induced cross sections to be extracted for nuclear reactions on short-lived unstable nuclei that otherwise can not be measured. This technique has been succesfully applied to determine the neutron-induced fission cross sections of several short-lived nuclei. In this work we investigate whether this powerful technique can also be used to determine of neutron-induced capture cross sections. For this purpose we use the surrogate reaction 174Yb(3He,pγ)176Lu to infer the well known 175Lu(n,γ) cross section and compare the results with the directly measured neutron-induced data. This surrogate experiment has been performed in March 2010. The experimental technique used and the first preliminary results will be presented.
Published: 2011
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19. Application of the EXtrapolated Efficiency Method (EXEM) to infer the gamma-cascade detection efficiency in the actinide region

Author: L. Mathieu, M. Aiche, Q. Ducasse, B. Jurado, Paola Marini, B. Morillon, I. Tsekhanovich, 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), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Direction des Applications Militaires (DAM)
Subjects: Nuclear and High Energy Physics, Work (thermodynamics), Physics - Instrumentation and Detectors, Fission, Gamma-cascade detection efficiency, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Measure (mathematics), 0103 physical sciences, Neutron, Statistical physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Extrapolated-Efficiency Method, 010308 nuclear & particles physics, Actinide, Instrumentation and Detectors (physics.ins-det), Cascade, Surrogate-reaction method, Transfer-induced decay probabilities
Abstract: International audience; The study of transfer-induced gamma-decay probabilities is very useful for understanding the surrogate-reaction method and, more generally, for constraining statistical-model calculations. One of the main difficulties in the measurement of gamma-decay probabilities is the determination of the gamma-cascade detection efficiency. In Boutoux et al. (2013) [10] we developed the EXtrapolated Efficiency Method (EXEM), a new method to measure this quantity. In this work, we have applied, for the first time, the EXEM to infer the gamma-cascade detection efficiency in the actinide region. In particular, we have considered the 238 U(d,p) 239 U and 238 U( 3 He,d) 239 Np reactions. We have performed Hauser–Feshbach calculations to interpret our results and to verify the hypothesis on which the EXEM is based. The determination of fission and gamma-decay probabilities of 239 Np below the neutron separation energy allowed us to validate the EXEM.
Published: 2016
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20. Improvements in the in-beam γ-ray spectroscopy provided by an ancillary detector coupled to a Ge γ-spectrometer: the DIAMANT-EUROGAM II example

Author: D. Curien, A. Brondi, J. N. Scheurer, M. Harston, T.P. Doan, M. M. Aléonard, J.F. Chemin, D. Boivin, R. Moro, F. Bourgine, D. Cabaussel, M. Aiche, Emanuele Vardaci, G. La Rana, J.P. Goudour, G. Barreau, J. N., Scheurer, M., Aiche, M. M., Aleonard, G., Barreau, F., Bourgine, D., Boivin, D., Cabaussel, J. F., Chemin, T. P., Doan, J. P., Goudour, M., Harston, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Vardaci, Emanuele, and D., Curien
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, business.industry, Detector, scintillation detector, Scintillator, Doppler shift correction, gamma ray spectroscopy, Charged particle, Nuclear physics, symbols.namesake, Optics, symbols, Gamma spectroscopy, Spectroscopy, business, charged particle spectrometer, Instrumentation, Doppler effect, Beam (structure)
Abstract: For the first time the 4π γ-ray spectrometer EUROGAM II has been coupled to a 4π light charged particle detector array, DIAMANT, during a test experiment on the reaction 32 S + 58 Ni at 120 MeV beam energy. A very large improvement in the peak-to-background ratio of the γ-spectra has been found when EUROGAM II is triggered by DIAMANT to select an exit channel. A simple algebra has been developed which provides theoretical estimates in good agreement with these experimental results. It is demonstrated that, depending on both the γ-spectrometer and ancillary detector performances, much better peak-to-background can be obtained by such a coupling. For the same peak-to-background ratio, the use of an ancillary detector allows for a lower γ-ray coincidence level and therefore improves the statistics. Ways to select the most appropriate ancillary detector are given. The ability of the ancillary detector to provide a total Doppler shift correction is crucial for the improvement of the peak-to-background ratio.
Published: 1997
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21. Fission probabilities ofAm242,Cm243, andCm244induced by transfer reactions

Author: B. Jurado, Paola Marini, I. Tsekhanovich, Q. Ducasse, L. Mathieu, G. Barreau, S. Czajkowski, Grégoire Kessedjian, G. Boutoux, and M. Aiche
Subjects: Physics, Nuclear and High Energy Physics, Transfer (group theory), 010308 nuclear & particles physics, Fission, Nuclear Theory, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract: We have measured the fission probabilities of $^{242}\mathrm{Am},^{243}\mathrm{Cm}$, and $^{244}\mathrm{Cm}$ induced by the transfer reactions $^{243}\mathrm{Am}(^{3}\mathrm{He},^{4}\mathrm{He}),^{243}\mathrm{Am}(^{3}\mathrm{He},t)$, and $^{243}\mathrm{Am}(^{3}\mathrm{He},d)$, respectively. The details of the experimental procedure and a rigorous uncertainty analysis, including a correlation matrix, are presented. For $^{243}\mathrm{Cm}$ our data show clear structures well below the fission threshold. To our knowledge, it is the first time that these structures have been observed for this nucleus. We have compared the measured fission probabilities to calculations based on the statistical model to obtain information on the fission barriers of the produced fissioning nuclei.
Published: 2015
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22. Determination of the 233Pa(n, γ) capture cross section up to neutron energies of 1 MeV using the transfer reaction 232Th(3He, p)234Pa∗

Author: D. Dassié, L. Perrot, E. Berthoumieux, F. Gunsing, S. Czajkowski, S. Boyer, Ch. Theisen, M. Aiche, C. Grosjean, G. Aerts, B. Haas, A. Guiral, J. N. Wilson, N. Thiollière, G. Barreau, and B. Osmanov
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Inelastic scattering, Scintillator, 01 natural sciences, 7. Clean energy, Neutron temperature, Charged particle, Cross section (physics), 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract: The γ -ray emission probability distribution of 234 Pa ∗ has been measured between 5.2 and 6.2 MeV excitation energy using the transfer reaction 232 Th( 3 He, p) 234 Pa ∗ at an incident 3 He energy of 24 MeV. The experimental set-up is made of four liquid scintillator C 6 D 6 detectors and four Si telescopes arranged to detect γ rays and charged particles in coincidence. In order to determine the total number of γ -ray cascades in a given nucleus, the raw experimental detected gamma-ray events have to be corrected by the weighting function technique. This weighting requires complete knowledge of the efficiency and response functions for the C 6 D 6 detector set-up and surroundings. These have been determined experimentally using gamma-ray sources, inelastic scattering reactions and transfer reactions on light nuclei. Simulations which reproduce successfully the detector response and efficiency are presented. From these measurements, the (n, γ ) capture cross section of 233 Pa, in the neutron energy range 0 to 1 MeV, has been deduced via the product of the measured γ emission probability of 234 Pa ∗ with the calculated compound nucleus formation cross section of the reaction 233 Pa + n. A comparison between existing data bases or recent predictions and the present results is also made.
Published: 2006
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23. Multiparticle excitations in 194Pb

Author: H. Sergolle, F. Azaiez, Y. Le Coz, N. Perrin, I. Deloncle, B.J.P. Gall, J. Simpson, J. Duprat, M. Kaci, R. M. Clark, R. Duffait, Marco Meyer, N. Poffé, A. G. Smith, C. W. Beausang, M. Aiche, G. Bastin, J.F. Sharpey-Schafer, N. Redon, E. S. Paul, F. Hannachi, R. Wadsworth, K. Hauschild, C. Bourgeois, Malcolm J. Joyce, A. Korichi, C. Schück, and M.G. Porquet
Subjects: Coupling, Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, Fermi level, Dipole, symbols.namesake, symbols, Neutron, Atomic physics, Nuclear Experiment, Spin (physics), Excitation
Abstract: High-spin states of 194 Pb have been populated by the reaction 184 W( 16 O, 6n) at 113 MeV beam energy and studied using the EUROGAM-1 array. The level scheme has been extended up to spin of 33 ℏ and excitation energy of 11.1 MeV. The high-spin part of the level scheme is dominated by bands of dipole transitions. New dipole bands have been observed and the configurations of their band heads are discussed. Besides the well-known coupling of the K π =11 − two-proton state to several νi 13/2 rotation-aligned neutron states, the K π =8 + two-proton state is also involved. Such a coupling is identified for the first time in a lead isotope. Moreover, the K π =11 − two-proton state is coupled to the rotation-aligned proton pair ( πh 11/2 ) 2 . Thus many multiparticle configurations involving all the high- j subshells located around the proton and neutron Fermi levels, πh 11/2 , πh 9/2 , πi 13/2 , and νi 13/2 have been identified in this nucleus.
Published: 2002
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24. Co-existing coupling schemes at high spin in 166Hf

Author: D. Ringkjøbing Jensen, J. Domscheit, G. B. Hagemann, M. Bergström, B. Herskind, B. S. Nielsen, G. Sletten, P. G. Varmette, S. Törmänen, H. Hübel, W. Ma, A. Bracco, F. Camera, F. Demaria, S. Frattini, B. Million, D. Napoli, A. Maj, B. M. Nyakó, D. T. Joss, and M. Aiche
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Free particle, Lattice (order), High Energy Physics::Phenomenology, Time evolution, High Energy Physics::Experiment, Polarization (waves), Molecular physics, Quantum
Abstract: Two types of particles, A and B with their corresponding antiparticles, are defined in a one dimensional cyclic lattice with an odd number of sites. In each step of time evolution, each particle acts as a source for the polarization field of the other type of particle with nonlocal action but with an effect decreasing with the distance: A -->...\bar{B} B \bar{B} B \bar{B} ... ; B --> A \bar{A} A \bar{A} A ... . It is shown that the combined distribution of these particles obeys the time evolution of a free particle as given by quantum mechanics.
Published: 2000
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25. Energy sharing in the deexcitation of the90Ru compound nucleus via thepαchannel

Author: G. Barreau, A. Principe, A. Brondi, M. M. Aléonard, J. N. Scheurer, M. Harston, J.P. Goudour, D. Cabaussel, D. Curien, D. Boivin, M. Aiche, F. Bourgine, R. Moro, G. La Rana, J.F. Chemin, Emanuele Vardaci, and T.P. Doan
Subjects: Physics, Nuclear and High Energy Physics, Angular momentum, Spectrometer, Available energy, Evaporation, Alpha particle, Atomic physics, Charged particle, Energy (signal processing), Excitation
Abstract: Using the 4$\ensuremath{\pi}$ light charged-particle detector DIAMANT in combination with the $\ensuremath{\gamma}$-ray spectrometer EUROGAM II, the decay of the ${}^{90}$Ru compound nucleus via the $p\ensuremath{\alpha}$ channel was studied. These nuclei were produced at an excitation energy of 54.9 MeV and with a maximum angular momentum of 37$\ensuremath{\Elzxh}$ by the 120 MeV ${}^{32}$S + ${}^{58}$Ni reaction. The measurement of the energy of the two particles allowed the determination of the energy distribution of the entry states. A particular behavior of the sharing of the available energy between the two particles was found: For increasing values of the entry-state energy, the mean energy for protons remains almost constant while for alpha particles it decreases. This behavior is well reproduced by the evaporation code LILITA_N95. The physics underlying the decay is discussed in the framework of the statistical model which predicts a strong correlation between the excitation energy and the angular momentum of the evaporation residue. This result encourages the use of the $p\ensuremath{\alpha}$ channel to select the excitation energy and the angular momentum of the evaporation residue for superdeformed band studies.
Published: 1997
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26. Ionic charge dependence of the internal conversion coefficient and nuclear lifetime of the first excited state in125Te

Author: G. Bogaert, C. Grunberg, J. P. Thibaud, J.F. Chemin, A. Lefebvre, F. Attallah, W. E. Meyerhof, J. N. Scheurer, J. Kiener, M. Aiche, J. R. Grandin, P. Aguer, 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, Excited state, 0103 physical sciences, State dependence, Atomic physics, 010306 general physics, Internal conversion coefficient
Abstract: We have studied the ionic charge state dependence of the nuclear lifetime of the 35.5-keV first excited state of {sup 125}Te. We found for the 47{sup +} and 48{sup +} ions, 400 and 670{percent} variations with respect to the neutral-atom half-life (1.49 ns). These unusually large effects are due to the energetic blocking of the K-shell internal conversion as the charge state increases past 47{sup +}. For the 46{sup +}, we suggest a new internal conversion mode without any electron emission into the energy continuum. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997
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27. Insights on the population of the superdeformed bands using the EUROGAMII – DIAMANT apparatus

Author: G. LA RANA, A. BRONDI, R. MORO, E. VARDACI, M. AICHE, M. M. ALÉONARD, G. BARREAU, D. BOIVIN, F. BOURGINE, J. F. CHEMIN, J. N. SCHEURER, D. CURIEN, G. DUCHENE, F. A. BECK, B. HAAS, J. P. VIVIEN, G. DE FRANCE, F. HANNACHI, K Yoshida, S Kubono, I Tanihata, C Signorini, LA RANA, Giovanni, Brondi, Augusto, Moro, RENATA EMILIA MARIA, Vardaci, Emanuele, M., Aiche, M. M., Aléonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, J. N., Scheurer, D., Curien, G., Duchene, F. A., Beck, B., Haa, J. P., Vivien, G., DE FRANCE, and F., Hannachi
Subjects: Nuclear physics, Physics, Particle physics, education.field_of_study, superdeformed band, Population, EUROGAM, education, ancillary detector, DIAMANT
Abstract: Experiments to study the decay of hot composite nuclei have been carried out with EUROGAM II γ-ray spectrometer, coupled to the DIAMANT charged-particle detector, at the VIVITRON accelerator at IReS in Strasbourg. Some relevant aspects related to the population of superdeformed bands have been addressed, on the basis of very exclusive data. We present the results for the composite nuclei 90Ru and 160Er produced in the reactions 120, 130 MeV 32S + 58Ni, and 191 MeV 37Cl + 123Sb, at excitation energies Ex≅ 55, 61 and 92 MeV, respectively Evidence is given of effects related to the angular momentum as well as to the location of the entry region.
Published: 2003

28. Correction method for Doppler broadened $\gamma$-ray lines using the linear momentum of the evaporated charged particles in heavy-ion induced fusion-evaporation reactions

Author: Emanuele Vardaci, G. Barreau, J. N. Scheurer, M. Harston, A. Brondi, G. La Rana, D. Cabaussel, F. Hannachi, R. Moro, F. Bourgine, M. M. Aléonard, J.F. Chemin, D. Boivin, M. Aiche, D. Curien, 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), EUROBALL, M., Aiche, M. M., Alonard, G., Barreau, D., Boivin, F., Bourgine, D., Cabaussel, J. F., Chemin, M., Harston, J. N., Scheurer, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Brondi, Augusto, Vardaci, Emanuele, and D. CURIEN, F. HANNACHI
Subjects: Nuclear and High Energy Physics, Light charged particle, Fusion–evaporation, Astrophysics::High Energy Astrophysical Phenomena, EUROBALL SPECTROMETER, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, SUPERDEFORMED BAND, Coincidence, DIAMANT, symbols.namesake, GAMMASPHERE, 0103 physical sciences, Doppler shift, Nuclear Experiment, 010306 general physics, COMPOUND NUCLEUS, GAMMA SPECTROSCOPY, Instrumentation, DETECTOR, Physics, Fusion, Spectrometer, 010308 nuclear & particles physics, Detector, Evaporation (deposition), Charged particle, EUROGAM II, symbols, Granularity, Atomic physics, Doppler effect
Abstract: A method based on the conservation of linear momentum is used to correct the position and the width of the γ-ray lines of the residual nucleus produced in heavy-ion induced fusion–evaporation reactions. This method implies the measurement of the total number of the emitted particles, their masses, energies and directions of emission in coincidence with the prompt γ-rays. It has been applied to the 120 MeV 32 S + 58 Ni reaction whose data have been collected using the high efficiency and large granularity 4π light charged particle detector DIAMANT, coupled to the 4π γ-ray spectrometer EUROGAM II.
Published: 2003
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29. ANDES Measurements for Advanced Reactor Systems

Author: Peter Schillebeeckx, A. Bacquias, Stefan Kopecky, M. Aiche, C. Rodrigues Tajes, Carlos Guerrero, E Gonzalez Romero, Alexandru Negret, Ari Jokinen, F. Farget, C. Rouki, M. Nyman, F. Gunsing, Nicola Colonna, Heikki Penttilä, D. Cano-Ott, B. Jurado, Franz-Josef Hambsch, C. Lampoudis, P. Salvador Castiñeira, Fabio Belloni, X. Derckx, E. Berthoumieux, A. J. M. Plompen, Sami Rinta-Antila, Veli Kolhinen, C. Borcea, M. Kerveno, L. Mathieu, P. Dessagne, Marco Calviani, Isabel S. Gonçalves, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Aval du cycle et Energie Nucléaire (ACEN), 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 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), 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 Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, ta114, Fission, Nuclear data, Fission product yield, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, Neutron capture, Neutron, Nuclear Experiment, Delayed neutron
Abstract: A significant number of new measurements was undertaken by the ANDES “Measurements for advanced reactor systems” initiative. These new measurements include neutron inelastic scattering from 23 Na, Mo, Zr, and 238 U, neutron capture cross sections of 238 U, 241 Am, neutron induced fission cross sections of 240 Pu, 242 Pu, 241 Am, 243 Am and 245 Cm, and measurements that explore the limits of the surrogate technique. The latter study the feasibility of inferring neutron capture cross sections for Cm isotopes, the neutron-induced fission cross section of 238 Pu and fission yields and fission probabilities through full Z and A identification in inverse kinematics for isotopes of Pu, Am, Cm and Cf. Finally, four isotopes are studied which are important to improve predictions for delayed neutron precursors and decay heat by total absorption gamma-ray spectrometry ( 88 Br, 94 Rb, 95 Rb, 137 I). The measurements which are performed at state-of-the-art European facilities have the ambition to achieve the lowest possible uncertainty, and to come as close as is reasonably achievable to the target uncertainties established by sensitivity studies. An overview is presented of the activities and achievements, leaving detailed expositions to the various parties contributing to the conference.
Published: 2013
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30. Development of a gaseous recoil-proton detector for neutron flux measurements between 0.2 and 2 MeV neutron energy

Author: I. Tsekhanovich, B. Jurado, T. Cheron, P. Hellmuth, J. L. Pedroza, L. Mathieu, Paola Marini, M. Aiche, and S. Czajkowski
Subjects: Materials science, Proton, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Neutron radiation, 01 natural sciences, Particle detector, Neutron temperature, Nuclear physics, Radiation flux, Neutron flux, 0103 physical sciences, Physics::Accelerator Physics, Neutron detection, Neutron, Nuclear Experiment, 010306 general physics
Abstract: Absolute measurements of neutron fluence are an essential prerequisite of neutron-induced cross section measurements, neutron beam lines characterisation and dosimetric investigations. Precise neutron flux measurements can be performed with respect to the H(n,p) elastic cross section. The use of this technique, with silicon proton recoil detectors, is not straightforward below incident neutron energy of 1 MeV, due to a high background in the detected proton spectrum. Experiments carried out at the AIFIRA facility identified its origin. Based on these investigations, a gaseous recoil-proton detector has been designed, with a reduced low energy background. Preliminary results of the first tests of the developed detector are discussed here.
Published: 2017
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31. Measurement of high-energy prompt gamma-rays from neutron induced fission of U-235

Author: Katsuhisa Nishio, S. Czajkowski, Song Guo, Ulli Köster, Franz-Josef Hambsch, I. Tsekhanovich, Kentaro Hirose, C. M. Petrache, L. Mathieu, R. Orlandi, Andrew Pollitt, R. Leguillon, Torsten Soldner, Tatsuhiko Ogawa, Hiroyuki Makii, A. Astier, Robert Frost, M. Aiche, Advanced Science Research Center, Japan Atomic Energy Agency, Japan Atomic Energy Agency, Institut Laue-Langevin (ILL), ILL, JRC Institute for Reference Materials and Measurements [Geel] (IRMM), European Commission - Joint Research Centre [Geel] (JRC), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 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), School of Physics and Astronomy [Manchester], and University of Manchester [Manchester]
Subjects: Physics, High energy, 010308 nuclear & particles physics, Fission, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Measure (physics), Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Beamline, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment
Abstract: International audience; We have developed a new setup to measure prompt γ-rays from the 235 U(n th , f) reaction. The setup consists of two multi-wire proportional counters (MWPCs) to detect the fission fragments, two LaBr 3 (Ce) scintillators to measure the γ-rays. The highly efficient setup was installed at the PF1B beam line of the Institut Laue Langevin (ILL). We have successfully measured the γ-ray spectrum up to about 20 MeV for the fist time in neutron-induced fission.
Published: 2017
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32. Constant-temperature level densities in the quasi-continuum of Th and U isotopes

Author: Therese Renstrøm, J.N. Wilson, Baptist Leniau, L. A. Bernstein, Trine Wiborg Hagen, S. J. Rose, M. Wiedeking, T. G. Tornyi, Quentin Ducasse, Ann-Cecilie Larsen, Beatriz Jurado, M. Aiche, F. Giacoppo, M. Lebois, Magne Guttormsen, Gry Merete Tveten, Andreas Görgen, Sunniva Siem, F. Gunsing, Aval du cycle et Energie Nucléaire (ACEN), 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 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université 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), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, FOS: Physical sciences, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Heat capacity, Spectral line, Atomic orbital, Természettudományok, 0103 physical sciences, Neutron, Atomic physics, Entropy (energy dispersal), Cooper pair, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Excitation
Abstract: Particle-gamma coincidences have been measured to obtain gamma-ray spectra as a function of excitation energy for 231-233Th and 237-239U. The level densities, which were extracted using the Oslo method, show a constant temperature behavior. The isotopes display very similar temperatures in the quasi-continuum, however, the even-odd isotopes reveal a constant entropy increase Delta S compared to their even-even neighbors. The entropy excess depends on available orbitals for the last unpaired valence neutron of the heated nuclear system. Also, experimental microcanonical temperature and heat capacity have been extracted. Several poles in the heat capacity curve support the idea that an almost continuous melting of Cooper pairs is responsible for the constant-temperature behavior., 9 figures
Published: 2013
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33. Charge State Blocking ofK-Shell Internal Conversion in125Te

Author: J. Kiener, J. P. Grandin, M. Aiche, C. Grunberg, A. Lefebvre, W. E. Meyerhof, F. Attallah, J. F. Chemin, J. N. Scheurer, G. Bogaert, P. Aguer, and J. P. Thibaud
Subjects: Materials science, 010308 nuclear & particles physics, Blocking (radio), Electron shell, General Physics and Astronomy, Charge (physics), State (functional analysis), 01 natural sciences, Ion, Internal conversion, Excited state, 0103 physical sciences, State dependence, Atomic physics, 010306 general physics
Abstract: We have studied the atomic charge state dependence of the nuclear lifetime of the 35.5-keV first excited state of {sup 125}Te. For the 47{sup +} and 48{sup +} ions, 300% and 640% increases, respectively, of the half-life were found with respect to the neutral-atom value (1.49 ns). These unusually large effects are due to the energetic blocking of {ital K}-shell internal conversion as the charge state increases past 47{sup +}.
Published: 1995
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34. Insights on the population of the superdeformed bands using the EUROGAM II-DIAMANT apparatus

Author: LA RANA, GIOVANNI, A. BRONDI, R. MORO, VARDACI, EMANUELE, M. AICHE, M. M. ALÉONARD, G. BARREAU, D. BOIVIN, F. BOURGINE, J. F. CHEMIN, D. CURIEN, G. DUCHENE, LA RANA, Giovanni, A., Brondi, R., Moro, Vardaci, Emanuele, M., Aiche, M. M., Aléonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, D., Curien, and G., Duchene
Published: 2001

35. 243Am neutron-induced fission cross section in the fast neutron energy range

Author: Stephan Oberstedt, A. Bidaud, B. Jurado, David K. Shuh, I. AlMahamid, D. Dassié, F.-J. Hambsch, J. N. Wilson, J. Floyd, S. Czajkowski, Grégoire Kessedjian, Wayne W. Lukens, L. Tassan-Got, M. Aiche, G. Barreau, B. Haas, L. Mathieu, Aval du cycle et Energie Nucléaire (ACEN), 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 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), 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: Elastic scattering, Physics, Nuclear and High Energy Physics, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Nuclear Theory, Order (ring theory), 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, Sensitivity (control systems), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The existing evaluations of the ${}^{243}$Am neutron-induced fission cross section have been questioned by recent measurements performed at the GNEISS facility. In the neutron energy range from 1 to 6 MeV, the GNEISS data present deviations of more than 15$%$ with respect to the evaluations. In order to solve this problem, we have measured this cross section in reference to three different standard cross sections. The first standard reaction used corresponds to the neutron on proton elastic scattering cross section, which is known with a precision better than 0.5$%$ over a wide neutron-energy range of 1 meV to 20 MeV. The other two experiments were conducted in reference to the ${}^{235}$U(n, f) and ${}^{238}$U(n, f) reactions. The comparison between these three standard reactions ensures that systematic parameters have been correctly evaluated. Moreover, a sensitivity analysis of parameters and correlations of parameters is described and a complete variance-covariance matrix of the measurements is presented and discussed.
Published: 2012
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36. Feeding of ND and SD bands in Dy-151,Dy-152 nuclei

Author: J. N. Scheurer, M. Aiche, M. M. Aleonard, G. Barreau, D. Boivin, F. Bourgine, J. F. Chemin, T. P. Dean, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, A. Principe, VARDACI, EMANUELE, D. Curien, G. Duchene, G. de France, F. A. Beck, B. Haas, J. P. Vivien, F. Hannachi, J. N., Scheurer, M., Aiche, M. M., Aleonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, T. P., Dean, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, A., Principe, Vardaci, Emanuele, D., Curien, G., Duchene, G., de France, F. A., Beck, B., Haa, J. P., Vivien, and F., Hannachi
Subjects: SUPERDEFORMED BANDS, IPERDEFORMED BANDS, ALPHA-GAMMA COINCIDENCES
Abstract: alpha -energy distributions, associated with ND and SD states in Dy-151,Dy-152, have been obtained from the reaction Cl-37+Sb-123 at 191 MeV. Contrarily to the case of Dy-152, they are very different from each other in the case of Dy-151. A description in terms of energy localization of entry states is given.
Published: 2000

37. The electronion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR) - A conceptual design study

Author: E. Garrido, Igor Meshkov, E. Khan, Pedro Sarriguren, B. Franzke, A. Chatillon, Marielle Chartier, M. Aiche, D. Doré, B. Jurado, Dirk Rudolph, I.A. Koop, S. N. Ershov, M. Fujiwara, Mikhail V. Zhukov, Roy Crawford Lemmon, R. Johnson, S. A. Krupko, D. N. Kadrev, S. Karataglidis, Yurii M. Shatunov, G. Belier, Thomas Nilsson, Oliver Kester, C. Schmitt, C. Fernandez Ramirez, E. Moya de Guerra, Norbert Pietralla, S. Czajkowski, F. Nolden, M. K. Gaidarov, Thomas Rauscher, G. P. A. Berg, E. Berthoumieux, Harald Merkel, D. Ridikas, I. Seleznev, Achim Richter, Andreas Zilges, F. Farget, A. Kelic-Heil, J. A. Caballero, L. V. Chulkov, Tatuya Adachi, V. Lisin, Helmut Weick, H. Lenske, Håkan T Johansson, Kai Hencken, Anton Nikolaev Antonov, K.-H. Schmidt, B. Krusche, A.A. Korsheninnikov, A. M. Rodin, Björn Jonson, Y. Litvinov, A.V. Otboev, P. Beller, Nasser Kalantar-Nayestanaki, U. Müller, Ch. Scheidenberger, L. V. Grigorenko, A. Dolinskii, N. Kurz, D. G. Jenkins, Laurent Tassan-Got, Pavel Golubev, N. V. Rudnev, Thomas Aumann, Andreas Martin Heinz, Seigo Kato, J. Taieb, A.N. Skrinsky, R. Alvarez Rodriguez, W. N. Catford, M. J. G. Borge, A. A. Ogloblin, J. Jourdan, A. V. Gorshkov, G. Münzenberg, Elena Litvinova, A. Letourneau, Takeshi Suda, A. Artukh, B. V. Danilin, G. Schrieder, A.N. Vorontsov, G. M. Ter-Akopian, P.V. Logatchov, D.I. Shvartz, S. Hamieh, K. Boretzky, Sergei Kamerdzhiev, A. N. Mushkarenkov, C. J. Barton, Peter Egelhof, Jim Al-Khalili, H. Emling, Paul Stevenson, Carlos A. Bertulani, Arnd R. Junghans, D. M. Cullen, E. Dupont, Dirk Trautmann, Joachim Enders, M. Steck, J. Udias-Moinelo, L.M. Fraile Prieto, M. O. Distler, Vasilii V. Parkhomchuk, Mohsen Harakeh, Göran Hugo Nyman, M. V. Ivanov, Vladimir Avdeichikov, Stefano Panebianco, Y. Sereda, J.E. Amaro Soriano, S.V. Shiyankov, D. Kiselev, A. S. Fomichev, E. Syresin, Hans Geissel, V. Volkov, L. Audouin, E. A. Kuzmin, Y. Teterev, S. Klygin, A. Polonski, A. A. Turinge, S. I. Sidorchuk, T. Granier, H. J. Wörtche, V. G. Nedorezov, P.Y. Shatunov, J. R. Vignote, J. Lopez Herraiz, A.M. Lallena Rojo, D.N. Shatilov, Haik Simon, Y. Grishkin, G. Barreau, S. V. Stepantsov, M. S. Golovkov, 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), KVI - Center for Advanced Radiation Technology, 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Nuclear and High Energy Physics, electronscattering, FORM-FACTORS, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], DATA-ACQUISITION SYSTEM, NUCLEAR-STRUCTURE, 01 natural sciences, BINDING-ENERGIES, CHARGE-DENSITY DISTRIBUTIONS, Ion, CROSS-SECTIONS, Nuclear physics, Nuclei far off stability, Conceptual design, eA collider, 0103 physical sciences, CENTRAL DEPRESSION, Electron scattering, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, Scattering, 29.27.-a, 25.30.Bf,25.30.Dh,21.10.Ft,29.20.Dh,29.30.-h, RELATIVISTIC HEAVY-IONS, EXOTIC NUCLEI, Facility for Antiproton and Ion Research, GIANT-RESONANCES, Storage ring
Abstract: The electronion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the International Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented. © 2011 Elsevier B.V. All rights reserved., The authors acknowledge ﬁnancial support from the EC via the INTAS pro- gramme, grants No. 03-54-6545 and 05-1000008-8272. This work was partially supported by the Hessian LOEWE initiative Helmholtz International Center for FAIR
Published: 2011
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38. Alpha energy distribution as a probe for the feeding of ND and SD bands in Dy-151,Dy-152 nuclei

Author: M. Aiche, M. M. Aleonard, G. Barreau, D. Boivin, F. Bourgine, J. F. Chemin, J. N. Scheurer, T. P. Doan, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, A. Principe, VARDACI, EMANUELE, D. Curien, G. Duchene, G. de France, F. A. Beck, B. Haas, J. P. Vivien, F. Hannachi, M., Aiche, M. M., Aleonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, J. N., Scheurer, T. P., Doan, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, A., Principe, Vardaci, Emanuele, D., Curien, G., Duchene, G., de France, F. A., Beck, B., Haa, J. P., Vivien, and F., Hannachi
Subjects: COINCIDENCE, HEAVY-ION REACTIONS, SUPERDEFORMED BANDS, POPULATION
Abstract: The study of the alpha-particle energy distributions associated with ND and SD states in Dy-151,Dy-152 has been carried out. The Dy isotopes were produced in the reaction Cl-37+Sb-123 at 191 MeV via the (alpha 5n) and (alpha 4n) channels, respectively. In Dy-151 the alpha-particle energy distributions associated to ND and SD are very different from each other, both at the low and high energy sides inducing a difference of 3 MeV in the alpha-particle mean energy. In Dy-152 the situation is different; the alpha-particle spectral shapes are similar and a difference in the alpha-particle mean energy of only 0.7 MeV is deduced. A description in terms of energy localization of entry states is given.
Published: 1999

39. ELISe: a new facility for unprecedented experimental nuclear fission studies

Author: E. Dupont, A. Chatillon, M. Aiche, Burkart Voss, G. Belier, C. Schmitt, J. Peyre, J. Taieb, L. Audouin, B. Jurado, V. Ricciardi, S. Czajkowski, P. Rosier, E. Bertoumieux, Alain Letourneau, C. Jouanne, A. Kelic, T. Granier, C. Diop, Diane Doré, M. Coste-Delclaux, L. Tassan-Got, K.-H. Schmidt, S. Panebianco, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service des Réacteurs et de Mathématiques Appliquées (SERMA), Département de Modélisation des Systèmes et Structures (DM2S), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), 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), 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), 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), Département de Physique Nucléaire (ex SPhN) (DPHN), 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)-Université Paris-Saclay, Service d’Études des Réacteurs et de Mathématiques Appliquées (SERMA), 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), 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), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Nuclear Theory, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, law, Nuclear fission, 0103 physical sciences, Physics::Accelerator Physics, Neutron, 010306 general physics, Collider, Nuclear Experiment
Abstract: A novel experimental program aiming to study the properties of fragments and neutrons emitted in the fission process has been initiated. The experiment will be held at the ELISe electron-ion collider to be constructed at GSI, Darmstadt in the framework of the FAIR extension of the facility. The experiment will take advantage of the inverse kinematics allowing, in particular, a total mass and charge resolution for all fission fragments.
Published: 2009
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40. Insight on the Compound Nucleus Decay via the p-alpha channel

Author: VARDACI, EMANUELE, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, F. Bourgine, D. Cabaussel, D. Boivin, M. Aiche, M. M. Aleonard, G. Barreau, J. F. Chemin, T. P. Doan, J. P. Goudour, M. Harston, J. N. Scheurer, A. Principe, D. Curien, Y. Oganessian, R. Kalpakchieva, Vardaci, Emanuele, F., Bourgine, D., Cabaussel, D., Boivin, M., Aiche, M. M., Aleonard, G., Barreau, J. F., Chemin, T. P., Doan, J. P., Goudour, M., Harston, J. N., Scheurer, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, A., Principe, and D., Curien
Subjects: gamma array, statistical model, compound nucleus decay, gamma-particle coincidences
Abstract: The decay of Ru-90 compound nucleus via the p-alpha channel (about 1% of the fusion cross-section) was studied using the 4pi light charged-particle detector DIAMANT coupled to the gamma-ray spectrometer EUROGAM-II. The high selectivity of the apparatus allowed the determination of the total kinetic energy of the two particles with good statistics. Particle energy spectra and angular correlations have been analysed as a function of the excitation energy of the entry states and compared to statistical model calculations. As the excitation energy of the entry states increases, the mean energy carried out by the protons remains almost constantwhereas the one of the alpha particle decreases. This behaviour is well reproduced by the evaporation code LILITA_N85, which predicts a strong correlation between the excitation energy and the angular momentum of the evaporation residues. This findings could help to enhance the population of superdeformed bands by using the total kinetic energy of the two particles as a gating condition.
Published: 1998

41. Development of a gaseous proton-recoil detector for fission cross section measurements below 1 MeV neutron energy

Author: L. Mathieu, B. Jurado, P. Marini, S. Czajkowski, I. Tsekhanovich, and M. Aiche
Subjects: Materials science, Proton, Fission, business.industry, Physics, QC1-999, Nuclear Theory, Detector, Measure (physics), Electrical engineering, Neutron temperature, Nuclear physics, Cross section (physics), Neutron flux, Proton recoil, Nuclear Experiment, business
Abstract: The elastic H(n,p) reaction is sometimes used to measure neutron flux, in order to produce high precision measurements. The use of this technique is not straightforward to use below incident neutron energy of 1 MeV, due to a high background in the detected proton spectrum. Experiments have been carried out at the AIFIRA facility to investigate such background and determine its origin and components. Based on these investigations, a gaseous proton-recoil detector has been designed, with a reduced low energy background.
Published: 2016
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42. First results with DIAMANT and EUROGAM

Author: J.P. Goudour, A. Brondi, Emanuele Vardaci, R. Moro, J. N. Scheurer, M. Harston, F. Bourgine, J.F. Chemin, M. Aiche, G. La Rana, D. Cabaussel-Sellam, D. Curien, G. Barreau, M. M. Aléonard, 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), EUROGAM, Chambon, Pascale, M., Aiche, M. M., Aleonard, G., Barreau, F., Bourgine, Brondi, Augusto, D., Cabausselsellam, D., Curien, J. F., Chemin, J. P., Goudour, M., Harston, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, J. N., Scheurer, and Vardaci, Emanuele
Subjects: Physics, Coupling, LIGHT CHARGED PARTICLE ARRAY, Nuclear and High Energy Physics, Fusion, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Detector, Evaporation, EUROGAM, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, DIAMANT, Charged particle, Nuclear physics, symbols.namesake, 0103 physical sciences, symbols, Nuclear fusion, Particle, Atomic physics, Nuclear Experiment, 010306 general physics, Doppler effect
Abstract: The coupling of efficient particle and gamma detection arrays is a powerful tool to study the deexcitation of both compound and residual nuclei in fusion evaporation reactions. We show first results obtained coupling the DIAMANT (4 pi light charged particle array) and EUROGAM (4 pi gamma array) detectors demonstrating the improvement in the resolving power by this combination. For gamma rays of similar or equal to 800keV improvements in the Doppler correction up to 50% have been reached for the 2 alpha exit channel following the fusion of S-32+Ni-58 at 120 MeV bombarding energy (beta similar or equal to 3%).
Published: 1997

43. Energy sharing in the deexcitation of the Ru-90 compound nucleus via the p alpha channel

Author: F. Bourgine, D. Cabaussel, D. Boivin, M. Aiche, M. M. Aleonard, G. Barreau, J. F. Chemin, T. P. Doan, J. P. Goudour, M. Harston, J. N. Scheurer, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, A. Principe, VARDACI, EMANUELE, D. Curien, F., Bourgine, D., Cabaussel, D., Boivin, M., Aiche, M. M., Aleonard, G., Barreau, J. F., Chemin, T. P., Doan, J. P., Goudour, M., Harston, J. N., Scheurer, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, A., Principe, Vardaci, Emanuele, and D., Curien
Subjects: PROTON EVAPORATION SPECTRA, HIGH SPIN STATES, SUPERDEFORMED BAND, DIAMANT, PARTICLE EVAPORATION
Abstract: Using the 4 pi light charged-particle detector DIAMANT in combination with the gamma-ray spectrometer EUROGAM II, the decay of the Ru-90 compound nucleus via the p alpha channel was studied. These nuclei were produced at an excitation energy of 54.9 MeV and with a maximum angular momentum of 37 (h) over bar by the 120 MeV S-32 + Ni-58 reaction. The measurement of the energy of the two particles allowed the determination of the energy distribution of the entry states. A particular behavior of the sharing of the available energy between the two particles was found: For increasing values of the entry-state energy, the mean energy for protons remains almost constant while for alpha panicles it decreases. This behavior is well reproduced by the evaporation code LILITA_N95. The physics underlying the decay is discussed in the framework of the statistical model which predicts a strong correlation between the excitation energy and the angular momentum of the evaporation residue. This result encourages the use of the p alpha channel to select the excitation energy and the angular momentum of the evaporation residue for superdeformed band studies.
Published: 1997

44. Energy sharing in the de-excitation of 44Ti and 90Ru compound nuclei via pa and 2a channels

Author: F. BOURGINE, D. CABAUSSEL, D. BOIVIN, M. AICHE, J. F. CHEMIN, J. N. SCHEURER, M. M. ALEONARD, G. BARREAU, T. P. DOAN, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, F., Bourgine, D., Cabaussel, D., Boivin, M., Aiche, J. F., Chemin, J. N., Scheurer, M. M., Aleonard, G., Barreau, T. P., Doan, Brondi, Augusto, LA RANA, Giovanni, and Moro, RENATA EMILIA MARIA
Published: 1997

45. First results with DIAMANT and EUROGAM

Author: M. AICHE, M. M. ALEONARD, G. BARREAU, F. BOURGINE, D. CABAUSSEL SELLAM, D. CURIEN, J. F. CHEMIN, J. P. GOUDOUR, M. HARSTON, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, M., Aiche, M. M., Aleonard, G., Barreau, F., Bourgine, Brondi, Augusto, D., CABAUSSEL SELLAM, D., Curien, J. F., Chemin, J. P., Goudour, M., Harston, LA RANA, Giovanni, and Moro, RENATA EMILIA MARIA
Published: 1997

46. Fission Cross Sections and Fission-Fragment Mass Yields via the Surrogate Reaction Method

Author: B. Jurado, G. Kessedjian, M. Aiche, G. Barreau, A. Bidaud, S. Czajkowski, D. Dassié, B. Haas, L. Mathieu, B. Osmanov, L. Audouin, N. Capellán, L. Tassan-Got, J. N. Wilson, E. Berthoumieux, F. Gunsing, Ch. Theisen, O. Serot, E. Bauge, I. Ahmad, J. P. Greene, R. V. F. Janssens, Jutta Escher, Frank S. Dietrich, Toshihiko Kawano, Ian J. Thompson, 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), 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, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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: Range (particle radiation), Mass distribution, 010308 nuclear & particles physics, Chemistry, Fission, Nuclear Theory, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Excitation, ComputingMilieux_MISCELLANEOUS
Abstract: The surrogate reaction method is a powerful tool to infer neutron‐induced data of short‐lived nuclei. After a short overview of the experimental techniques employed in the present surrogate experiments, we will concentrate on a recent measurement to determine neutron‐induced fission cross sections for the actinides 242,243Cm and 241Am. The latest direct neutron‐induced measurement for the 243Cm fission cross section is questioned by our results, since there are differences of more than 60% in the 0.7 to 7 MeV neutron energy range. Our experimental set‐up has also enabled us to measure for the first time the fission fragment “pseudo‐mass” distributions of 243,244,245Cm and 242Am compound nuclei in the excitation energy range from a few MeV to about 25 MeV.
Published: 2007
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47. Epidemiology and Clinical Features of Adults Myelodysplastic Syndromes in Algeria: A Population-Based Study. Review of the Algerian Myelodysplastic Syndromes Study Group

Author: S Nekkal, Z Zouaoui, Brahim Benzineb, F Grifi, Fz Ardjoun, Z Kaci, L Touati, H Ait Ali, M Belhani, S Hamdi, N Lakhdari, B Bendjabellah, N Sidi Mansour, Mohamed Amine Bekadja, Naima Mesli, Rose-Marie Hamladji, M Aiche, S Bougherira, Mohamed Aberkane, Malek Benakli, Samira Zouani, A Graine, MT Abad, N Boudjerra, S Taoussi, M Benlazhar, S Bouabellah, R Ahmed Nacer, Soufi Osmani, A Bachiri, Fz Belkhodja, M Saidi, Hadj Touhami, and N Mehalhal
Subjects: Pediatrics, medicine.medical_specialty, education.field_of_study, Blood transfusion, Hematology, business.industry, Incidence (epidemiology), medicine.medical_treatment, Myelodysplastic syndromes, Immunology, Population, Cell Biology, Hematopoietic stem cell transplantation, medicine.disease, Biochemistry, Internal medicine, Epidemiology, Medicine, business, education, Developed country
Abstract: BACKGROUND: In Algeria, the incidence of hematologic malignancies has been difficult to estimate for many years and MDS incidence is unclear because of historical lack of population-based registration and possibly because of under diagnosis. Today, many hematological centers, including 17 university hospitals, have been developed in the entire north and have useful epidemiological data pertinent to MDS. We studied the incidence of MDS and its subtypes, age distribution, geographic distribution and trends in the rate of diagnosis over the last 5 years in Algeria. DESIGN AND SETTING: Retrospective analysis of nationwide survey of all adult cases of MDS (>16 years) diagnosed between January 2010 and 31 December 2014. PATIENTS AND METHODS: Patients diagnosed with MDS and referred to all departments of hematology at the 17 participating centers between 2010-2014 were identified. Complete demographic and clinical data, laboratory results, treatment modalities were collected and analyzed. RESULTS: Between 2010 and 2014, a total of 243 patients with newly diagnosed MDS have been identified. The sex ratio (M/F) is: 1:08, and the median age is 64.3 years (16 - 82 years). Globally, 27% of MDS are diagnosed in the whole Western region of the country, 56% in the Centre, 14% in the East and 3% in the south. The crude mean annual incidence rate of MDS was 0.07 per 100,000 inhabitants aged ≥15 years old. 11.2% patients were less than 45 years and 42% were older than 70 years.4.3% patients were from rural areas and 6, 2 % were cigarette smokers. Mean hemoglobin level was 7.8 g/dl, mean WBC level was 6134/µl, mean platelets level was 134907/µl, mean VGM level was 92.7 fl and mean ferretin level was 739.31 ng/ml. The mean blood transfusion units were 13.5 units. 36.3% patients had RCMD, 15.9% had RAEB2 and 13.2% had RAEB1. 34.4% patients had cytogenetic abnormalities, and del-5q was more commonly encountered in 22.7%. The IPSS-R was very low in 18.3%, low in 18.3%, intermediate in 11.8%, high in 7.5% and non-specified in 36.6%. Treatment regimens were supportive care (transfusion RBC with chelation, and platelets) and growth factors (EPO, Romiplostine, and G-CSF). At the date of end point, 44% of patients were alive, 26% were death and 31% were lost of follow up. CONCLUSION: Epidemiologic features of our patients are different from the occidental ones. Mean age of presentation of MDS in Algeria is lower than developed countries. The relatively younger age of patients compared to the Western countries may be due to the demographic composition of our population. The annual incidence is still low, but a continuously increasing incidence rate of MDS has been observed throughout the study period and an overall increase in the number of MDS patients diagnosed nationwide over the last five years indicates a need for additional health care resources including curative and therapy-intense strategies, such as stem cell transplant facilities to optimize outcome. Refractory anemia was the most common subtype in both FAB and WHO classification systems and in both genders. The best supportive care was used in all patients in first line treatment and the Iron overload is a permanent feature of MDS. Disclosures No relevant conflicts of interest to declare.
Published: 2015
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48. DIAMANT and EUROGAM : improvements in the observation limits and study of the ^{90}Ru and ^{44}Ti compound nuclei decay

Author: M. M. Aléonard, J.F. Chemin, F. Bourgine, D. Cabaussel, Emanuele Vardaci, J. N. Scheurer, M. Harston, G. Barreau, D. Curien, G. La Rana, R. Moro, A. Brondi, M. Aiche, 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Faessler A., M. M., Aleonard, M., Aiche, G., Barreau, F., Bourgine, D., Cabaussel, J. F., Chemin, M., Harston, J. N., Scheurer, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Vardaci, Emanuele, D., Curien, and Chambon, Pascale
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, LIGHT CHARGED PARTICLE DETECTORS, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, 0103 physical sciences, EUROGAM, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, DIAMANT
Published: 1996

49. DETERMINATION OF MINOR ACTINIDES FISSION CROSS SECTIONS BY MEANS OF TRANSFER REACTIONS

Author: G. Barreau, B. Haas, F. Michel-Sendis, Eric Bauge, John P. Greene, B. Jurado, D. Dassié, Iftikhar Ahmad, R. V. F. Janssens, M. Petit, A. Billebaud, B. Osmanov, M. Aiche, E. Berthoumieux, F. Gunsing, L. Perrot, Ch. Theisen, J. N. Wilson, A. Guiral, C. Grosjean, S. Czajkowski, S. Boyer, 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), H. Goutte, H. Faust, G. Fioni, D. Goutte, GEDEPEON, 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: Curium, nuclei with mass number 220 or higher, 010308 nuclear & particles physics, Fission, Chemistry, Nuclear engineering, Radiochemistry, curium, chemistry.chemical_element, Radioactive waste, Americium, Fission product yield, radioactive waste disposal, Actinide, 25.85.Ec, 25.40.Hs, 28.20.-v, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, americium, Cross section (physics), 0103 physical sciences, fission, neutron-nucleus reactions, 010306 general physics, Long-lived fission product
Abstract: PACS; International audience; We present an original method that allows to determine neutron-induced cross sections of very short-lived minor actinides. This indirect method, based on the use of transfer reactions, has already been applied with success for the determination of the neutron-induced fission and capture cross section of 233Pa, a key nucleus in the 232Th-233U fuel cycle. A recent experiment using this technique has been performed to determine the neutron-induced fission cross sections of 242,243,244Cm and 241Am which are present in the nuclear waste of the current U-Pu fuel cycle. These cross sections are highly relevant for the design of reactors capable to incinerate minor actinides. The first results will be illustrated.
Published: 2006
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50. Determination of the $^{233}$Pa(n,f) reaction cross section from 0,5 to 10 MeV neutron energy using the transfer reaction $^{232}$Th($^{3}$He,p)$^{234}$Pa

Author: A. Billebaud, G. Barreau, B. Haas, D. Dassié, D. Karamanis, C. Grosjean, E. Bauge, S. Andriamonje, R. Lucas, E. Bouchez, M. Aiche, N. Carjan, Ch. Theisen, L. Perrot, Y. Lecoz, S. Boyer, F. Saintamon, A. Hürstel, A. Guiral, M. Petit, S. Czajkowski, F. Gunsing, C. Rizea, Şerban Mişicu, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, Analytical chemistry, Thorium, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Neutron temperature, Nuclear physics, 25.55.Hp, 25.85.Ge, 25.85.Ec, chemistry, 0103 physical sciences, Neutron cross section, Neutron, 010306 general physics, Isotopes of helium
Abstract: The fission probability distributions of 232, 233, 234 Pa and 231 Th have been measured up to an excitation energy of 15 MeV, using the transfer reactions 232 Th( 3 He, t) 232 Pa, 232 Th( 3 He, d) 233 Pa, 232 Th( 3 He, p) 234 Pa and 232 Th( 3 He, 4 He) 231 Th. From these measurements, the neutron induced fission cross sections of 231 Pa, 233 Pa and 230 Th have been determined from the product of the fission probabilities of 232 Pa, 233 Pa and 231 Th respectively with the calculated compound nucleus formation cross sections in the 231 Pa+n, 233 Pa+n and 230 Th+n reactions. The validity of the applied method has been successfully tested with the existing neutron induced fission cross sections of 230 Th and 231 Pa. Special emphasis is put on the 233 Pa(n, f) reaction which is of importance for thorium fueled nuclear reactors. Based on a statistical model analysis of the neutron induced fission cross section as a function of neutron energy, it has been possible to determine the barrier parameters of the 234 Pa fissioning nucleus. Cross sections for the compound nucleus inelastic scatttering 233 Pa(n, n′) and radiative capture 233 Pa(n, γ ) reactions have also been calculated and compared with recent evaluations.
Published: 2004
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