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1. Status of fission fragment observables measured with the LOHENGRIN spectrometer

Author

O Serot, S. Julien-Laferrière, David Bernard, Ulli Köster, Alain Letourneau, M. Ramdhane, L. Thombansen, Paolo Mutti, J. Nicholson, Aurelien Blanc, T. Materna, H. Faust, C. Sage, Abdelhazize Chebboubi, Olivier Litaize, O. Méplan, Grégoire Kessedjian, M. Rapala, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Laue-Langevin (ILL), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université 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)-Université Grenoble Alpes (UGA), ILL, 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 ), and Université Grenoble Alpes (UGA)

Subjects
Physics, [PHYS]Physics [physics], Spectrometer, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, Nuclear data, 01 natural sciences, Spent nuclear fuel, Neutron temperature, Nuclear physics, Criticality, Nuclear fission, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Decay heat, 010306 general physics, Nuclear Experiment
Abstract

Nuclear fission yields are key parameters to evaluate reactor physics observables, such as fuel inventory, decay heat, spent fuel radiotoxicity, criticality but also for understanding the fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the description of the uncertainties with the associated correlations. Additional kinds of measurements provide complementary information in order to test the models used in the nuclear data evaluation. Moreover, some discrepancies between these libraries must be explained. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurement of isotopic and isobaric fission yields with the related variance-covariance matrices. Nevertheless, the experimental program represents itself a large range of observables requested by the evaluations: isotopic yields, nuclear charge polarization, odd-even effect, isomeric ratio and their dependency with fission fragment kinetic energy as a probe of the nuclear de-excitation path in the (E*, Jπ) representation. Measurements for thermal neutron induced fission of 241Pu have been carried out at the Institut Laue Langevin using the LOHENGRIN mass spectrometer. Experimental program, observables reachable, results and comparison to model calculations are shown.

Published
2019

2. Isomeric ratio measurements with the ILL LOHENGRIN spectrometer

Author

U. Köster, Olivier Litaize, Grégoire Kessedjian, A. Chebboubi, C. Sage, A. Blanc, D. Bernard, P. Mutti, H. Faust, O. Méplan, O Serot, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Laue-Langevin (ILL), and ILL

Subjects
Spectrometer, 010308 nuclear & particles physics, Fission, Chemistry, Physics, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear reactor, 01 natural sciences, 7. Clean energy, Neutron damage, law.invention, Momentum, Nuclear physics, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, Physics::Chemical Physics, Nuclear Experiment, 010306 general physics
Abstract

International audience; The modelling of γ heating and neutron damage inside a nuclear reactor is essential to design the next generation of nuclear reactors. The determination of the fission fragment momentum is a key element to perform accurate calculations of the γ heating. One way to assess this information is to look at the isomeric ratio of different nuclei. According to the lifetime of the isomeric state, different experimental techniques were developed at the LOHENGRIN spectrometer. A focus on the measurement of isomeric ratios of 136I in neutron induced fission of 241Pu is presented. A discussion with the current assumptions used in the evaluation process for isomeric ratio is also shown.

Published
2016

3. Measurement of mass yields from the 241Am(2nth,f) reaction at the Lohengrin spectrometer

Author

S. Chabod, F. Martin, Grégoire Kessedjian, Stefano Panebianco, H. Faust, Audrey Letourneau, Ulli Köster, Ch. Sage, J.-F. Lemaitre, N. Capellan, C. Amouroux, Aurelien Blanc, Adrien Bidaud, T. Materna, O Serot, A. Chebboubi, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, 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 transmutation, Spectrometer, 010308 nuclear & particles physics, Fission, Chemistry, Physics, QC1-999, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Mass spectrometry, 01 natural sciences, 7. Clean energy, Nuclear physics, Scientific method, 0103 physical sciences, Thermal, 010306 general physics, Ground state, ComputingMilieux_MISCELLANEOUS
Abstract

The study of fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. While the yields are known for the major actinides ( 235 U, 239 Pu) in the thermal neutron-induced fission, only few measurements have been performed on 242 Am. The interest of 242 Am concerns the reduction of radiotoxicity of 241 Am in nuclear wastes using transmutation reactions. This paper presents the measurement of the fission mass yields from the reaction 241 Am(2nth,f) performed at the Lohengrin mass spectrometer (ILL, France) for both the light and the heavy peaks: a total of 41 mass yields have been measured. The experiment was also meant to determine whether there is a difference in mass yields between the isomeric state and the ground state as it exists in fission and capture cross sections. The method used to address this question is based on a repeated measurement of a set of fission mass yields as a function of the ratio between the 242g Am and the 242m Am fission rates. The presented experiment is also a first step towards the measurement of the isotopic fission yields of 242 Am .

Published
2013

4. Evaluation of excitation energy and spin in fission fragments using the statistical model, and the FIPPS project

Author

H. Faust, U. Koester, Grégoire Kessedjian, C. Sage, A. Chebboubi, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, Gamma ray, Statistical model, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 021001 nanoscience & nanotechnology, 01 natural sciences, Nuclear physics, Nuclear fission, Scientific method, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 0210 nano-technology, Spin (physics), Nuclear Experiment, ComputingMilieux_MISCELLANEOUS, Energy (signal processing), Excitation
Abstract

We review the statistical model and its application for the process of nuclear fission. The expressions for excitation energy and spin distributions for the individual fission fragments are given. We will finally emphasize the importance of measuring prompt gamma decay to further test the statistical model in nuclear fission with the FIPPS project.

Published
2013

5. Pre- and post- scission particle emission in 3D Langevin calculations with various macroscopic potentials

Author

J.P. Wieleczko, A. Chbihi, A. Maj, D. Gruyer, P. N. Nadtochy, K. Mazurek, M. Kmiecik, P. Wasiak, E. Bonnet, C. Schmitt, J.D. Frankland, 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), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, and 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)

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Differential equation, Fission, Drop (liquid), QC1-999, Nuclear Theory, Charge density, Kinetic energy, 01 natural sciences, 7. Clean energy, Potential energy, Semi-empirical mass formula, 0103 physical sciences, Atomic physics, Wigner effect, 010306 general physics, Nuclear Experiment
Abstract

International audience; The fission dynamics described by solving differential equations of the Langevin type in three dimensional space of the deformation parameters is very sensitive on the choice of the macroscopic components such as potential energy models. The mass or charge distribution or total kinetic energy has been already shown to be different when one uses the Finite Range Liquid Drop Model or Lublin - Strasbourg Drop model. Also the shape-dependent congruence or shape-dependentWigner energy and A0 terms are important especially for the fission of medium mass nuclei. We would like to make step forward and answer the question about the varying of the post-scission multiplicity by including different PES. Up to now there are only few experimental data for the medium mass nuclei where the pre- and post- scission emission has been estimated and isotopic distributions have been shown. The isotopic distributions of the fission products for light compound nucleus such as 111 In with two beam energies (Ebeam = 10.6AMeV and 5.9 AMeV) and two heavy systems: 229Np with Ebeam = 7.4AMeV and 260 No (Ebeam = 6AMeV and 7.5 AMeV) have been studied theoretically. The agreement with the experimental data is discussed.

Published
2013

6. γ-ray spectroscopy of fission fragments from the cold-neutron235U induced fission with EXILL

Author

T. Konstantinopoulos, A. Astier, C. Petrache, A. Abudra, R. Bontemps, I. Deloncle, S. Kaim, R. Leguillon, M.-G. Porquet, T. Zerrouki, L. Grente, M.-D. Salsac, M. Zielinska, G. de France, Z. Janas, M. Karny, A. Korgul, M. Ramdhane, G. Gey, G. Simpson, A. Vancraeyenest, A. Blanc, M. Jentschel, U. Köster, P. Mutti, T. Soldner, W. Urban, G. Duchêne, R. Lozeva, F. Ibrahim, A. Gargano, A. Covello, D. Mengoni, C.A. Ur, M. Sferrazza, B. Melon, 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), CSNSM SNO, 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 Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique 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), Institut Laue-Langevin (ILL), 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), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, 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)-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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), ILL, and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fission products, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Neutron radiation, Nuclear reactor, 7. Clean energy, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Neutron, Nuclear Experiment, Spectroscopy, 010303 astronomy & astrophysics
Abstract

Expérience ILL/EXOGAM; International audience; A cold neutron induced fission experiment recently took place at the Institute Laue-Langevin (ILL) in Grenoble. The neutron beam was provided by the nuclear reactor facility at ILL and the detector setup that was used for the -spectroscopy of the fission products consisted mainly of the detectors of the EXOGAM array [1], thereby the name of the campaign is EXILL. The main purpose of our measurement was to investigate the nuclei in the region with N = 50 close to 78Ni as well as the nuclei close to the N = 82 shell closure. In this paper, the motivation of the experiment is described as well as the experimental setup and the status of the ongoing data analysis.

Published
2013

7. Fission of highly excited nuclei investigated in complete kinematic measurements

Author

J. Vargas, H. Alvarez-Pol, J. Benlliure, A. Prochazka, A. Kelic-Heil, C. Paradela, L. Audouin, B. Laurent, T. Gorbinet, N. Kurz, J. F. Martin, D. M. Rossi, J. L. Rodriguez-Sanchez, L. Tassan-Got, D. Cortina-Gil, Herbert A. Simon, Andreas Martin Heinz, C. Rodriguez-Tajes, Bernd Voss, B. Pietras, D. Ramos, G. Belier, J. Taieb, E. Pellereau, Yassid Ayyad, A. Chatillon, G. Boutoux, Enrique Casarejos, 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), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, and 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)

Subjects
Physics, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, Observable, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Nuclear physics, Excited state, 0103 physical sciences, Quasiparticle, Dissipative system, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

International audience; Fission is an extremely complex mechanism that requires a dynamical approach to describe the evolution of the process in terms of intrinsic and collective excitations of the nuclear constituents. In order to determine these effects a complex experimental setup was mounted at GSI, which allowed us for the first time the full identification in charge and mass of all fission fragments thanks to a magnetic separation and the use of the inverse kinematic technique. Moreover, we also measured the neutron multiplicities and the light-charged particles emitted in coincidence with fission. These complete kinematic measurements will be used to define sensitive observables to dissipative and transient effects in fission. In this manuscript we present the first results for the total fission cross sections.

Published
2013

8. Modelling with uncertainties: The role of the fission barrier

Author

Hongliang Lü, David Boilley, 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), Normandie Université (NU), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, and 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)

Subjects
Physics, Toy model, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, QC1-999, Bayesian probability, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inverse problem, 01 natural sciences, Ion, Nuclear physics, 0103 physical sciences, Statistical physics, Nuclear Experiment, 010306 general physics, Excitation, Communication channel
Abstract

International audience; Fission is the dominant decay channel of super-heavy elements formed in heavy ions collisions. The probability of synthesizing heavy or super-heavy nuclei in fusion-evaporation reactions is then very sensitive to the height of their fission barriers. This contribution will firstly address the influence of theoretical uncertainty on excitation functions. Our second aim is to investigate the inverse problem, i.e., what information about the fission barriers can be extracted from excitation functions? For this purpose, Bayesian methods have been used with a simplified toy model.

Published
2013

9. FALSTAFF: A new tool for fission studies

Author

T. Materna, Diane Doré, François-René Lecolley, G. Lehaut, F. Farget, Th. Papaevangelou, Stefano Panebianco, J. Pancin, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, 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 Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, Detector, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Neutron temperature, Characterization (materials science), Nuclear physics, 0103 physical sciences, Neutron, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Residual energy, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

International audience; The future NFS installation will produce high intensity neutron beams from hundreds of keV up to 40MeV. Taking advantage of this facility, data of particular interest for the nuclear community in view of the development of the fast reactor technology will be measured. The development of an experimental setup called FALSTAFF for a full characterization of actinide fission fragments has been undertaken. Fission fragment isotopic yields and associated neutron multiplicities will be measured as a function of the neutron energy. Based on time-of-flight and residual energy technique, the setup will allow the simultaneous measurement of the complementary fragments velocity and energy. The performances of TOF detectors of FALSTAFF will be presented and expected resolutions for fragment masses and neutron multiplicities, based on realistic simulations, will be shown.

Published
2013

10. Lifetime measurements on fission fragments in the A ∼ 100 region

Author

M. Hackstein, N. Pillet, B. Bruyneel, J. Litzinger, M. Rejmund, A. Pipidis, W. Korten, Igor T. Čeliković, F. Recchia, C. Michelagnoli, O. Delaune, Thomas Braunroth, C. Louchart, A. Dijon, A. Drouart, A. Gottardo, C. Schmitt, J. Libert, M. D. Salsac, Andreas Görgen, J. Ljungvall, Trine Wiborg Hagen, Eric Clément, J. J. Valiente-Dobón, W. Rother, K. O. Zell, D. R. Napoli, E. Sahin, L. Grente, A. Navin, Sunniva Siem, Bertrand Jacquot, S. Erturk, B. Sulignano, F. Farget, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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 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 Sciences Nucléaires et de Sciences de la Matière (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), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, 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)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Physics, Range (particle radiation), Spectrometer, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Physics and Astronomy (all), symbols.namesake, Recoil, chemistry, Excited state, 0103 physical sciences, symbols, Atomic physics, Nuclear Experiment, 010306 general physics, Doppler effect
Abstract

Expérience GANIL/VAMOS/EXOGAM; International audience; Lifetimes of first 4+ and 6+ states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and -rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1-100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region.

Published
2013

11. Investigating the dynamics of fission with low-fissility highly-excited nuclei

Author

Enrique Casarejos, C. Schmitt, M. V. Ricciardi, R. Pleskac, P. N. Nadtochy, F. Farget, S. Leray, K.-H. Schmidt, T. Kurtukian, Timo Enqvist, J. Benlliure, M. Fernandez, A. Boudard, Yassid Ayyad, Dolores Pérez, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, 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, Fissility, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, Dynamics (mechanics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Dissipative system, Deformation (engineering), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

International audience; Total fission cross sections and charge distributions of the final fission fragments have been measured at GSI in inverse kinematics for the reactions 208Pb + p,d at 500AMeV and 182Ta + p at 300, 500, 700 and 1000AMeV. These data are used to investigate dissipative and transient effects at low deformation and its possible dependences with temperature and fissility.

Published
2013

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