Study of some characteristics of the thermal-neutron-induced sub-barrier fission of 231Pa, 232Th and 237Np |
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Authors: | C Wagemans M Asghar P Dhondt AJ Deruytter A Emsallem |
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Institution: | Nuclear Physics Laboratory, INW, B-9000 Gent and SCK/CEN, B-2400 Mol, Belgium;Institut Laue-Langevin, 156X Centre de Tri, 38042 Grenoble, France;Nuclear Physics Laboratory, INW, B-9000 Gent, Belgium;Institut de Physique Nucléaire, 69621 Villeurbanne, Lyon, France |
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Abstract: | Some characteristics of the thermal-neutron-induced fission of 231Pa, 232Th and 237Np were studied using a highly pure thermal-neutron beam of the Grenoble High Flux Reactor. For the thermal-neutron-induced-fission cross section we obtained 20 ± 4 mb for 237Np, 19 ± 4 mb for 231Pa and less than 2.5 μb for 232Th, in agreement with calculations based on a double humped fission barrier. We also determined a mean total fission fragment kinetic energy of 172.8 + 2.5 MeV for 237Np, which fits into the semi-empirical systematic of versus . Finally, we determined LRA/B ratios of (1.94±0.17) × 10?3 for 237Np and (1.67±0.11) × 10?3for 231Pa, in disagreement with the theoretical predictions of Feather, but consistent with the semi-empirical systematic of Halpern. |
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Keywords: | Nuclear reactions |
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