Production of neutron-rich isotopes in fission of uranium induced by neutrons of 20 MeV average energy |
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Authors: | G Lhersonneau P Dendooven G Canchel J Huikari P Jardin A Jokinen V Kolhinen C Lau L Lebreton AC Mueller A Nieminen S Nummela H Penttilä K Peräjärvi Z Radivojevic V Rubchenya M-G Saint-Laurent WH Trzaska D Vakhtin J Vervier ACC Villari JC Wang J Äystö |
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Institution: | Department of Physics, University of Jyv?skyl?, POB 35, 40351-Jyv?skyl?, Finland, FI GANIL, BP 5027, F-14076 Caen, France, FR Institut de Physique Nucléaire, F-91406 Orsay, France, FR Centre de Recherches du Cyclotron, 2 chemin du cyclotron, B-1348-Louvain-La-Neuve, Belgium, BE Khlopin Radium Institute, St. Peterburg, Russia, RU
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Abstract: | In the context of a parameter study conducted by several laboratories for future European radioactive beam facilities based
on fast-neutron induced fission, in particular for the SPIRAL-II project at GANIL, we have measured the yields of neutron-rich
isotopes in the mass range of 88 to 144. These nuclei were obtained as fission products of natural uranium bombarded by neutrons
of 20 MeV average energy emitted by a thick carbon target irradiated by 50 MeV deuterons. Yields have been measured using
on-line mass separation with the ion-guide method. Compared with proton-induced fission at 25 MeV the magnitude of cross-sections,
except for the symmetric region, is similar. Z-distributions of isobars have the same width, 0.7 charge units, but their maxima are shifted by about 0.8 charge units, favouring
production of the neutron-richer isobars. Our data allow calculations of absolute cross-sections for fission of natural uranium
induced by neutrons of about 20 MeV.
Received: 10 July 2000 / Accepted: 27 October 2000 |
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Keywords: | PACS 24 75 +i General properties of fission – 25 85 Ec Neutron-induced fisssion – 25 85 Ge Charged-particle induced fission |
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