Journal
NUCLEAR PHYSICS A
Volume 760, Issue 1-2, Pages 19-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2005.06.003
Keywords
NUCLEAR REACTIONS Th-232, U-238(n, f), E=10-100 MeV; measured fission fragments angular distributions, anisotropy; Th-232, U-238(n, f), E; 80 MeV; Th-232, U-238(n, 2n), (n, 3n), (n, xnf), E; 20 MeV; calculed sigma, fission fragments angular anisotropy; multichance fission, saddle-point statistical model analysis
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Fission fragment angular distributions have been measured for the Th-232(n, f) and U-238(n, f) reactions in the neutron energy range 20-100 MeV. The fragment angular anisotropy for Th-232 was found to be systematically larger than that for U-238. The obtained results have been analyzed in the framework of the statistical saddle-point model combined with pre-equilibrium and Hauser-Feshbach calculations of partial fission cross sections. The calculations have revealed that fission following multiple neutron emission takes place in both reactions, resulting in a considerable contribution of high chances to the total fission fragment angular anisotropy. This gives grounds to expect that the observed difference is mainly due to nuclei fissioning at the end of the neutron evaporation chain. (c) 2005 Elsevier B.V. All rights reserved.
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