Actinide symmetric/asymmetric nucleon-induced fission up to 200 MeV

The fission cross sections of the symmetric SL-mode and the asymmetric lumped (S1+S2)-mode of the 235U(n,F), 237Np(n,F) and 238U(p,F) reactions are calculated up to En=200 MeV within a statistical model. For each fissioning nuclide, emerging in (n,xnf) reactions, a separate triaxial outer fission ba...

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Published inPhysics letters. B Vol. 581; no. 1-2; pp. 56 - 61
Main Author Maslov, V.M
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 12.02.2004
Elsevier Science
Subjects
Exact sciences and technology
General properties of fission
Nuclear physics
Nuclear reactions: general
Physics
Damping
Branching ratio
Actinides
Statistical models
Cross sections
Fission
Nuclear reactions
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Summary:The fission cross sections of the symmetric SL-mode and the asymmetric lumped (S1+S2)-mode of the 235U(n,F), 237Np(n,F) and 238U(p,F) reactions are calculated up to En=200 MeV within a statistical model. For each fissioning nuclide, emerging in (n,xnf) reactions, a separate triaxial outer fission barrier is assumed for the SL-mode. To reproduce the measured branching ratio of symmetric and asymmetric fission events, strong contribution of fission from neutron-deficient nuclei is assumed. Damping of the contribution of triaxial collective modes to the level density at the SL-mode outer saddle seems to be essential for the description of the branching ratio. The sensitivity of the calculated branching ratio to the fissility of the target nuclide and the incident particle is investigated.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2003.11.062