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Uranium symmetric/asymmetric neutron-induced fission up to 200 MeV

  • V. M. MaslovEmail author
Article

Abstract.

The symmetric SL-mode and asymmetric lumped (S1 + S2)-mode fission cross-sections of 235U(n,F) and 233U(n,F) reactions are calculated up to \(E_{\rm {n}} = 200\) MeV within a statistical model. For each U nuclide, emerging in \((\rm {n},x\rm {nf})\) 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 for the 238U(n,F) reaction, more fissions coming from neutron-deficient nuclei were assumed. The damping of the triaxial collective modes contribution to the level density at the SL-mode outer saddle was essential for the branching ratio description. These assumptions allow to reproduce observed fission cross-sections of 235U(n,F) and 233U(n,F) reactions. The calculated branching ratio sensitivity to the target nuclide fissility is investigated.

Keywords

Uranium Statistical Model Level Density Collective Mode Mode Contribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.Joint Institute for Nuclear and Energy Research, “Sosny”MinskBelarus

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