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Temperature-dependent fission barriers and fission-fragment mass distributions are calculated in the framework of the multi-modal random-neck rupture model. A study is made of the contributions to the fission process of the three dominant fission modes at low excitation energies : superlong (symmetric), standard I, and standard II (both asymmetric). It is shown how the distinction between these fission modes disappears at higher excitation energies, due to the melting of the shell effects. Results are presented for 239 U and compared to experimental data.

Additional information

Authors: HAMBSCH F J, IRMM,JRC-Geel(BE);DUIJVESTIJN M C, Nuclear Research and Consultancy Group (NL)
Bibliographic Reference: Paper presented: International Conference on Fission and Neutron-rich Nuclei, St-Andrews (GB), 28th June-2nd July (1999)
Availability: Available from Publications and Public Relations Unit, Ispra (IT)
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