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The fission fragment properties of the reaction 237Np(n, f) have been investigated at IRMM in the neutron energy range En-0.3 to 5.5 MeV. Above En=0.5 MeV, TKE averaged over all fission fragment masses shows a continuously decreasing trend. The observed variations in the TKE as a function of the compound nuclear excitation energy have been attributed to a combination of the changes in the mass yield and TKS distributions.

A description of the two-dimensional mass-TKE distributions has been obtained in terms of fission modes in the frame of the multi-modal random neck-rupture model. The inclusion of the super-long symmetric mode is necessary to explain the observed dip in the experimental TKE close to symmetry. .

Additional information

Authors: HAMBSCH F J, IRMM, JRC-Geel (BE);VIVES F, ILL, Grenoble (FR);SIEGLER P, ILL, Grenoble (FR);OBERSTEDT S,
Bibliographic Reference: Article: Nuclear Physics A (1999)
Record Number: 200011820 / Last updated on: 2000-02-25
Original language: en
Available languages: en
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