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The successful multi-modal random neck-rupture model of Brosa, Grossmann and Müller is composed of two parts: multi-modal fission and random neck-rupture. It has been found that several "exit channels" exist for the fissioning nucleus, with partly different fission barriers and prescission shapes. With random neck-rupture of these prescission shapes, it is now possible to compare quantitatively the theoretically computed fission fragment properties with the experimental results. This comparison has been very successful for 235U(n,f), several of the neutron-induced and spontaneously fissioning Pu-isotopes and, later, for 252Cf(SF). The results for 252Cf(SF) have been re-evaluated and are presented. However, systems with a fission threshold as a function of neutron energy have not yet been measured with enough detail to be compared with the theoretical predictions. Theoretically only the systems already mentioned (and some very heavy systems) have been calculated, which do not include systems with fission threshold. With such systems it might be possible to detect finer details of the multichannel fission and bifurcation points. The programs of Brosa are installed at CBNM for the theoretical calculation of the fission channels. The calculated pictures of the compound system 238Np are presented.

Additional information

Authors: HAMBSCH F-J, JRC Geel (BE);SIEGLER P, JRC Geel (BE)
Bibliographic Reference: Paper presented: Seminar on Fission, Pont d'Oye (BE), Oct. 23-25, 1991
Availability: Available from (1) as Paper EN 36451 ORA
Record Number: 199111524 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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