Problems of fission induced by neutrons

The review of studies realized by the present time on the investigation of the process of Np, Pu, U heavy nuclei isotope fission in (n, f) reactions is given. In the course of studying heavy nuclei fission with neutron reactions the most probable decay process is considered to be: radiation transition neutron emission, fission into two excited fragments. The problem of statistical transition throUgh the fission barrier to the saddle point and the compound-states decay of nuclei based on the liquid drop model and Strutinsky shell corrections is investigated. Introduction of corrections has lead to two-humped type of fission barrier. Intermediate structures in the neutron heavy nuclei fission cross section are considered. Two sets of auxiliary states corresponding to various forms of nuclei deformation (1 class-wave functions pertain to the 1st well, 2 class-to the 2nd one) are determined. Fission widths (FW) and FW distribution depending on state energy for 1 and 2 classes are calculated. The partial FW and 1 and 2 class state level width effect on the behaviour of nuclei finite states is studied. The problem of vibrational states damping and thorium anomaly in sOp(230,232)Th (n, f) reactions are discussed in detail