Manifestation Of Average Gamma-Ray Multiplicity In The Fission Modes Of Cf-252(Sf) And The Proton - Induced Fission Of Pa-233, Np-239 And Am-243

Average preequilibrium < M-n(preeq)>, average statistical prescission < M-n(stpre)> and postscission < M-n(post)> neutron multiplicities as well as average gamma-ray multiplicity < M-gamma >, average energy < E-gamma > emitted by gamma-rays and average energy per one gamma quantum as a function of mass and total kinetic energy < TKE > of fission fragments were measured in the proton induced reactions p+Th-232 -> Pa-233, p+U-238 -> Np-239 and p+Pu-242 -> Am-243 (at proton energy E-p=13, 20, 40 and 55 MeV) and spontaneous fission of Cf-252. The fragment mass and energy distributions (MEDs) have been analyzed in terms of the multimodal fission. The decomposition of the experimental MEDs onto the MEDs of the distinct modes has been fulfilled in the framework of a method that is free from any parameterization of the distinct fission mode mass distribution shapes [1]. The main characteristics of symmetric and asymmetric modes have been studied in their dependence on the compound nucleus composition and proton energy. The manifestation of multimodal fission in average gamma-ray multiplicity < M-gamma > of fission fragments was studied in this work.