Dissipation strength of the tilting degree of freedom in fusion-fission reactions

Omsk State University, Physics Department, Mira prospekt 55-A, Omsk, 644077, Russia

Published online: 11 May 2016

Abstract

The four-dimensional Langevin model was applied to calculate a wide set of experimental observables for compound nuclei, formed in heavy-ion fusion-fission reactions. A modified one-body mechanism for nuclear dissipation with a reduction coefficient k_s of the contribution from a “wall” formula was used for shapes parameters. Different possibilities of deformation-dependent dissipation coefficient for the K coordinate (γK) were investigated. Presented results demonstrate that the influence of the k_s and γK parameters on the calculated quantities can be selectively probed. It was found that it is possible to describe experimental data with the deformation-dependent γK coefficient. One of the possibility is to use large values of γK ≃ 0.2 (MeV zs)^−1/2 for compact shapes featuring no neck and small values of γK ≃ 0.0077 (MeV zs)^−1/2 for elongated shapes.