Influence of angular momentum of compound nucleus on the variances of the fission fragment mass distributions

The variances of the mass distribution of fission fragments for rotating compound nuclei were calculated by describing the dynamics of fission in the diffusion model based on the Fokker-Planck equation for the distribution function of collective-variables. The calculated variances of the mass distribution as functions of the angular momentum are considerably increasing for nuclei with Z2/A > 33. The increasing of variances with angular momentum is caused by the shift of the saddle points in the region of deformations where the values of the mass asymmetric stiffness coefficients are smaller and by the ''memory'' of fissioning system of its history during descent from the saddle point to scission. The calculated and averaged over the realized in reaction the distribution of angular mometum variances are compared with the experimental data