Fission characteristics of the excited compound nucleus ~(210)Rn in the framework of the four-dimensional dynamical model

摘要

The evaporation residue cross section, the anisotropy of the fission fragments angular distribution, the fission probability, the mass-energy distribution of the fission fragments, and the average prescission neutron multiplicity have been calculated for the compound nucleus ~(210)Rn by using four-dimensional Langevin equations with dissipation generated through the chaos-weighted wall and window friction formula. Three collective shape coordinates plus the projection of the total spin of the compound nucleus to the symmetry axis K were considered in the four-dimensional dynamical model. In the dynamical calculations dissipation coefficient of K, γ_k was considered as a free parameter, and its magnitude was inferred by fitting measured data on the evaporation residue cross section and the anisotropy of the fission fragments angular distribution for the compound nucleus ~(210)Rn. It was shown that the results of the calculations are in good agreement with the experimental data by using values of the dissipation coefficient of K, equal to γk= (0.185-0.200) (MeV zs)~(-1/2). It also was shown that the influence of the dissipation coefficient of K on the results of the calculations of the fission probability, the mass-energy distribution of the fission fragments, and the average prescission neutron multiplicity for the compound nucleus ~(210)Rn is small.