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

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 Rn-210 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, gamma(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 Rn-210. 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 gamma(k) = (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 Rn-210 is small.