Energy and pairing dependence of dissipation in real-time fission dynamics

This work presents a microscopic study of dissipation in fission dynamical evolutions with the time-dependent Hartree-Fock + BCS method in terms of energy dependence and pairing dependence. The friction coefficients and dissipation energies are extracted by mapping the symmetric fission process of Fm-258 into a classical equation of motion. Density-constrained calculations are used to obtain the dynamical potential. The obtained friction coefficients have a strong dependence of deformations, and averagely match the coefficients adopted in statistical models. The dissipation indeed increase with increasing initial excitation energies or with decreasing pairing strengths. It is also shown that dissipations play a significant role in the final stage of scission. The demonstrated characteristics of dissipations will be valuable for calibrations of various fission models.

Automated summary

This work presents a microscopic study of dissipation in fission dynamical evolutions with the time-dependent Hartree-Fock + BCS method, extracting friction coefficients and dissipation energies. It is shown that dissipation increases with increasing initial excitation energies or decreasing pairing strengths, playing a significant role in the final stage of scission. The characteristics of dissipations demonstrated in this study will be valuable for calibrations of various fission models.