Dissipation and forces in time-dependent Hartree-Fock calculations

We have performed time-dependent Hartree-Fock calculations for the ${}_{}{}^{16}{}_{}{}^{}$O${+}^{16}$O system using various parametrizations of the Skyrme force. These calculations also include the spin-orbit part of the Skyrme force. We have refitted the finite-range version of the Skyrme force to the ground state properties of eight nuclei with improved accuracy. Particular emphasis is given to comparisons of calculations with and without the spin-orbit force. We see a strong sensitivity of the results to the different parametrizations of the effective interaction. The spin-orbit force introduces a significant enhancement of the dissipation. A schematic model of heavy-ion scattering is used to investigate the origin of the observed sensitivity. We find that the dissipation is essentially determined by the additional residual interaction.