Dissipation dynamics and spin-orbit force in time-dependent Hartree-Fock theory

TL;DR

This paper uses three-dimensional time-dependent Hartree-Fock theory to study energy dissipation and the impact of spin-orbit force in heavy-ion collisions, revealing how these factors vary with collision energy.

Contribution

It provides a detailed analysis of dissipation dynamics and the role of spin-orbit force in heavy-ion collisions without symmetry restrictions, using modern Skyrme functionals.

Findings

Energy dissipation decreases with increasing bombarding energy in deep-inelastic collisions.

Spin-orbit force significantly enhances dissipation, contributing 40-65% of total dissipation.

Theoretical fusion cross sections agree well with experimental data without parameter fitting.

Abstract

We investigate the one-body dissipation dynamics in heavy-ion collisions of $^{16}{\rm O}$+$^{16}{\rm O}$ using a fully three-dimensional time-dependent Hartree-Fock (TDHF) theory with the modern Skyrme energy functional and without any symmetry restrictions. The energy dissipation is revealed to decrease in deep-inelastic collisions of the light systems as the bombarding energy increases owing to the competition between collective motion and single-particle degrees of freedom. The role of spin-orbit force is given particular emphasis in deep-inelastic collisions. The spin-orbit force causes a significant enhancement of the dissipation. The time-even coupling of spin-orbit force plays a dominant role at low energies, while the influence of time-odd terms is notable at high energies. About 40-65\% of the total dissipation depending on the different parameter sets is predicted to arise from the spin-orbit force. The theoretical fusion cross section has a reasonably good agreement with the experimental data, considering that no free parameters are adjusted to reaction dynamics in the TDHF approach.