The two-body dissipation effects in heavy-ions collisions solved by the quantum relaxation-time approximation

Accurately describing the quantum many-body dynamics during nuclear reactions is a key challenge in nuclear physics research.While mean-field methods can effectively describe the dynamics of low-energy nuclear reactions, their applicability in higher energy regimes is limited due to the neglect of two-body collision correlations.In this study, based on the time-dependent Hartree-Fock (TDHF) method, the quantum relaxation-time approximation (QRTA) is introduced to account for the dissipation effects from the two-body collision in nuclear reactions, resulting in the new version of TDHF-QRx method.The central collisions of ^16rmO+^16rmOat various reaction energies are calculated.The direct manifestation of two-body dissipation is the enhancement of momentum equilibrium and the conversion of collective kinetic energy into excitation energy, when the reaction system possesses sufficient excitation energy and imbalance.A quantitative evaluation of the energy dependence of two-body dissipation is performed, allowing for determining the energy range where the mean-field approximation is reasonably applicable.We show that QRTA effectively compensates for the two-body dissipation mechanism missing in the mean-field approach, providing a valuable guidance for the development of microscopic nuclear reaction dynamics theory.