Role of two-body dissipation on the mean-field dynamics validity

TL;DR

This paper investigates how two-body dissipation influences the validity of mean-field models in nuclear deep-inelastic reactions, revealing its increasing significance at higher energies and specific impact parameters.

Contribution

It introduces a systematic analysis using the TDHF-QRx approach to assess two-body dissipation effects on mean-field dynamics in nuclear reactions.

Findings

Contact time increases with two-body dissipation.

Reaction properties like scattering angles are affected.

Significance of dissipation grows with energy and decreasing impact parameter.

Abstract

The role of two-body dissipation in nuclear reactions at energies of several times Coulomb barrier remains unclear but is crucial for understanding the mechanisms of deep-inelastic reactions. In this letter, we report a systematic analysis of two-body dissipation effects on the validity of mean-field dynamics, enabled by the TDHF-QRx approach, which incorporates the collision term via the relaxation-time approximation rather than full collision calculations. For deep-inelastic reactions, the contact time between nuclei is found to increase, resulting in changes to the reaction process and fragment properties such as scattering angles and total kinetic energy. These changes become important with the increase of reaction energy and decrease of impact parameter. We identify the range of reaction condition where two-body dissipation becomes significant, providing valuable insights for the applicability of mean-field dynamics approaches. The limitations of model, particularly those arising from the incomplete conservation of the locality of two-body dissipation within the quantum framework, are also discussed.