# Continuum damping effects in nuclear collisions associated with twisted boundary conditions

## TL;DR

This study uses time-dependent Skyrme Hartree-Fock calculations with twisted boundary conditions to investigate continuum damping effects and rotational damping in nuclear collisions, revealing persistent damping phenomena and angular momentum retention in the evolved compound nucleus.

## Contribution

It introduces the implementation of twisted boundary conditions in TDHF calculations to effectively study continuum damping effects in nuclear collisions.

## Key findings

- Continuum damping effects persist after fusion.
- Rotational damping widths are clearly extractable.
- The compound nucleus evolves towards sphericity while retaining angular momentum.

## Abstract

The time-dependent Skyrme Hartree-Fock calculations have been performed to study $^{24}$Mg +$^{24}$Mg collisions. The twisted boundary conditions, which can avoid finite box-size effects of the employed 3D coordinate space, have been implemented. The prolate deformed $^{24}$Mg has been set to different orientations to study vibrations and rotations of the compound nucleus $^{48}$Cr. Our time evolution results show continuum damping effects associated with the twist-averaged boundary condition play a persistent role after the fusion stage. In particular, a rotational damping in continuum is presented in calculations of both twist-averaged and absorbing boundary conditions, in which damping widths can be clearly extracted. It is unusual that the rotating compound nucleus in continuum evolves towards spherical but still has a considerable angular momentum.