Dynamical and statistical description of multifragmentation in heavy-ion collisions

TL;DR

This paper combines dynamical and statistical models to analyze multifragmentation in heavy-ion collisions, demonstrating improved accuracy in reproducing fragment charge distributions at intermediate energies.

Contribution

It introduces a hybrid modeling approach using ImQMD and GEMINI to better describe multifragmentation phenomena in heavy-ion collisions.

Findings

ImQMD accurately describes charge distributions in central collisions.

Statistical model improves description in peripheral collisions.

Hybrid model reproduces experimental charge distributions well.

Abstract

To explore the roles of dynamical model and statistical model in the description of multifragmentation in heavy-ion collisions at intermediate energies, the fragments charge distributions of $^{197}$Au+$^{197}$Au at 35 MeV/u are analyzed by using the hybrid model of improved quantum molecular dynamics (ImQMD) model plus the statistical model GEMINI. We find that, the ImQMD model can well describe the charge distributions of fragments produced in central and semi-central collisions. But for the peripheral collisions of Au+Au at 35 MeV/u, the statistical model is required at the end of the ImQMD simulations for the better description of the charge distribution of fragments. By using the hybrid model of ImQMD+GEMINI, the fragment charge distribution of Au+Au at 35 MeV/u can be reproduced reasonably well. The time evolution of the excitation energies of primary fragments is simultaneously investigated.