Correlations between the fragmentation modes and light charged particles emission in heavy ion collisions

TL;DR

This study investigates how different fragmentation modes in semi-peripheral heavy ion collisions influence the rapidity distribution of light charged particles, revealing correlations that help estimate the likelihood of multi-fragmentation events.

Contribution

It introduces a method to relate rapidity distribution features to fragmentation modes, supported by simulations and comparison with experimental data.

Findings

Binary and ternary modes favor mid-rapidity emission

Multi-fragmentation mode accounts for over 40% of events

Rapidity distributions can estimate multi-fragmentation probability

Abstract

The correlations between the shape of rapidity distribution of the yield of light charged particles and the fragmentation modes in semi-peripheral collisions for $^{70}$Zn+$^{70}$Zn, $^{64}$Zn+$^{64}$Zn and $^{64}$Ni+$^{64}$Ni at the beam energy of 35MeV/nucleon are investigated based on ImQMD05 code. Our studies show there is an interplay between the binary, ternary and multi-fragmentation break-up modes. The binary and ternary break-up modes more prefer to emit light charged particles at middle rapidity and give larger values of $R_{yield}^{mid}$ compared with the multi-fragmentation break-up mode does. The reduced rapidity distribution for the normalized yields of p, d, t, $^3$He, $^4$He and $^6$He and the corresponding values of $R_{yield}^{mid}$ can be used to estimate the probability of multi-fragmentation break-up modes. By comparing to experimental data, our results illustrate that $\ge$40\% of the collisions events belong to the multi-fragmentation break-up mode for the reactions we studied.