Probing the symmetry energy with isospin ratio from nucleons to fragments

TL;DR

This paper investigates how isospin-sensitive observables in nuclear reactions can reveal the density dependence of symmetry energy, using the ImQMD05 model to analyze various reaction systems and compare with experimental data.

Contribution

It introduces a comprehensive analysis of isospin observables' sensitivity to symmetry energy and cluster formation, providing insights into nuclear reaction mechanisms.

Findings

Observables are sensitive to the density dependence of symmetry energy.

Cluster formation mechanisms influence isospin observable measurements.

Comparison with data constrains symmetry energy parameters.

Abstract

Within the framework of ImQMD05, we study several isospin sensitive observables, such as DR(n/p) ratios, isospin transport ratio (isospin diffusion), yield ratios for LCPs between the projectile region and mid-rapidity region for the reaction systems Ni+Ni, Zn+Zn, Sn+Sn at low-intermediate energies. Our results show that those observables are sensitive to the density dependence of symmetry energy, and also depend on the cluster formation mechanism. By comparing these calculations to the data, the information of the symmetry energy and reaction mechanism is obtained.