Isospin diffusion in semi-peripheral $^{58}Ni$ + $^{197}Au$ collisions at intermediate energies (II): Dynamical simulations

TL;DR

This paper investigates isospin diffusion in semi-peripheral Ni+Au collisions at intermediate energies using dynamical simulations, comparing different symmetry energy parameterizations to experimental data.

Contribution

It introduces a microscopic transport model with varied symmetry energy terms to analyze isospin effects and compares simulation results with experimental data for better understanding.

Findings

Linear density-dependent symmetry energy aligns better with experimental data.

Simulations reveal the degree of isospin equilibration in Ni+Au collisions.

The model effectively reproduces observed isospin diffusion phenomena.

Abstract

We study isospin effects in semi-peripheral collisions above the Fermi energy by considering the symmetric $^{58}Ni$ + $^{58}Ni$ and the asymmetric reactions $^{58}Ni$ + $^{197}Au$ over the incident energy range 52-74 A MeV. A microscopic transport model with two different parameterizations of the symmetry energy term is used to investigate the isotopic content of pre-equilibrium emission and the N/Z diffusion process. Simulations are also compared to experimental data obtained with the INDRA array and bring information on the degree of isospin equilibration observed in Ni + Au collisions. A better overall agreement between data and simulations is obtained when using a symmetry term which linearly increases with nuclear density.