Isospin Diffusion in $^{58}$Ni-Induced Reactions at Intermediate Energies

TL;DR

This study investigates isospin diffusion in nickel-induced nuclear reactions at intermediate energies, comparing experimental data with transport model simulations to understand the role of symmetry energy and estimate equilibration times.

Contribution

It provides new insights into the density dependence of the symmetry energy term in nuclear reactions through experimental and theoretical analysis.

Findings

Better agreement with data when symmetry potential increases linearly with density

Isospin equilibration time estimated at 130±10 fm/c at 52 MeV/A

Experimental data supports a specific form of symmetry energy density dependence

Abstract

Isospin diffusion is probed as a function of the dissipated energy by studying two systems $^{58}$Ni+$^{58}$Ni and $^{58}$Ni+$^{197}$Au, over the incident energy range 52-74\AM. Experimental data are compared with the results of a microscopic transport model with two different parameterizations of the symmetry energy term. A better overall agreement between data and simulations is obtained when using a symmetry term with a potential part linearly increasing with nuclear density. The isospin equilibration time at 52 \AM{} is estimated to 130$\pm$10 fm/$c$.