Isospin diffusion in semi-peripheral $^{58}Ni$ + $^{197}Au$ collisions at intermediate energies (I): Experimental results

TL;DR

This study investigates how isospin diffuses during semi-peripheral nuclear collisions at intermediate energies, revealing that target isospin influences neutron richness and that diffusion increases with collision centrality.

Contribution

It provides experimental evidence of isospin diffusion dependence on collision centrality and target isospin in $^{58}Ni$ + $^{197}Au$ collisions at intermediate energies.

Findings

Isospin diffusion increases with collision centrality.

Target isospin affects neutron richness of light products.

Diffusion correlates with interaction time.

Abstract

Isospin diffusion in semi-peripheral collisions 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. A close examination of the multiplicities of light products in the forward part of phase space clearly shows an influence of the isospin of the target on the neutron richness of these products. A progressive isospin diffusion is observed when collisions become more central, in connection with the interaction time.