Isospin Distillation with Radial Flow: a Test of the Nuclear Symmetry Energy

TL;DR

This paper investigates how isospin transport and radial flow in neutron-rich nuclear collisions can reveal details about the nuclear symmetry energy at low densities, using a stochastic transport model.

Contribution

It presents a fully consistent study of isospin distillation and expansion dynamics in two-component systems, linking fragment N/Z ratios with kinetic energy to probe the symmetry energy.

Findings

Identifies an EOS-dependent relation between fragment N/Z and kinetic energy.

Provides a method to access low-density symmetry energy information.

Enhances understanding of isospin transport mechanisms in nuclear collisions.

Abstract

We discuss mechanisms related to isospin transport in central collisions between neutron-rich systems at Fermi energies. A fully consistent study of the isospin distillation and expansion dynamics in two-component systems is presented in the framework of a stochastic transport theory. We analyze correlations between fragment observables, focusing on the study of the average N/Z of fragments, as a function of their kinetic energy. We identify an EOS-dependent relation between these observables, allowing to better characterize the fragmentation path and to access new information on the low density behavior of the symmetry energy.