Symmetry energy dependence of light fragment production in heavy-ion collisions

H H Wolter,P Decowski,M Zielinska-Pfabe,M Colonna

doi:10.1051/epjconf/20158800021

Abstract

We study the pre-equilibrium light cluster emission in low to intermediate energy heavy ion collisions in transport simulations as a means to obtain information about the density and momentum dependence of the nuclear symmetry potential, i.e. about the asy-stiffness and the neutron-proton effective mass splitting of the symmetry energy. We find that the study of n/p and t/He-3 ratios as a function of the energy of the emitted particles may allow to disentangle these two behaviors The t/He-3 ratios appear to carry similar information as the n/p ratios, making this a promising option for experimental investigations. More n-rich systems enhance the sensitivity to the symmetry energy, while double ratios between n-rich and n-poor systems tend to reduce it. A preliminary comparison to experimental data for the Xe-136, Xe-124 + (124, 112) Sn systems is also shown.

Highlights

EPJ Web of Conferences nuclear matter and study the explicitly the momentum dependence of the potentials
The most direct effect of the symmetry energy is expected to be seen in the neutron to proton ratios
For a n-rich medium the neutron potential is repulsive below saturation, and the repulsion is stronger for an asy-soft symmetry energy

Summary

Introduction

EPJ Web of Conferences nuclear matter and study the explicitly the momentum dependence of the potentials. In this contribution we consider nuclear matter around and below saturation densities in collision with energies from the Fermi energy to a few 100 MeV per particle, where the decomposition into fragments with the emission of light clusters is the main decay mode, which allows to obtain information on the properties of the nuclear symmetry energy.

Results

Conclusion