Influence of Skyrme-type interaction on HICs observables

Yingxun Zhang,Hang Liu,M.B Tsang,Zhuxia Li

doi:10.1051/epjconf/201611707025

Abstract

A new version of the improved quantum molecular dynamics model has been developed by including Skyrme type momentum dependent interaction. 12 Skyrme like parameter sets {K0, S0, L, m ∗, m ∗} are adopted in the transport model code to calculate the isospin diffusion, single and double ratios of transverse emitted nucleons, neutron proton isoscaling ratios. The calculations and correlation analysis evidence that isospin diffusion observable at lower beam energy is sensitive to the slope of symmetry energy and m ∗. The high energy neutrons and protons yield ratios from reactions at different incident energies provide a sensitive observable to study the nucleon effective mass splitting, at higher beam energy. The properties of isospin asymmetric nuclear equation of state is of fundamental importance in our understanding of nature’s asymmetric objects including neutron stars as well as heavy nuclei with very different number of neutrons and protons. Currently, there exist, lot of effective interaction parameter sets [1, 2], for fitting the ground-state properties of stable nuclei, symmetric and asymmetric nuclear matter. It also leads very different neutron Equation of state which may have different nuclear matter (NM) parameters, such as incompressibility K0, isoscalar effective mass m ∗ ,s ymmetry energy coef fi cientS0, slope of symmetry energy L and isovector effec

Highlights

Some properties of symmetric nuclear matter, such as K0 = 230±30MeV [1,5,6] and m∗s/m = 0.65 − 0.99 [1,5,7,8], have been extracted from isoscalar collective vibrations, giant quadrupole resonance and heavy ion collisions measurements
The properties of isospin asymmetric nuclear equation of state is of fundamental importance in our understanding of nature’s asymmetric objects including neutron stars as well as heavy nuclei with very different number of neutrons and protons
A consistent set of constraints on the symmetry energy near saturation density, i.e. S0 ∼ 31M eV ± ΔS0 and its slope L ∼ 50 − 60M eV ± ΔL, has been obtained from observables measured in both nuclear structure and nuclear reaction experiments [9,10,11,12]

Summary

Introduction

It leads very different neutron Equation of state which may have different nuclear matter (NM) parameters, such as incompressibility K0, isoscalar effective mass m∗s, symmetry energy coefficient S0, slope of symmetry energy L and isovector effective mass m∗v [3,4], or different sign or magnitude of effective mass splitting. A consistent set of constraints on the symmetry energy near saturation density, i.e. S0 ∼ 31M eV ± ΔS0 and its slope L ∼ 50 − 60M eV ± ΔL, has been obtained from observables measured in both nuclear structure and nuclear reaction experiments [9,10,11,12].

Results

Conclusion