Nuclear Stopping in Heavy Ion Collisions

Abstract

A semi-classical transport model, namely, Isospin quantum molecular dynamics (IQMD) model, is employed to investigate the emission of free, light charged particles and degree of equilibrium or stopping reached in heavy ion collisions. We study the dependence of nuclear stopping Qzz and R in intermediate energy heavy ion collisions on transverse momentum, rapidity, energy, N/Z and scaled impact parameter. For this study, simulations were carried out for the systems 52Cr24 + 54Ni28, 52Cr24 + 56Ni28, 52Cr24 + 58Ni28, 52Cr24 + 60Ni28, 52Cr24 + 62Ni28 at different beam energies from 50 to 200 MeV/nucleon at reduced impact parameters i.e. at = 0, 0.1, 0.2, 0.3 using soft equation of state (EOS) employed at symmetry energy E = 32 MeV/n. We find that the effect of N/Z on stopping is weak. It is shown that R and Qzz behave as a global stopping parameter. Moreover, maximum stopping is obtained for low beam energies in the presence of symmetry energy in central collisions.