Mean Field Potential for Non-Equilibrium Phase Space and Its Effect on Heavy-Ion Reaction

概要

論文の詳細を見る
Mean field potentials for non-equilibrium phase space distributions are obtained from the solution of the Beth-Goldstone equation for two interpenetraring nuclear matters. They are given as a function of the total density, relative momentum and asymmetry of the two nuclear matters. The mean-field potentials become less attractive as the relative momentum increases foe finite asymmetry. For convenience in studying heavy-ion reactions in the framework of transport theories, the density dependence of the potential is parametrized in a Skyrme-type form. Coefficients are functions of the relative momentum and the asymmetry between the two nuclear matters. These parametrized potentials are implemented in quantum molecular dynamics (QMD). The total density, relative momentum and asymmetry at a local point are evaluated in the simulation and used to calculate the potential in the equation of motion. In order to study the effect of a non-equilibrium mean-field potential in the studies of heavy-ion reactions, simulations of ^<40>Ca-^<40>Ca at E_<1ab> = 200 and 400 MeV/u have been performed in QMD using both non-equilibrium and equilibrium mean-field potentials. The effect is significant even at 200 MeV and should be included in studies of heavy-ion reactions using transport theories.
理論物理学刊行会の論文
1998-06-25