中高能重离子碰撞过程中集体流的能量和碰撞参数相关性

Impact Parameter and Bombarding Energy Dependence of Collective Flow in the Dynamics Process of Intermediate High Energy Heavy Ion Collision

在BUU方程中引入真实的与动量和密度相关的平均场及介质中与密度和能量相关的核子-核子碰撞截面。在各种入射能量和碰撞参数下,对于反应Ca^(40)+Ca^(40)求解BUU方程。系统地计算和分析了集体流随时间变化的过程,结果表明:动量相关势和介质效应对集体流都有明显的影响,而且这种影响都有明显的能量和碰撞参数相关性。

The time processes of collective flow were calculated by use of BUU equation with momentum dependence mean field and nucleon-nucleon collisions in medium. It is shown that the momentum dependence mean field effect and the medium effect on the collective flow are obvious and sensitive to impact parameter and bombarding energy.