相对论重离子碰撞的趋平衡问题

Equilibration in Relativistic Heavy ion Collisions

从相对论ＢＵＵ理论出发，研究了１ＧｅＶ／ｕ能区重离子碰撞全局和局域平衡性质．研究结果表明，在该能区平均场对反应动力学过程仍有相当的作用；对有限核系统的反应动力学过程的时间演化的研究表明，有限核系统未能达到全局平衡，在中心区基本达到局域平衡．因而在该能区的重离子碰撞中引入完全热平衡概念时，需谨慎考虑．

The equilibration in relativistic heavy ion collisions for systems 16 O+ 16 O, 40 Ca+ 40 La and 139 La+ 139 La is studied with RBUU theory. We have found that the mean field still plays a role in addition to the collision term in the equilibration process in relativistic heavy ion collisions at energy around 1 GeV/u. For finite systems, the systems do not reach complete equilibrium. But at the center zone, the local equilibrium is almost reached.