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在ＢＵＵ框架下，讨论了中能重离子碰撞过程中的平衡过程，以及相关的物理量，如集体流、温度、化学势．研究发现，一定时间以后达到局域平衡，且中心区域最先达到平衡，同时周边碰撞时也发现存在局域平衡．平衡时温度为５一７ＭｅＶ．
Under the framework of BUU, the equilibrium process and the related physical quantities such as collective flow, temperature and chemical potential are discussed. The study found that after a certain period of time to achieve the balance of the local area, and the center area to achieve the first balance, while the surrounding collision also found that there is a local balance. The equilibrium temperature is 5 a 7MeV.