相对论重离子碰撞的温度涨落与热容

Temperature Fluctuation and Heat Capacity in Relativistic Heavy-Ion Collisions

使用LUCIAE3 0模型模拟了SPS能区Pb +Pb和C +C在不同能量 (Elab=2 0— 2 0 0AGeV)和不同中心度下的重离子碰撞 .并通过逐个事件的粒子温度涨落提取出了相应粒子的热容 ,发现对于同一碰撞系统 ,单位发射粒子的热容随碰撞能量的升高而下降直至饱和 ,随着碰撞参数b的增大而减小 ,而且发现单位发射粒子的热容具有随粒子质量的变大而变大的关系 .同时还发现不同碰撞系统中同一种粒子具有相同的单位发射粒子热容 ,并给出了相应的解释 .

We used LUCIAE3.0 model to simulate the Pb+Pb and C+C in SPS energy. The heat capacity was then extracted from event by event temperature fluctuation. It is found that the heat capacity per hadron multiplicity decreases with the increasing of beam energy and impact parameter for a given reaction system. While the hadron mass increases, the heat capacity per hadron multiplicity rises. In addition, we found that, for a given hadron, the heat capacity per hadron multiplicity is almost the same regardless the reaction system. Some discussions were also given.