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用统计模型方法计算重离子碰撞可从实验测量到的粒子产额及产额比中直接获取系统温度、体积、粒子密度和能量密度等热力学量,获得系统热力学性质及有关系统是否达到平衡或达到平衡程度的信息。通常的统计模型建立在系统只有1个火球的基础上,认为两个核碰撞时形成1个温度、粒子密度、能量密度等完全均一的火球;火球内除含有碰撞核子(参加者)外,还包括大量的次级
Calculating the heavy ion collisions using the statistical model method, the thermodynamic quantities such as the system temperature, the volume, the particle density and the energy density can be directly obtained from the experimentally measured particle yield and the yield ratio to obtain the thermodynamic properties of the system and whether the relevant system has reached the equilibrium or reached Balance information. The usual statistical model is based on the fact that there is only one fireball in the system. It is believed that two fireballs form a completely uniform fireball at the time of collisions, such as temperature, particle density and energy density. In addition to colliding nucleons (participants) Including a large number of secondary