标题： 核物质状态方程和重离子碰撞中碎片形成的统一描述 显示英文标题

标题： A unified description for nuclear equation of state and fragmentation in heavy ion collisions

摘要： 我们提出一个模型，提供核物态方程和碎片化的统一描述。 物态方程在Bragg-Williams以及Bethe-Peierls近似下进行评估，并与使用Skyrme相互作用的平均场理论中的结果进行比较。 该模型表现出液气类型的相变。 在有限温度下，研究了不同密度下的核碎片分布。 在临界点观察到碎片的幂律行为。 对碎片分布和二阶矩$S_2$的研究显示，热力学临界点与临界密度下的渗流点重合。 该模型的高温行为表现出化学平衡的特征。 显示英文摘要

摘要： We propose a model that provides a unified description of nuclear equation of state and fragmentations. The equation of state is evaluated in Bragg-Williams as well as in Bethe-Peierls approximations and compared with that in the mean field theory with Skyrme interactions. The model shows a liquid-gas type phase transition. The nuclear fragment distributions are studied for different densities at finite temperatures. Power law behavior for fragments is observed at critical point. The study of fragment distribution and the second moment $S_2$ shows that the thermal critical point coincides with the percolation point at the critical density. High temperature behavior of the model shows characteristics of chemical equilibrium.