核破裂中的激发能的作用  

Role of Excitation Energy in Nuclear Dissociation'

作　　者：马余刚[1] 苏前敏[1] 沈文庆[1] 王建松[1] 方德清[1] 蔡翔舟[1] 张虎勇[1] 

机构地区：[1]中国科学院上海原子核研究所

出　　处：《高能物理与核物理》2000年第6期528-534,共7页High Energy Physics and Nuclear Physics

基　　金：国家杰出青年基金!(19725521);国家自然科学基金!(19705012);上海市科技启明星计划!(97QA14038);中国科学院院长基金特别支持

摘　　要：在晶格气体模型的框架中研究了12 9Xe系统在破裂过程中的热力学性质和轻粒子发射性质随核温度和系统的冻结密度的变化规律 .计算发现在不同的冻结密度下 ,12 9Xe破裂过程的物理观测量呈现了不同的温度相关性 .在这种情况下 ,核物质液气相变发生时的临界温度强烈地依赖于系统的冻结密度 .当激发能代替温度作为一个自变量时 ,临界激发能将不再灵敏地依赖于系统的冻结密度 .除此之外 ,由于不同冻结密度而引起的不同粒子发射产额的温度相关性 ,也随着激发能的应用 ,出现了几乎一致的激发能依赖性 .从这些结果中可以认为 。The features of thermodynamics and particle emission during the disassembly of 129 Xe are investigated as functions of temperature and freeze-out density in the framework of the lattice gas model. The calculation shows different temperature dependence of physical observables at different freeze-out density. In this case, the critical temperature at the phase transition depends strongly on the freeze-out density. However, a unique critical excitation energy is revealed in different freeze-out densities when the excitation energy is used as a variable instead of temperature. Moreover, the different behavior of particle emission with temperature stemming from different ρ f vanishes when excitation energy replaces temperature. It indicates that the excitation energy can be seen as a basic and scalable quantity to control nuclear disassembly.

关 键 词：晶格气体模型 核温度 激发能 临界现象 核破裂 

分 类 号：O571.4[理学—粒子物理与原子核物理]