中低能核反应中的混沌与多重碎裂的非线性动力学机制  

Chaos in Heavy-Ion Collisions at Intermediate Energy and Nonlinear Dynamics of Multifragmentation

作　　者：邢永忠[1] 方玉田[1] 

机构地区：[1]天水师范学院基础物理研究所,甘肃 天水

出　　处：《现代物理》2020年第2期7-15,共9页Modern Physics

基　　金：本文由国家自然科学基金项目(No. 11665019)资助。

摘　　要：本文对低能核反应和中重离子碰撞中的多重碎裂现象与混沌动力学之间的联系进行了简要的综述。主要定性地介绍和总结了目前人们在对原子核反应的研究过程中所揭示出的非线性动力学特征。文中首先简介了复合核反应模型与随机矩阵理论预言的一致性。随后回顾了受激核物质系统的不稳定性、相变等与非线性动力学密切相关的基本特征。最后介绍了近年来人们以分子动力学方法为基础,所揭示出的受激核物质的不稳定性与低密核物质的奇异结构。In this paper, the relationship between the multifragmentation and chaotic dynamics in low en-ergy nuclear reactions and heavy ion collisions at intermediate energy is briefly reviewed. After recalling some concepts about the compound nuclear reaction model and the random matrix theory, we introduce the properties of excited nuclear matter in the spatial-temporal evolution process, such as spinodal instability, phase transition, which are closely related to the nonlinear dynamics. Some important nonlinear dynamical characteristics in these processes are summa-rized qualitatively. Moreover, the strange structure of the excited nuclear matter at the sub-densities has also been surveyed briefly.

关 键 词：中低能 核反应 多重碎裂 非线性动力学 混沌 

分 类 号：O57[理学—粒子物理与原子核物理]