反对称分子动力学模型中的冻结概念(英文)  

Freeze-out Concept in Antisymmetrized Molecular Dynamics

作　　者：林炜平 刘星泉[1,2] 黄美容[1] 张苏雅拉吐 陈志强[1] 王建松[1] 韩瑞[1,2] 刘建立[1] 任培培[1,2] 石福栋 WADA Roy 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049

出　　处：《原子核物理评论》2015年第2期170-174,共5页Nuclear Physics Review

基　　金：National Natural Science Foundation of China(11075189 and 11105187);Hundred Talents Program of Chinese Academy of Sciences(0910020BR0,Y010110BR0);Strategic Priority Research Program of Chinese Academy of Sciences(XDA03030200);Program of“Visiting Professorship of Senior International Scientists”of Chinese Academy of Sciences(2012T1JY3-2010T2J22)~~

摘　　要：给出了反对称分子动力学模型(AMD)计算的50 Me V/nucleon112Sn+112Sn反应的分析结果。该研究是反对称分子动力学模型中统计冻结概念的部分研究结果。利用自洽法结合修正的Fisher模型,提取了发射源的温度和密度分别为T=(6.1±0.2)Me V,ρ/ρ0=0.69±0.03。通过与AMD模型计算的系统在时间演化过程中的最大密度比较,得出碎片发射源的密度远小于系统的最大密度。利用自洽法提取的温度和密度与35 Me V/nucleon的40Ca+40Ca反应系统及40 Me V/nucleon的64Zn+112Sn反应系统所提取的温度和密度非常接近。该结果表明反对称分子动力学模型中,系统在中等质量碎片形成时刻处于统计冻结体积。As a part of statistical freeze-out study in antisymmetrized molecular dynamics(AMD), an analysis of112Sn+112Sn at 50 Me V/nucleon is presented. Using the self-consistent method combined with the Modified Fisher model, the fragmenting source density, ρ/ρ0 = 0.69±0.03, temperature, T =(6.1±0.2)Me V, are extracted. By comparing the maximum density in the system during the time evolution of AMD calculation, a significantly lower density is found for the fragmenting source density. The extracted fragmenting source density and temperature are very similar to those for40 Ca +40Ca at 35 Me V/nucleon and64 Zn +112Sn at 40 Me V/nucleon. These indicate that there is a common statistical freeze-out volume at the time of the formation of intermediate mass fragments(IMFs) in AMD transport model.

关 键 词：统计冻结 反对称分子动力学 重离子核反应 自洽法 密度 温度 

分 类 号：O571.6[理学—粒子物理与原子核物理]