中能重离子反应中的在平面流和椭圆流  

Directed and Elliptic Flow in Heavy Ion Collisions

作　　者：张虎勇[1] 马余刚[1] 余礼平[1] 沈文庆[1] 蔡翔舟[1] 方德清[1] 胡鹏云[1] 钟晨[1] 韩定定[2] 

机构地区：[1]中国科学院上海原子核研究所,上海201800 [2]华东师范大学电子科学系,上海200062

出　　处：《高能物理与核物理》2001年第12期1184-1190,共7页High Energy Physics and Nuclear Physics

基　　金：国家杰出青年基金 ( 1 972 5 5 2 1 );国家自然科学基金 ( 1 970 5 0 1 2 );上海市科技启明星计划 ( 97QA1 4 0 38);中国科学院院长基金;国家基础研究发展规划 (G2 0 0 0 774 0 0 )资助~~

摘　　要：利用同位旋相关的量子分子动力学模型研究了40 Ca + 40 Ca系统在能量从3 0MeV/u到 1 50MeV/u的在平面流和椭圆流 .发现随着入射能量的增加 ,在平面流出现从负到正的跃迁 ,而椭圆流则随入射能量的增大而减少并且出现从正到负的跃迁 .椭圆流和在平面流对于入射能量和碰撞参数较为敏感 ,相反对于对称能和核态方程却不太敏感 .The directed and elliptic flow in collisions of 40Ca+ 40Ca at energies from 30MeV/nucleon to 150MeV/nucleon is well studied in an isospin-dependent quantum molecule dynamics model (IQMD). With increasing incident energy, the directed flow rises from the negative to the positive and the elliptic flow shows decrease with increasing incident energy. The directed flow and the elliptic flow are sensible of the impact parameter and incident energy but they are not very sensible of systematic energy. The directed flow and the elliptic flow are also not very sensible of the EOS because of the combined systematic mass. Systematic studies of the cluster mass dependence are also carefully performed and the elliptic flow of heavy cluster mass is larger than that of light cluster mass. The difference of elliptic flow between the heavy cluster mass and the light one will be not very obvious with increasing incident energy because of large number of light cluster mass.

关 键 词：同位旋 量子分子动力学模型 核态方程 在平面流 椭圆流 中能重离子反应 IQMD模型 

分 类 号：O571.6[理学—粒子物理与原子核物理] O572[理学—物理]