超相对论Au+Au碰撞中椭圆流的时间依赖(英文)  

Time Dependence of Elliptic Flow in Ultrarelativistic Au+Au Collisions

作　　者：冯启春[1] 张景波[1] 霍雷[1] 张卫宁[1] 

机构地区：[1]哈尔滨工业大学物理系,哈尔滨150001

出　　处：《高能物理与核物理》2007年第8期736-740,共5页High Energy Physics and Nuclear Physics

基　　金：黑龙江省自然科学基金(A0208);哈尔滨工业大学校基金(HIT.2002.47,HIT.2003.33)资助~~

摘　　要：用相对论量子分子动力学(RQMD)模型模拟了质心系束能量为S_(NN)^(1/2)=200GeV的Au+Au非对心碰撞,研究了椭圆流对末态粒子冻出时间的关系.研究了在不同的阶段,椭圆流对末态粒子位置的关系.结果表明椭圆流随冻出时间的单调递减,椭圆流对横向半径的关系随冻出时间发生变化.用压力梯度对所得结果进行了分析.径向速度用来表征压力梯度.The freeze-out time dependence of the elliptic flow and the transverse radius ΥΤ dependence of elliptic flow at different freeze-out time are studied for non-central Au＋Au collisions at √SNN=200 GeV with the Relativistic Quantum Mocular Dynamics model.We get the results that the elliptic flow decreases with the freeze-out time and the correlation between the elliptic flow and the transverse radius changes with the freeze-out time what could be explained with the pressure gradient.The transverse expansion velocity of particles emitted at the freeze-out time is adopted as a signal of the pressure gradient.

关 键 词：相对论重离子碰撞 椭圆流 横向速度 压力梯度 冻出时间 

分 类 号：O572.21[理学—粒子物理与原子核物理]