Shear viscosity to entropy density ratio in BUU transport model  

作　　者：LI Shaoxin FANG Deqing MA Yugang ZHOU Chenglong 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [2]Graduate School of Chinese Academy of Sciences, Beijing 100080, China

出　　处：《Nuclear Science and Techniques》2011年第4期235-239,共5页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China (No.11035009,10979074,10775168 and 10975174);Major State Basic Research Development Program in China (No.2007CB815004);Foundation for Developing Science and Technology in Shanghai (No. 09JC1416800);Knowledge Innovation Project of Chinese Academy ofSciences under (No. KJCX2-EW-N01)

摘　　要：Shear viscosity (η) is a basic transport coefficient of the medium.In this work,we calculate shear viscosity to entropy density ratio (η/S) of an equilibrated system in intermediate energy heavy ion collisions within the framework of the Boltzmann-Uehling-Uhlenbeck model (BUU) model.After the equilibration of Au + Au system at central collision in a fixed volume is reached,temperature,pressure and energy density are extracted by the phase space information and then η/S is calculated using the Green-Kubo formulas.The results show that η/S drops with the incident energy and its value is not so drastically different from the RHIC results.Shear viscosity （η） is a basic transport coefficient of the medium. In this work, we calculate shear viscosity to entropy density ratio （η/S） of an equilibrated system in intermediate energy heavy ion collisions within the framework of the Boltzmann-Uehling-Uhlenbeck model （BUU） model. After the equilibration of Au ＋ Au system at central collision in a fixed volume is reached, temperature, pressure and energy density are extracted by the phase space information and then η/S is calculated using the Green-Kubo formulas. The results show that η/S drops with the incident energy and its value is not so drastically different from the RHIC results.

关 键 词：剪切粘度 运输模型 密度比 BOLTZMANN 中能重离子碰撞 平衡系统 熵 运输系数 

分 类 号：O571.6[理学—粒子物理与原子核物理] TS274[理学—物理]