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Impact parameter and beam energy dependence for azimuthal asymmetry of direct photons and free protons in intermediate energy heavy-ion collisions
作者姓名:刘桂华  马余刚  蔡翔舟  方德清  沈文庆  田文栋  王鲲
作者单位:1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2 Graduate University of Chinese Academy of Sciences, Beijing 100080, China
基金项目:Supported by National Basic Research Program of China (973 Program) (2007CB815004);;Shanghai Development Foundation from Science and Technology (06JC14082, 06QA14062);;National Natural Science Foundation of China (10535010, 10775167)
摘    要:Hard photon emitted from energetic heavy ion collisions is of very interesting since it does not experience the late-stage nuclear interaction, therefore it is useful to explore the early-stage information of matter phase. In this work, we have calculated the impact parameter and beam energy dependence for azimuthal asymmetry, characterized by directed transverse flow parameter F and elliptic asymmetry coefficient v2, of direct photons and the corresponding free protons in intermediate energy heavy-ion collisions. It is further shown the anti-correlated azimuthal asymmetry between direct photons and free protons.

关 键 词:hard  photon    azimuthal  asymmetry    BUU    impact  parameter  dependence    energy  dependence
收稿时间:2008-10-22

Impact parameter and beam energy dependence for azimuthal asymmetry of direct photons and free protons in intermediate energy heavy-ion collisions
Affiliation:Shanghai Institute of Applied Physics;Chinese Academy of Sciences;Shanghai 201800;China;Graduate University of Chinese Academy of Sciences;Beijing 100080;China
Abstract:Hard photon emitted from energetic heavy ion collisions is of very interesting since it does not experience the late-stage nuclear interaction, therefore it is useful to explore the early-stage information of matter phase. In this work, we have calculated the impact parameter and beam energy dependence for azimuthal asymmetry, characterized by directed transverse flow parameter F and elliptic asymmetry coeffcient v2, of direct photons and the corresponding free protons in intermediate energy heavy-ion colli...
Keywords:hard photon  azimuthal asymmetry  BUU  impact parameter dependence  energy dependence  
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