Impact parameter and beam energy dependence for azimuthal asymmetry of direct photons and free protons in intermediate energy heavy-ion collisions |
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作者姓名: | 刘桂华 马余刚 蔡翔舟 方德清 沈文庆 田文栋 王鲲 |
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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 |
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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) |
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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.
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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 |
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Affiliation: | Shanghai Institute of Applied Physics;Chinese Academy of Sciences;Shanghai 201800;China;Graduate University of Chinese Academy of Sciences;Beijing 100080;China |
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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... |
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Keywords: | hard photon azimuthal asymmetry BUU impact parameter dependence energy dependence |
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