Transport model study of nuclear stopping in heavy-ion collisions over the energy range from 0.09A to 160A GeV
Transport model study of nuclear stopping in heavy-ion collisions over the energy range from 0.09A to 160A GeV
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DOI：
10.1103/physrevc.81.034913
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发表时间：
2010-02
影响因子：
3.1
通讯作者：
Ying Yuan;Qingfeng Li;Zhu-xia Li;Fu-Hu Liu
中科院分区：
文献类型：
--
作者：
Ying Yuan;Qingfeng Li;Zhu-xia Li;Fu-Hu Liu
在修正的超相对论量子分子动力学输运模型的框架下，研究了从SIS和AGS到SPS束流能量范围内重离子碰撞中的核阻止，模型中考虑了形成和“预形成”强子（来自弦碎裂）的平均场势以及中等修正的核子-核子弹性截面.结果表明，核阻止不仅受状态方程刚度的影响，而且受SIS能区核子-核子碰撞截面的介质修正的影响。在高SPS能量下，自由质子的实验快度分布呈现出双凸结构，这可以通过考虑强子势来理解。
Nuclear stopping in heavy-ion collisions over a beam energy range from SIS and AGS up to SPS is studied in the framework of the modified Ultrarelativistic Quantum Molecular Dynamics transport model, in which mean field potentials of both formed and "preformed" hadrons (from string fragmentation) and medium-modified nucleon-nucleon elastic cross sections are considered. It is found that nuclear stopping is influenced by both the stiffness of the equation of state and medium modifications of nucleon-nucleon cross sections at SIS energies. At high SPS energies, a two-bump structure is shown in the experimental rapidity distribution of free protons, which can be understood by considering the preformed hadron potentials.