arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1002.4905nucl-th
收藏

0.09 A GeV ~ 160 A GeV能区重离子碰撞中核阻止的输运模型研究

Transport model study of nuclear stopping in heavy ion collisions over an energy range from 0.09A GeV to 160A GeV

Ying Yuan, Qingfeng Li, Zhuxia Li, Fu-Hu Liu

摘要:

在修正的UrQMD输运模型框架下,考虑了已形成和“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,研究了从SIS、AGS到SPS束流能量范围内重离子碰撞中的核阻止.结果表明,核阻止不仅受物态方程刚度的影响,而且受SIS能区核子-核子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双凸结构,这可以通过考虑“预形成”强子势来理解。

英文摘要:

Nuclear stopping in the heavy ion collisions over a beam energy range from SIS, AGS up to SPS is studied in the framework of the modified UrQMD transport model, in which mean field potentials of both formed and "pre-formed" hadrons (from string fragmentation) and medium modified nucleon-nucleon elastic cross sections are considered. It is found that the nuclear stopping is influenced by both the stiffness of the equation of state and the medium modifications of nucleon-nucleon cross sections at SIS energies. At the high SPS energies, the two-bump structure is shown in the experimental rapidity distribution of free protons, which can be understood with the consideration of the "pre-formed" hadron potentials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑