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arXiv 1407.4644nucl-thhep-ph
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相对论性重离子碰撞中旁观者和参与者划分的时间依赖性

Time dependence of partition into spectators and participants in relativistic heavy-ion collisions

V. Vovchenko, D. Anchishkin, L. P. Csernai

摘要:

在基于相对论Boltzmann输运方程的简化Glauber模型框架下,研究了重离子碰撞中参与系统的形成过程.关键点在于核子系统依时间分为两类:在给定时间之前不参与任何相互作用的核子和已经发生相互作用的核子。在所提出的模型的框架中,我们引入了一个自然的能量依赖的时间尺度$t_c$,这使我们能够删除所有的依赖关系的碰撞能量的模型,除了核子-核子截面的能量依赖。通过研究参与者总数的时间依赖性,我们得出结论,参与者系统的形成过程在$t\simeq1.5 t_c$时完成。参与者的总角动量和涡度的时间依赖性也被认为是用来描述旋转的出现在反应平面。

英文摘要:

The process of formation of the participant system in heavy-ion collisions is investigated in the framework of a simplified analytic Glauber-like model, which is based on the relativistic Boltzmann transport equation. The key point lies in the time-dependent partition of the nucleon system into two groups: nucleons, which did not take part in any interaction before a given time and nucleons, which already have interacted. In the framework of the proposed model we introduce a natural energy-dependent temporal scale $t_c$, which allows us to remove all dependencies of the model on the collision energy except for the energy dependence of the nucleon-nucleon cross-section. By investigating the time dependence of the total number of participants we conclude that the formation process of the participant system becomes complete at $t\simeq1.5 t_c$. Time dependencies of participant total angular momentum and vorticity are also considered and used to describe the emergence of rotation in the reaction plane.

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。

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