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Light nuclei production in Au + Au collisions at sNN = 7.7 - 80 GeV from UrQMD model
Physics Letters B ( IF 4.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.physletb.2020.135668
Xian-Gai Deng , Yu-Gang Ma

Abstract Light nuclei production in relativistic 197Au + 197Au collisions from 7.7 to 80 GeV is investigated within the Ultra-relativistic-Quantum-Molecular-Dynamics model (UrQMD) with a naive coalescence approach. The results of the production of light nuclei at midrapidity can essentially match up the experimental data and a slight enhancement of combined ratio of N p N t / N d 2 where N p , N d and N t represent respectively the yields of proton, deuteron and triton, which is sensitive to the neutron density fluctuations, occurs around 20 GeV. However, this enhanced N p N t / N d 2 ratio should not be over-understood considering that the present UrQMD model is a cascade version without equation of state (EoS), i.e. there is an absence of critical end point mechanism. Furthermore, within different rapidity regions, the kinetic temperatures of different light nuclei are extracted by the Blast-wave model analysis and ratios among different light nuclei are also discussed.

中文翻译:

来自 UrQMD 模型的 sNN = 7.7 - 80 GeV 处 Au + Au 碰撞中的轻核产生

摘要 在超相对论-量子-分子-动力学模型 (UrQMD) 中,使用朴素的聚结方法研究了从 7.7 到 80 GeV 的相对论 197Au + 197Au 碰撞中的轻核产生。中速轻核的产生结果与实验数据基本吻合,N p N t / N d 2 的组合比略有提高,其中N p 、N d 和N t 分别代表质子、氘核的产率对中子密度波动敏感的氚原子出现在 20 GeV 左右。然而,考虑到目前的 UrQMD 模型是没有状态方程 (EoS) 的级联版本,即没有关键终点机制,不应过度理解这种增强的 N p N t / N d 2 比率。此外,在不同的速度区域内,
更新日期:2020-09-01
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