预碎片的衰变对中能区重离子碰撞过程中集体流和核阻止本领的影响  

Effects of Sequential Decay on Collective Flows and Nuclear Stopping Power in Heavy-ion Collisions at Intermediate Energies

作　　者：肖逵 李鹏程 王永佳[1] 李庆峰[1,3] XIAO Kui;LI Pengcheng;WANG Yongjia;LI Qingfeng(School of Science,Huzhou University,Huzhou 313000,Zhejiang,China;School of Physics and Laboratory of Zhongyuan Light,Zhengzhou University,Zhengzhou 450001,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]湖州师范学院理学院,浙江湖州313000 [2]郑州大学物理学院中原之光实验室,郑州450001 [3]中国科学院近代物理研究所,兰州730000

出　　处：《原子核物理评论》2024年第1期536-544,共9页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(12335008,U2032145);国家重点研发计划资助项目(2020YFE0202002)。

摘　　要：重离子碰撞过程中轻粒子的产生对于提取核物质状态方程的信息有着重要的作用。基于极端相对论量子分子动力学(UrQMD)模型,利用统计衰变模型GEMINI++处理预激发碎片的衰变,研究了预碎片的衰变对中能区Au+Au碰撞过程中轻粒子的集体流和核阻止本领的影响。研究发现,由于记忆效应,重离子碰撞过程中的预碎片的衰变产生的子核继承了母核的部分动力学性质,在考虑预碎片的衰变后可以更好地描述实验数据,并且这种效应对观测量的影响随碰撞能量的升高而减弱。结果表明,重离子碰撞过程中预碎片的衰变以及轻粒子的产生对敏感于核物质状态方程的观测量有着一定的影响。在利用这些观测量提取核物质状态方程的信息时应当仔细处理。In heavy ion collisions(HICs),the production of light particles plays an important role in extracting information about the equation of state(EoS)of nuclear matter.Based on the Ultra-relativistic Quantum Molecular Dynamics(UrQMD)model,the effect of the sequential decay on the collective flows and the nuclear stopping power of light particles in Au+Au collisions at intermediate energies were investigated,with the statistical decay model GEMINI++is used to process the secondary decay of the primary fragments.It is found that due to the memory effect and the daughter nuclei produced by decay inherent part of the dynamic information of the parent nucleus,the experimental data can be better described by considering the sequential decay.And the influence of the sequential decay on the observables weakens with the increase of the collision energy.The results highlight that the sequential decay and the production of light particles in HICs have an obvious effect on the observables sensitive to the EoS,and these effects should be considered when adopting these observables to extract the information of the EoS.

关 键 词：重离子碰撞 统计衰变 集体流 核阻止本领 

分 类 号：O571.53[理学—粒子物理与原子核物理]