πN势对π介子直接流的影响  

Effects of the Pion-nucleon Potential on the Directed Flow of Pion

作　　者：刘洋阳 刘玲[1] 李庆峰[2,3] 王永佳[2] LIU Yangyang;LIU Ling;LI Qingfeng;WANG Yongjia(Physical Science and Technical CoIIege,Shenyang Normal University,Shenyang l1003d,China;School of Science,Huzhou University,Htlzhotl 313000,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]沈阳师范大学物理科学与技术学院,辽宁沈阳110034 [2]湖州师范学院理学院,浙江湖州313000 [3]中国科学院近代物理研究所,甘肃兰州730000

出　　处：《湖州师范学院学报》2018年第4期20-23,共4页Journal of Huzhou University

基　　金：国家自然科学基金项目(11505057;11375062;11747312);浙江省自然科学基金项目(LY18A050002)

摘　　要：在优化后的极端相对论量子分子动力学模型(UrQMD模型)基础上加入两种不同强度的πN势,研究它们对π介子的直接流及粒子数的影响.通过理论计算结果与FOPI实验数据进行比较发现,考虑较弱的πN势可以很好地解释直接流随快度的变化情况,而考虑较强的πN势或不考虑πN势给出的结果均与实验数据有较大差异.Within the newly updated version of the ultrarelativistic quantum molecular dynamics（UrQMD）model,the directed flow and the transverse velocity distribution of pions are studied by employing two different pion-nucleon potentials.By comparing the simulated results with the FOPI experimental data,it is found that the directed flow of pion can be reproduced well by calculations with a relatively weak pion-nucleon potential.

关 键 词：重离子碰撞 UrQMD模型 πN势 直接流 

分 类 号：O571[理学—粒子物理与原子核物理]