动量相关势对直接流和椭圆流的影响  

The Influence of the Momentum Dependence Potential on the Directed Flow and Elliptic Flow

作　　者：刘洋阳 王永佳[2] 崔莹 李祝霞[3] 陈永静[1] 李庆峰[2,4] 张英逊[3,5] Yangyang;WANG Yongjia;CUI Ying;LI Zhuxia;CHEN Yongjing;LI Qingfeng;ZHANG Yingxun(China Nuclear Data Center,China Institute of Atomic Energy,Beijing 102413,China;School of Science,Huzhou University,Huzhou 313000,Zhejiang,China;Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Guangxi Key Laboratory of Nuclear Physics and Technology,Guangxi Normal University,Guilin 541004,Guamgxi,China)

机构地区：[1]中国原子能科学研究院中国核数据中心,北京104203 [2]湖州师范学院理学院,浙江湖州313000 [3]中国原子能科学研究院核物理研究所,北京104203 [4]中国科学院近代物理研究所,兰州730000 [5]广西师范大学广西核物理与核技术重点实验室,广西桂林541004

出　　处：《原子核物理评论》2022年第1期16-22,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11875323,11790325,11875125,11947410,11705163,11790320,11790323,11961141003);国家重点研发计划项目(2018 YFA0404404);稳定基础研究项目(WDJC-2019-13);中国原子能科学研究院基金资助项目;浙江省“万人计划”项目。

摘　　要：利用极端相对论量子分子动力学(UrQMD)模型,研究了两种不同强度的动量相关势对中子、质子、氢同位素和带电荷粒子等四种粒子直接流和椭圆流的影响。计算结果表明,在不可压缩系数K_(0)一定的情况下,直接流几乎不敏感于动量相关势的变化,而高动量粒子的椭圆流v2则敏感于高动量处动量相关势强度的大小及其动量依赖。考虑高动能区强度较强的Hama动量相关势后,上述四种粒子椭圆流的幅度均会增强。与ASY-EOS实验室提供的中子和带电荷粒子椭圆流数据比较后发现,较强动量相关势可以较好地再现实验数据。The effect of the two forms of momentum-dependence potential on the directed flow and elliptic flow of neutron,proton,hydrogen isotopes,and charged particles are explored with the ultrarelativistic quantum molecular dynamics(UrQMD)model.The results show that the directed flow is almost insensitive to the momentum-dependence potential for the given incompressibility K_(0).But the elliptic flow of the above four particle species are sensitive to the strength and momentum dependence of the momentum-dependence potential,especially at high transverse momentum.The stronger momentum-dependence potential leads to a stronger elliptic flow.By comparing with the ASY-EOS experimental data,the calculation with a stronger momentum-dependence potential is favored.

关 键 词：动量相关势 直接流 椭圆流 

分 类 号：O571.53[理学—粒子物理与原子核物理]