探究重离子碰撞中密度和动量依赖的单核子势的影响  

Probing the Effects of Density-and Momentum-dependent Potentials in Heavy Ion Collisions

作　　者：舒建波 左维[1,2] SHU Jianbo;ZUO Wei(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学核科学与技术学院,北京100049

出　　处：《原子核物理评论》2022年第4期446-453,共8页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11975282)。

摘　　要：从Skyrme有效核子-核子相互作用出发,得到了单核子平均场、介质中的核子-核子散射截面以及核子的初始化密度分布,自洽地用于Boltzmann-Uehling-Uhlenbeck(BUU)输运模型中。使用对应不同软硬程度对称能、相反中子-质子有效质量劈裂的六组Skyrme参数(SkI2,Gs,KDE0v1,NRAPR,BSk9和SV-mas08),利用BUU输运模型对^(124)Sn+^(124)Sn和^(112)Sn+^(112)Sn进行了碰撞模拟。结果表明,由中子-质子有效质量劈裂效应引起的自由双中质比差异在较高的核子动能下明显。此外,与NSCL实验数据的比较表明,在用到的六种相互作用之中,KDE0v1相互作用所对应的双中质比结果似乎与实验更为符合。The single-nucleon mean-field potential,in-medium nucleon–nucleon cross-sections,and initial density distributions of nucleons are obtained from the Skyrme nucleon-nucleon effective interaction,which are self-consistently used in the Boltzmann-Uehling-Uhlenbeck(BUU)transport model.The^(124)Sn+^(124)Sn and^(112)Sn+^(112)Sn reactions are simulated with BUU model using six sets of Skyrme parameters(SkI2,Gs,KDE0v1,NRAPR,BSk9,and SV-mas08)that predict different stiffnesses of the symmetry energy for two opposite choices of neutron-proton effective mass splitting.It is found that the effects of the neutron-proton effective mass splitting on double neutronproton ratios are obvious at higher kinetic energies.In addition,among the six sets of interactions,the comparison with NSCL experimental data indicates that double neutron-proton ratios corresponding to the KDE0v1 interaction seem closer to the experimental data.

关 键 词：重离子碰撞 Skyrme相互作用 对称能 有效质量劈裂 

分 类 号：O571.6[理学—粒子物理与原子核物理]