中能重离子碰撞中的自旋效应

原子核物理评论 , 2014, (3): 306-314. doi: 10.11804/NuclPhysRev.31.03.306

中能重离子碰撞中的自旋效应

1.中国科学院上海应用物理研究所，上海 201800; 德州农工大学考莫斯分校物理与天文系，考莫斯，德州 75429-3011，美国

2.德州农工大学考莫斯分校物理与天文系，考莫斯，德州 75429-3011，美国; 西安交通大学应用物理系，西安 710049

3.中国科学院上海应用物理研究所,上海,201800

4.中国科学院上海应用物理研究所,上海,201800

基金项目: Hundred Talents Program of Chinese Academy of Sciences(Y290061011) CUSTIPEN (China-U.S. Theory Institute for Physics with Exotic Nuclei) Foundation from DOE(DE-FG02-13ER42025)@@@@基金项目:中国科学院百人计划项目(Y290061011)；美国自然科学基金(PHY-0757839和PHY-1068022) US National Science Foun-dation(PHY-0757839, PHY-1068022) National Aeronautics and Space Administration issued through Science Mission Directorate(NNX11AC41G) 美国科学任务理事会资助的国家航空与空间管理基金(NNX11AC41G)；美国能源部资助的中美合作奇异核物理科研基金(DE-FG02-13ER42025)

关键词： IBUU输运模型 , 自旋轨道相互作用 , 重离子碰撞

Spin Effects in Intermediate-energy Heavy-ion Collisions

Keywords： IBUU transport model , spin-orbit interaction , heavy-ion collision

详细介绍并深化了在IBUU输运模型中引入核子的自旋轨道相互作用及其自旋自由度来研究重离子反应的工作。虽然自旋相关的平均场势中时间反演对称项与时间反演不对称项的贡献相反，但依然观察到体系存在局域自旋极化。发现最终的结果由时间反演不对称项决定，可以利用重离子碰撞中自旋向上核子与自旋向下核子的横向差分流来研究介质中自旋轨道相互作用的性质，包括其强度、密度依赖性和同位旋依赖性，而且即使在小体系下该差分流依然不失为自旋轨道相互作用的良好探针。

In this paper, we report and extend our recent work where the nucleon spin-orbit interac-tion and its spin degree of freedom were introduced explicitly for the first time in the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model for heavy-ion reactions. Despite of the significant can-cellation of the time-even and time-odd spin-related mean-field potentials from the spin-orbit interaction, an appreciable local spin polarization is observed in heavy-ion collisions at intermediate energies be-cause of the dominating role of the time-odd terms. It is also found that the spin up-down differential transverse flow in heavy-ion collisions is a useful probe of the strength, density dependence, and isospin dependence of the in-medium spin-orbit interaction, and its magnitude is still considerable even at smaller systems.

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