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中能重离子碰撞中的自旋效应(英文) 被引量:2

Spin Effects in Intermediate-energy Heavy-ion Collisions
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摘要 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 interaction 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 cancellation 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 because 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.
出处 《原子核物理评论》 CSCD 北大核心 2014年第3期306-314,共9页 Nuclear Physics Review
基金 Hundred Talents Program of Chinese Academy of Sciences(Y290061011) US National Science Foundation(PHY-0757839,PHY-1068022) National Aeronautics and Space Administration issued through Science Mission Directorate(NNX11AC41G) CUSTIPEN(China-U.S.Theory Institute for Physics with Exotic Nuclei)Foundation from DOE(DE-FG02-13ER42025)~~
关键词 IBUU输运模型 自旋轨道相互作用 重离子碰撞 IBUU transport model spin-orbit interaction heavy-ion collision
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参考文献4

  • 1Jun Xu,Bao-An Li.Probing in-medium spin–orbit interaction with intermediate-energy heavy-ion collisions[J].Physics Letters B (-).2013(4-5)
  • 2Bao-An Li,Lie-Wen Chen,Che Ming Ko.Recent progress and new challenges in isospin physics with heavy-ion reactions[J].Physics Reports.2008(4)
  • 3G.A. Lalazissis,D. Vretenar,W. P?schl,P. Ring.Reduction of the spin-orbit potential in light drip-line nuclei[J].Physics Letters B.1998(1)
  • 4B. Chen,J. Dobaczewski,K.-L. Kratz,K. Langanke,B. Pfeiffer,F.-K. Thielemann,P. Vogel.Influence of shell-quenching far from stability on the astrophysical r-process[J].Physics Letters B.1995(1)

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