Effect of Fock terms on nuclear symmetry energy based on Lorentz-covariant decomposition of nucleon self-energies
Effect of Fock terms on nuclear symmetry energy based on Lorentz-covariant decomposition of nucleon self-energies
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DOI：
10.1088/1742-6596/1643/1/012015
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
T. Miyatsu;M. Cheoun;C. Ishizuka;Kyungsik Kim;T. Maruyama;Koichi Saito
中科院分区：
文献类型：
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作者：
T. Miyatsu;M. Cheoun;C. Ishizuka;Kyungsik Kim;T. Maruyama;Koichi Saito
利用相对论平均场近似下核子自能的Lorentz协变分解，研究了Fock项对核对称能E sym密度依赖性的影响。结果表明，在较高密度下，Fock贡献抑制了E sym的势部分，而重离子碰撞数据的约束条件有利于包含交换项的本结果，其截止参数由CD Bonn势给出.此外，通过交换图，不仅等矢-矢量（ρ）介子，而且等势介子（σ，ω）和π介子也对E sym的势部分产生影响。
Using the Lorentz-covariant decomposition of nucleon self-energies with relativistic mean-field approximation, we study the effect of Fock terms on the density dependence of nuclear symmetry energy, E sym. It is found that the Fock contribution suppresses the potential part of E sym at higher densities, and the constraint from the heavy-ion collision data is in favor of the present result including exchange terms with the cutoff parameters given by the CD-Bonn potential. In addition, not only the isovector-vector (ρ) meson but also the isoscalar (σ, ω) and π mesons give influence on the potential part of E sym through the exchange diagram.