近期孙保元教授与龙文辉教授课题组基于核力介质效应对热核物质液气相变相关研究取得进展。工作基于PKA1有效相互作用，计算了热核物质液气相变的临界参数以及热核物质液气相变相图。与传统的20组有效相互作用相比，由于PKA1有效相互作用中额外考虑了ρ介子张量。这种张量成分会有效的改变核力吸引排斥平衡机制，进而影响到热核物质液气相变。我们的工作揭示了核力介质效应对热核物质液气相变的重要影响，并为未来热核物质液气相变临界温度等模型相关研究提供了相应参考。

文章发表在：Physical Review C 103, 014304 (2021)

文章标题：Liquid-gas phase transition of thermal nuclear matter and the in-medium balance between nuclear attraction and repulsion

文章链接：https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.014304

摘要: Properties of the liquid-gas (LG) phase transition of thermal nuclear matter are investigated within the relativistic Hartree-Fock (RHF) theory, focusing on the role played by the in-medium balance between nuclear attraction and repulsion. Applying the RHF Lagrangian PKA1, rather different critical properties and LG phase diagrams are obtained in contrast to the other popular relativistic Lagrangians. Aiming at such notable model deviations, a series of testing parametrizations xκρ (κρ being the ρ-tensor coupling strength) are proposed to bridge PKA1 and other popular Lagrangians. Along the systematics from PKA1 to the xκρ series and further to other popular Lagrangians, it is illustrated that the in-medium balance of nuclear attraction and repulsion,

manifested as various modeling of the nuclear in-medium effects, is essential for the van der Waals-like behaviors of thermal nuclear matter, in which the residual nuclear in-medium effects deduced from the dominant attractive and repulsive channels play a significant role. Our study paves a way to model the in-medium nuclear interactions from the thermal statistic aspects of nuclear systems, e.g., referring to the critical temperature from future delicate experiments.