arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.01103nucl-th
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重离子碰撞中介质内核子-核子相互作用的密度相关方案效应

Effects of density-dependent scenarios of in-medium nucleon-nucleon interactions in heavy-ion collisions

Gao-Feng Wei, Chang Xu, Wei Xie, Qi-Jun Zhi, Shi-Guo Chen, Zheng-Wen Long

摘要:

用一个更合理的密度依赖方案代替总密度依赖方案,研究了400 MeV/核子中心$nn$ Au+ $np$ Au碰撞中,两种密度依赖方案中介质中核子-核子相互作用的差异对同位旋敏感观测值的影响.此外,为了从物理上更好地考察两种密度依赖情形下核子-核子相互作用的差异,我们还通过拟合对称核物质的相同约束条件和饱和密度下核对称能的相同斜率参数,将单独密度依赖情形下的核子-核子相互作用映射到总密度依赖情形下的核子-核子相互作用.结果表明,两种密度依赖的情形虽然可以导致对称核物质的相同状态方程和同位旋非对称核物质的相同对称能,但也会导致本质上不同的对称势,特别是在高密度时.因此,这些同位旋敏感的观测值也明显地受到介质中核子-核子相互作用的不同密度依赖方案的影响。因此,在利用这些同位旋敏感观测值研究重离子碰撞中的高密度对称能时,应考虑介质中核子-核子相互作用的密度依赖效应.

英文摘要:

Using a more reasonable separate density-dependent scenario instead of the total density-dependent scenario for in-medium $nn$, $pp$ and $np$ interactions, we examine effects of differences of in-medium nucleon-nucleon interactions in two density-dependent scenarios on isospin-sensitive observables in central $^{197}$Au+$^{197}$Au collisions at 400 MeV/nucleon. Moreover, to more physically detect the differences between the nucleon-nucleon interactions in two density-dependent scenarios, we also map the nucleon-nucleon interaction in the separate density-dependent scenario into that in the total density-dependent scenario through fitting the identical constraints for symmetric nuclear matter as well as the identical slope parameter of nuclear symmetry energy at the saturation density. It is shown that two density-dependent scenarios also lead to essentially different symmetry potentials especially at high densities although they can lead to the identical equation of state for the symmetry nuclear matter as well as the identical symmetry energy for the isospin asymmetric nuclear matter. Consequently, these isospin-sensitive observables are also appreciably affected by the different density-dependent scenarios of in-medium nucleon-nucleon interactions. Therefore, according to these findings, it is suggested that effects of the separate density-dependent scenario of in-medium nucleon-nucleon interactions should be taken into account when probing the high-density symmetry energy using these isospin-sensitive observables in heavy-ion collisions.

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