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首页> 外文期刊>Physical review, C >Single-particle potential of the Lambda hyperon in nuclear matter with chiral effective field theory NLO interactions including effects of Y N N three-baryon interactions
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Single-particle potential of the Lambda hyperon in nuclear matter with chiral effective field theory NLO interactions including effects of Y N N three-baryon interactions

机译：具有手性有效领域理论NLO相互作用的核问题的单粒子潜力，包括Y N n三缩醛相互作用的影响

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摘要

Adopting hyperon-nucleon and hyperon-nucleon-nucleon interactions parametrized in chiral effective field theory, single-particle potentials of the Lambda and Sigma hyperons are evaluated in symmetric nuclear matter and in pure neutron matter within the framework of lowest-order Bruckner theory. The chiral NLO interaction bears strong Lambda N-Sigma N coupling. Although the Lambda potential is repulsive if the coupling is switched off, the Lambda N-Sigma N correlation brings about the attraction consistent with empirical data. The Lambda potential is repulsive, which is also consistent with empirical information. The interesting result is that the Lambda potential becomes shallower beyond normal density. This provides the possibility of solving the hyperon puzzle without introducing ad hoc assumptions. The effects of the Lambda NN-Lambda NN and Lambda NN-Sigma NN three-baryon forces are considered. These three-baryon forces are first reduced to normal-ordered effective two-baryon interactions in nuclear matter and then incorporated in the G-matrix equation. The repulsion from the Lambda NN-Sigma NN interaction is of the order of 5 MeV at normal density and becomes larger with increasing density. The effects of the Lambda NN-Sigma NN coupling compensate the repulsion at normal density. The net effect of the three-baryon interactions on the Lambda single-particle potential is repulsive at higher densities.
机译：采用高核核聚核分和高核核心 - 核核酸相互作用在手性有效场理论中，在最低阶布鲁克纳理论的框架内，在对称核物质和纯中子物质中评估λ和σ的单粒子电位。手性NLO相互作用承受强烈的λn-sigma n耦合。虽然如果耦合关闭偶联的λ电位是令人厌恶的，但是Lambda n-Sigma N相关性带来了与经验数据一致的吸引力。 Lambda潜力是令人厌恶的，这也与经验信息一致。有趣的结果是Lambda电位超越正常密度。这提供了在不引入临时假设的情况下解决超谐拼图的可能性。考虑了Lambda NN-Lambda NN和Lambda NN-Sigma NN三脉压力的影响。首先将这些三个重孔力减少到核物质中的正常有效的双胸序相互作用，然后在G矩阵方程中掺入。从λnn-sigma nn相互作用的排斥率为5mev的正常密度，随着密度的增加而变大。 Lambda NN-Sigma NN耦合的影响在正常密度下补偿了排斥。在较高密度下扰流λ单粒子电位对λ单粒子电位的三缩合相互作用的净效应。

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