Single-particle potential of the Λ hyperon in nuclear matter with chiral effective field theory NLO interactions including effects of YNN three-baryon interactions
Single-particle potential of the Λ hyperon in nuclear matter with chiral effective field theory NLO interactions including effects of YNN three-baryon interactions
复制标题
核物质中 Λ 超子的单粒子势与手性有效场论 NLO 相互作用，包括 YNN 三重子相互作用的影响
DOI：
10.1103/physrevc.97.035206
复制
发表时间：
2018
影响因子：
3.1
通讯作者：
Kohno M.
中科院分区：
文献类型：
--
作者：
Kohno M.
采用手征有效场论参数化的超子-核子和超子-核子-核子相互作用，在最低阶Bruckner理论框架下，计算了对称核物质和纯中子物质中超子和超子的单粒子势.手性NLO相互作用具有强耦合性。虽然当耦合被切断时，势是排斥的，但这种关联产生的吸引力与经验数据一致。势是排斥的，这也与经验信息相一致。有趣的结果是，超过正常密度，电势变得更浅。这就为解决超子之谜而不引入附加假设提供了可能性。考虑了两个和三个重子力的影响。这些三重子力首先减少到正常有序的有效的两个重子在核物质的相互作用，然后纳入矩阵方程。在正常密度下，相互作用产生的排斥力约为5 MeV，并随着密度的增加而增大。在正常密度下，耦合的效果补偿了排斥。在较高密度下，三重子相互作用对单粒子势的净效应是排斥的。
Adopting hyperon-nucleon and hyperon-nucleon-nucleon interactions parametrized in chiral effective field theory, single-particle potentials of theandhyperons are evaluated in symmetric nuclear matter and in pure neutron matter within the framework of lowest-order Bruckner theory. The chiral NLO interaction bears strongcoupling. Although thepotential is repulsive if the coupling is switched off, thecorrelation brings about the attraction consistent with empirical data. Thepotential is repulsive, which is also consistent with empirical information. The interesting result is that thepotential becomes shallower beyond normal density. This provides the possibility of solving the hyperon puzzle without introducingad hocassumptions. The effects of theandthree-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-matrix equation. The repulsion from theinteraction is of the order of 5 MeV at normal density and becomes larger with increasing density. The effects of thecoupling compensate the repulsion at normal density. The net effect of the three-baryon interactions on thesingle-particle potential is repulsive at higher densities.