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arXiv 1408.4492nucl-th
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从超核到中子星内核的量子蒙特卡罗研究

From hypernuclei to the Inner Core of Neutron Stars: A Quantum Monte Carlo Study

Diego Lonardoni, Francesco Pederiva, Stefano Gandolfi

摘要:

用辅助场扩散蒙特卡罗(AFDMC)方法修正了超核中$Λ$超子与核子的相互作用。受唯象的阿贡-厄巴纳力的启发,用于描述相互作用的方案是由Bodmer,Usmani等人首先引入的$ΛN+ΛNN$势。在这个框架内,我们进行了计算轻和中等质量的超核,以评估三体部分的排斥贡献的程度。通过调整这一贡献,以重现$^5_Λ$ He和$^{17}_{~Λ}$ O中的$Λ$分离能,实验结果在很宽的质量范围内重现。然后,计算已扩展到$Λ$ -中子物质,以获得一个类似的对称性能量,用于确定物质的状态方程中发现的典型条件下,在中子星的内核。

英文摘要:

Auxiliary Field Diffusion Monte Carlo (AFDMC) calculations have been employed to revise the interaction between $Λ$-hyperons and nucleons in hypernuclei. The scheme used to describe the interaction, inspired by the phenomenological Argonne-Urbana forces, is the $ΛN+ΛNN$ potential firstly introduced by Bodmer, Usmani et al.. Within this framework, we performed calculations on light and medium mass hypernuclei in order to assess the extent of the repulsive contribution of the three-body part. By tuning this contribution in order to reproduce the $Λ$ separation energy in $^5_Λ$He and $^{17}_{~Λ}$O, experimental findings are reproduced over a wide range of masses. Calculations have then been extended to $Λ$-neutron matter in order to derive an analogous of the symmetry energy to be used in determining the equation of state of matter in the typical conditions found in the inner core of neutron stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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