arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2411.11751nucl-thnucl-ex
收藏

$ΛNN$ 对中子星的输入来自超核数据

$ΛNN$ input to neutron stars from hypernuclear data

Racah Institute of Physics, Hebrew University(希伯来大学雷切尔物理研究所)

Eliahu Friedman, Avraham Gal

AI总结:

本工作扩展超核单粒子结合能拟合至21个数据点,得到核物质密度下$ΛN$和$ΛNN$势深度,与早期结果一致,并指出排斥性$ΛNN$项对解决中子星“超子难题”至关重要,且其抑制特性可在JLab实验中检验。

摘要:

本工作是我们在2023年发表的两篇论文[PLB 837 137669, NPA 1039 122725]的续篇,在那两篇论文中,通过拟合周期表中超核的14个1$s_Λ$和1$p_Λ$单粒子结合能,我们得到了一个明确的$Λ$-核子光学势。该势由泡利修正的线性密度($ΛN$)项和二次密度($ΛNN$)项组成。本工作报告将上述分析扩展到21个$Λ$单粒子数据点,通过纳入中重和重超核中的1$d_Λ$和1$f_Λ$态。在核物质密度$ρ_0=0.17$~fm$^{-3}$下,$ΛN$和$ΛNN$势深度的升级结果分别为$D^{(2)}_Λ=-37.5\mp 0.7$~MeV和$D^{(3)}_Λ=+9.8\pm 1.2$~MeV,加上总深度$D_Λ=-27.7\pm 0.5$~MeV,与早期结果在误差范围内一致。与$ΛN$诱导的势深度$D^{(2)}_Λ$相关的$Λ$超核过度束缚,与最近对低能$Λp$散射数据和关联函数的综合分析[PLB 850 (2024) 138550]在定量上一致。这些结果,特别是排斥性$D^{(3)}_Λ$的大小,为解决中子星核心的“超子难题”提供了关键输入。我们还表明,我们$ΛNN$诱导势项的一个关键特性,即需要抑制涉及多余中子和$N=Z$核心核子的二次密度$ΛNN$项,可以在即将进行的JLab E12-15-008实验中得以检验。

英文摘要:

This work is a sequel to our two 2023 publications [PLB 837 137669, NPA 1039 122725] where fitting 14 1$s_Λ$ and 1$p_Λ$ single-particle binding energies in hypernuclei across the periodic table led to a well-defined $Λ$-nucleus optical potential. The potential consists of a Pauli modified linear-density ($ΛN$) and a quadratic-density ($ΛNN$) terms. The present work reports on extending the above analysis to 21 $Λ$ single-particle data points input by including 1$d_Λ$ and 1$f_Λ$ states in medium-weight and heavy hypernuclei. The upgraded results for the $ΛN$ and $ΛNN$ potential depths at nuclear-matter density $ρ_0=0.17$~fm$^{-3}$, $D^{(2)}_Λ=-37.5\mp 0.7$~MeV and $D^{(3)}_Λ=+9.8\pm 1.2$~MeV together with the total depth $D_Λ=-27.7\pm 0.5$~MeV, agree within errors with the earlier results. The $Λ$ hypernuclear overbinding associated with the $ΛN$-induced potential depth $D^{(2)}_Λ$ agrees quantitatively with a recent combined analysis of low-energy $Λp$ scattering data and correlation functions [PLB 850 (2024) 138550]. These results, particularly the size of the repulsive $D^{(3)}_Λ$, provide an essential input towards resolving the 'hyperon puzzle' in the core of neutron stars. We also show that a key property of our $ΛNN$-induced potential term, i.e. a need to suppress the quadratic-density $ΛNN$ term involving an excess neutron and a $N=Z$ core nucleon, can be tested in the forthcoming JLab E12-15-008 experiment.

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。

↑