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The Ξ-nuclear potential constrained by recent Ξ- hypernuclei experiments
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DOI：10.1088/1361-6471/ac4469.png)
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Abstract
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The Xi-nuclear potential is investigated in the quark mean-field (QMF) model based on recent results on the Xi(-) + N-14 (15 Xi-C) system. The experimental data on the binding energy of 1p-state Xi(-) hyperon in 15 Xi-C hypernuclei in KISO, IBUKI, E07-T011, E176-14-03-35 events are merged as B Xi-(1p) = 1.14 +/- 0.11 MeV. With this constraint, the coupling strengths between the omega vector meson and Xi hyperon are fixed in three QMF parameter sets. At the same time, the Xi(-) binding energy of 1s state in 15 Xi-C is predicted as B Xi-(1s) = 5.66 +/- 0.38 MeV with the same interactions, completely consistent with the data from the KINKA and IRRAWADDY events. Finally, the Xi-nuclear potential is calculated in the symmetric nuclear matter in the same framework. It is found to be U-Xi = -11.96 +/- 0.85 MeV at nuclear saturation density, which is important for the discussions of the role of strangeness in a neutron star.
Keywords:
quark mean field model
single Xi-hypernuclei
Xi-nuclear potential
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