Necessity of extra repulsion in hypernuclear systems: Suggestion from neutron stars |
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| Authors: | T. Takatsuka S. Nishizaki Y. Yamamoto |
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| Affiliation: | (1) Faculty of Humanities and Social Sciences, Iwate University Morioka 020-8550, Japan, JP;(2) Physics Section, Tsuru University, Tsuru 402-0054, Japan, JP |
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| Abstract: | Neutron star models with hyperon-mixed core are studied by a realistic approach to use the YN and the YY interactions consistent with hypernuclear data. From the compatibility of the theoretical maximum mass with the observed neutron star mass 1.44 M ⊙ of PSR1913+16, the necessity of some extra repulsion in hypernuclear systems, e.g., a repulsion from three-body force, is stressed. It is noted that the increase of baryon degrees of freedom to avoid the short-range repulsion effectively is an essential mechanism causing the Y-mixed phase. Received: 1 May 2001 / Accepted: 4 December 2001 |
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| Keywords: | PACS. 26.60.+c Nuclear matter aspects of neutron stars – 13.75.Ev Hyperon-nucleon interactions – 21.80.+a Hypernuclei – 21.65.+f Nuclear matter |
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