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Necessity of extra repulsion in hypernuclear systems: Suggestion from neutron stars

  • T. Takatsuka
  • S. Nishizaki
  • Y. Yamamoto

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.

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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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • T. Takatsuka
    • 1
  • S. Nishizaki
    • 1
  • Y. Yamamoto
    • 2
  1. 1.Faculty of Humanities and Social Sciences, Iwate University Morioka 020-8550, JapanJP
  2. 2.Physics Section, Tsuru University, Tsuru 402-0054, JapanJP

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