Eur. Phys. J. A 13, 213-215 (2002)
Necessity of extra repulsion in hypernuclear systems: Suggestion from neutron starsT. Takatsuka1, S. Nishizaki1 and Y. Yamamoto2
1 Faculty of Humanities and Social Sciences, Iwate University Morioka 020-8550, Japan
2 Physics Section, Tsuru University, Tsuru 402-0054, Japan
(Received: 1 May 2001 / Revised version: 8 July 2001)
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 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.
26.60.+c - Nuclear matter aspects of neutron stars.
13.75.Ev - Hyperon-nucleon interactions.
21.80.+a - Hypernuclei.
21.65.+f - Nuclear matter.
© Società Italiana di Fisica, Springer-Verlag 2002