Eur. Phys. J. A 13, 213-215 (2002)
Necessity of extra repulsion in hypernuclear systems: Suggestion from neutron stars
T. Takatsuka1, S. Nishizaki1 and Y. Yamamoto21 Faculty of Humanities and Social Sciences, Iwate University Morioka 020-8550, Japan
2 Physics Section, Tsuru University, Tsuru 402-0054, Japan
takatuka@iwate-u.ac.jp
nisizaki@iwate-u.ac.jp
yamamoto@tsuru.ac.jp
(Received: 1 May 2001 / Revised version: 8 July 2001)
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
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
