2019 Impact factor 2.176
Hadrons and Nuclei


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. Yamamoto2

1  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 $M_{\odot}$ 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.

© Società Italiana di Fisica, Springer-Verlag 2002