Reconciliation of neutron-star masses and binding of the Lambda in hypernuclei

Details Reconciliation of neutron-star masses and binding of the Lambda in hypernuclei Reconciliation of neutron-star masses and binding of the Lambda in hypernuclei

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvl..67.2414g&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 67, Oct. 28, 1991, p. 2414-1417.

Astronomy and Astrophysics

Astrophysics

285

Hypernuclei, Neutron Stars, Nuclear Binding Energy, Stellar Mass, Hyperons, Nuclear Astrophysics

Scientific paper

By relating scalar and vector couplings of the hyperons to the inferred empirical binding of the Lambda hyperon in saturated nuclear matter, compatibility of this binding energy with neutron-star masses is obtained. Using the observational constraint on the lower bound on the maximum neutron-star mass and the upper bound of the couplings that are compatible with hypernuclear levels, bounds are placed on the reduction in neutron-star mass that hyperons produce. For the best current estimate of nuclear-matter properties, the reduction in mass due to conversion of nucleons to hyperons is (0.71 +/- 0.15) solar mass. Neutrons comprise a slight majority population in neutron stars with a mass of about 1.5 solar mass.

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