Physics – Nuclear Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nupha.462..791b&link_type=abstract
Nuclear Physics A, Volume 462, Issue 4, p. 791-802.
Physics
Nuclear Physics
50
Scientific paper
We investigate suggestions that quark matter with strangeness per baryon of order unity may be stable. We model this matter at nuclear matter densities as a gas of close packed Λ-particles. From the known mass of the Λ-particle we obtain an estimate of the energy and chemical potential of strange matter at nuclear densities. These are sufficiently high to preclude any phase transition from neutron matter to strange matter in the region near nucleon matter density. Including effects from gluon exchange phenomenologically, we investigate higher densities, consistently making approximations which underestimate the density of transition. In this way we find a transition density ρtr>~7ρ0, where ρ0 is nuclear matter density is not far from the maximum density in the center of the most massive neutron stars that can be constructed. Since we have underestimated ρtr and still find it to be ~7ρ0, we do not believe that the transition from neutron to quark matter is likely in neutron stars. Moreover, measured masses of observed neutron stars are ≅1.4 Msolar, where Msolar is the solar mass. For such masses, the central (maximum) density is ρc<5ρ0. Transition to quark matter is certainly excluded for these densities.
This research was supported in part by the National Science Foundation under grant No. PHY 82-17853, supplemented by funds from the National Aeronautics and Space Administration.
Bethe Hans A.
Brown Gerald E.
Cooperstein Jerry
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