Energy Properties of Strange Quark Matter Studied in Constituent Quark Model : Nuclear Physics

概要

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We study energy properties of strange quark matter (SQM) in an approach based on the constituent quark model. In treating the infinite matter, SQM is modeled on a cubic lattice composed of the 1s-closed shell (Q_s) clusters, by extending a cluster-theoretical approach previously made for finite strange quark systems of Q_s-clusters. The energy per baryon of this SQM monotonically increases as the inter-Q_s distance decreases (the density of Q_s-clusters as well as the average baryon number density increases). This means that Q_s-clusters do not fuse to the Fermi-gas like SQM and favor to be far apart from each other. The mechanism causing such tendency is the following; the repulsive contributions to the inter-Q_s energy coming from the kinetic energy and the color magnetic interaction overwhelm the attractive ones from the color electric interaction and, except for the internal energy of Q_s, the contributions from a confinement potential play no essential role. The energy of SQM per baryon can never be less than that of a single Q_s which is higher by about 400〜500 MeV than the nucleon mass. Therefore the appearance of the absolutely stable SQM is unlikely in this model.Saturation property of SQM and surface effects are also discussed.
理論物理学刊行会の論文
1994-07-25