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Fock terms in the quark-meson coupling model

✍ Scribed by G. Krein; A.W. Thomas; K. Tsushima

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
606 KB
Volume
650
Category
Article
ISSN
0375-9474

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✦ Synopsis

The mean field description of nuclear matter in the quark-meson coupling model is improved by the inclusion of exchange contributions (Fock terms). The inclusion of Fock terms allows us to explore the momentum dependence of meson-nucleon vertices and the role of pionic degrees of freedom in matter. It is found that the Fock terms maintain the previous predictions of the model for the in-medium properties of the nucleon and for the nuclear incompressibility. The Fock terms significantly increase the absolute values of the single-particle, four-component scalar and vector potentials, a feature that is relevant for the spin-orbit splitting in finite nuclei. (~) 1999 Elsevier Science B.V.

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The quark-meson-coupling model is used to study droplet formation from the liquid-gas phase transition in cold asymmetric nuclear matter. The critical density and proton fraction for the phase transition are determined in the mean field approximation. Droplet properties are calculated in the Thomas-