ar X iv : n uc l - th / 9 60 80 25 v 1 1 3 A ug 1 99 6 Isospin Lattice - Gas Model and Liquid - Gas Phase Transition in Asymmetric Nuclear Matter
نویسنده
چکیده
An isospin lattice-gas model, which is a spin-1 Ising model, is employed to investigate the liquid-gas phase transition in asymmetric nuclear matter. We consider nuclear matter as a lattice where each lattice site can be either empty or occupied by a proton or a neutron, with a nearest-neighbor interaction among the nucleons. With the Bragg-Williams mean field approximation, we calculate various thermodynamic properties of nuclear matter for different densities and different proton-neutron asymmetry parameter s. Our model exhibits liquid-gas phase transition below a critical temperature T c , and predicts a monotonic decreasing of T c as the magnitude of s is increased. The dependence of the nuclear matter isotherms on the asymmetry parameter s is discussed.
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L. V. Grigorenko, 3 A. A. Korsheninnikov, and M. V. Zhukov Flerov Laboratory of Nuclear Reactions, JINR, RU-141980 Dubna, Russia Gesellschaft für Schwerionenforschung mbH, Planckstrasse 1, D-64291, Darmstadt, Germany RRC “The Kurchatov Institute”, Kurchatov sq. 1, 123182 Moscow, Russia Department of Physics, Chalmers University of Technology and Göteborg University, S-41296 Göteborg, Sweden (Da...
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تاریخ انتشار 2008