Isospin lattice gas model and liquid-gas phase transition in asymmetric nuclear matter

Liquid-gas phase transition in asymmetric nuclear matter is investigated with an isospin lattice gas model. Nuclear matter is considered as a lattice with each lattice site either empty or occupied by a proton or a neutron, with a nearest-neighbor interaction between the nucleons. The Bragg-Williams mean field approximation is employed to evaluate the thermodynamic potential. Our model exhibits liquid-gas phase transition below a critical temperature.