Isospin Lattice Gas Model and Nuclear-matter Phase Diagram and Pressure-volume Isotherms
نویسندگان
چکیده
We study a cubic lattice gas model for nuclear matter where each lattice site can be either occupied, by one proton or one neutron, or unoccupied. A nearest-neighbor interaction of the form − J ij τ zi τ zj is assumed. Our model is an isospin-1 Ising model, with τ z = (1,0,-1) representing respectively (proton, vacancy, neutron). A kinetic-energy term has been included in our model. Under the Bragg-Williams mean field approximation our model exhibits the existence of a dense phase (liquid-like) and a rare phase (gas-like). The nuclear-matter p-v isotherms given by our model are discussed.
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