THE SIMPLE-CUBIC LATTICE-GAS WITH NEAREST-NEIGHBOR EXCLUSION - ISING UNIVERSALITY

The lattice gas with nearest neighbour-exclusion on the simple cubic l attice is studied by means of statistically accurate Monte Carlo simul ations with an efficient cluster algorithm. Our results for critical e xponents are y(h) = 2.47(1) and y(t) = 1.60(2). These results agree we ll with the three-dimensional Ising universality class. We explain the discrepancy with an earlier study. The critical activity is z(c) = 1. 0559 (1). The size distribution of the clusters indicates that the per colation threshold of the cluster formation process of the Monte Carlo algorithm coincides with the critical point.