RESEARCH NOTE Fifth virial coefficient of a hard-sphere mixture.

The fifth virial coefficient is computed of a binary mixture composed of different-size hard spheres with additive diameters. The irreducible cluster integrals are evaluated numerically using the Monte Carlo method. It is found that the fifth virial coefficient becomes slightly negative for very different sizes of the two species in a regime of high dilution of the larger-sphere component. [ABSTRACT FROM AUTHOR]