OUANTUM-HARD-SPHERE SYSTEM EQUATIONS OF STATE REVISITED

Analytical equations of state for boson and fermion hard-sphere fluids ranging from very low to very high densities are constructed. Such eq uations of state serve as a zero-order (reference) state upon which to build so-called quantum-thermodynamic-perturbation corrections in des cribing real but simple quantum fluids at zero temperature. The fluid branch extrapolations from the exact low-density series expansions For the energy are carried out by incorporating various physical argument s, such as close packing densities and residues. Modified London equat ions of state for the high-density crystalline branch agree very well with computer simulations, and at close packing with certain experimen tal results at high pressure. (C) 1996 Academic Press, Inc.