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PATH INTEGRAL CALCULATION OF THE TWOPARTICLE SLATER SUM FOR HE4,
ILLINOIS UNIV URBANA DEPT OF COMPUTER SCIENCE
The Wiener integral formulation combined with Monte Carlo sampling has been used to compute the two-particle Slater sum for He4 for temperatures ranging from 273K down to 2K, the lower practical limit for this computational method. This is equivalent to a calculation of the density independent part of the pair distribution function. A Lennard-Jones 6-12 potential has been used to describe the interaction. Contributions from exchange were found negligible at 5K and above. Comparisons with the WignerKirkwood expansion are made. The second virial coefficients derived from these results are within two per cent or three per cent of the results obtained from the usual phase shift calculation. Author