MONTE-CARLO ANALYSIS OF AN INTERATOMIC POTENTIAL FOR HE

By means of a quadratic diffusion Monte Carlo method we have performed a comparative analysis between the Aziz potential and a revised versi on of it. The results demonstrate that the revised version produces a better description of the equation of state for liquid He-4. In spite of the improvement in the description of derivative magnitudes of the energy, as the pressure or the compressibility, the energy per particl e which comes from this revised potential is lower than the experiment al one. The inclusion of three-body interactions, which give a repulsi ve contribution to the potential energy, makes it feasible that the ca lculated energy comes close to the experimental result.