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Monte Carlo computations of the quantum kinetic energy of rare-gas solids.

We report results from Monte Carlo computations for the average kinetic energy of rare-gas solids (neon, argon, krypton, and xenon), modeled by a Lennard-Jones all-neighbor interaction. The main motivation lies in the recent availability of direct experimental measurements of the average kinetic energy of solid neon, by means of deep-inelastic neutron scattering (DINS). In our computations we take strong advantage in using the effective potential technique, which has been proven to be very useful for systems where quantum effects are not too strong: the path-integral Monte Carlo (PIMC) can be replaced by the classical-like effective-potential Monte Carlo (EPMC), in such a way that the needed computer time is strongly reduced