Finite H-2 concentrations in superfluid He-4

We have studied the solubility of molecular hydrogen in bulk liquid He-4 at zero temperature using the diffusion Monte Carlo method and realistic inte ratomic potentials between the different species of the mixture. Around the He-4 equilibrium density, the H-2 molecules clusterize in liquid-like drop s blocking the existence of a uniform dilution. On the contrary, at higher densities the cluster formation is less feasible and metastable dilute solu tions may exist. (C) 2000 Elsevier Science B.V. All rights reserved.