High-quality variational wave functions for small4Heclusters

We report a variational calculation of ground state energies and radii of ${}^4{\mathrm{He}}_N$ droplets $(3\mathrm{}<~N<~40),$ using the Aziz HFD-B (HE) atom-atom interaction. The trial wave function has a simple structure, combining two- and three-body correlation functions coming from a translationally invariant configuration-interaction description, and Jastrow-type short-range correlations. The calculated ground state energies differ by around 2% from the diffusion Monte Carlo results.