  The ground state of a two-dimensional (2D) system of Bose particles of spin
zero, interacting via a repulsive Gaussian-Core potential, has been
investigated by means of Quantum Monte Carlo simulations. The quantum phase
diagram is qualitatively identical to that of 2D Yukawa bosons. While the
system is a fluid at all densities for weak coupling, in the strong coupling
regime it transitions upon compression from a low density superfluid to a
crystal, and then into a reentrant superfluid phase. No evidence of a
(supersolid) cluster crystal phase is seen.
