  We provide numerical evidence that the ground state of a short range
interaction model at $\nu=1/2$ is incompressible and spin-singlet for a wide
range of repulsive interactions. Furthermore it is accurately described by a
trial wave function studied earlier. For the Coulomb interaction we find that
this wave function provides a good description of the lowest lying spin-singlet
state, and propose that fractional quantum Hall effect would occur at $\nu=1/2$
if this state became the global ground state.
