  Based on exact numerical calculations, we show that the generalized Kagome
spin model in the easy axis limit exhibits a spin liquid, topologically
degenerate ground state over a broad range of phase space. We present an (to
our knowledge the first) explicit calculation of the gap (and dispersion) of
``vison'' excitations, and exponentially decaying spin and vison 2-point
correlators, hallmarks of deconfined, fractionalized and gapped spinons. The
region of the spin liquid phase includes a point at which the model is
equivalent to a Heisenberg model with purely two-spin interactions. Beyond this
range, a negative ``potential'' term tunes a first order transition to a
magnetic ordered state. The nature of the phase transition is also discussed in
light of the low energy spectrum. These results greatly expand the results and
range of a previous study of this model in the vicinity of an exactly soluble
point.
