New limits on WIMP interactions from the SIMPLE dark matter search
  The SIMPLE project uses superheated C2ClF5 liquid detectors to search for
particle dark matter candidates. We report the results of the first stage
exposure (14.1 kgd) of its latest two-stage, Phase II run, with 15 superheated
droplet detectors of total active mass 0.208 kg. In combination with the
results of the neutron-spin sensitive XENON10 experiment, these results yield a
limit of |a_p| < 0.32, |a_n| < 0.17 for M_W = 50 GeV/c2 on the
model-independent, spin-dependent sector of weakly interacting massive particle
(WIMP)-nucleus interactions, and together yield a 50% reduction in the
previously allowed region of the phase space. The result provides a contour
minimum of {\sigma}_p ~ 2.8 x 10-2 pb at M_W = 45 GeV/c2, constituting the most
restrictive direct detection limit to date against a spin-dependent WIMP-proton
coupling. In the spin-independent sector, the result is seen to offer the
prospect of contributing to the question of light mass WIMPs with an
improvement in the current understanding of its nucleation efficiency.
