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The ZEPLIN-III experiment in the Palmer Underground Laboratory at Boulby usesa 12kg two-phase xenon time projection chamber to search for the weaklyinteracting massive particles (WIMPs) that may account for the dark matter ofour Galaxy. The detector measures both scintillation and ionisation produced byradiation interacting in the liquid to differentiate between the nuclearrecoils expected from WIMPs and the electron recoil background signals down to~10keV nuclear recoil energy. An analysis of 847kg.days of data acquiredbetween February 27th 2008 and May 20th 2008 has excluded a WIMP-nucleonelastic scattering spin-independent cross-section above 8.1x10(-8)pb at55GeV/c2 with a 90% confidence limit. It has also demonstrated that thetwo-phase xenon technique is capable of better discrimination between electronand nuclear recoils at low-energy than previously achieved by other xenon-basedexperiments.

Results from the First Science Run of the ZEPLIN-III Dark Matter Search Experiment