Abstract
Three dark matter experiments are currently running at Boulby: 1) NAIAD an array of NaI(T1) crystals; 2) ZEPLIN I a liquid Xe scintillation detector; and 3) DRIFT I a lowpressure gas TPC. NAIAD and ZEPLIN use pulse shape analysis to discriminate between electron recoils, caused by gamma background, and nuclear recoils, which can be produced by WIMPS dark matter candidates. NAIAD consists of 2 encapsulated and 6 unencapsulated NaI crystals with the total mass of 65 kg. The detectors do not show the anomalous fast component previously found in several encapsulated crystals [l]. 10.6 kgx year of exposure of 4 detectors have been used to set upper limits on spin-independent WIMP-nucleon cross-section as shown in the Figure (thin solid line). Improvement in the light yield, noise rejection and analysis technique together with increased statistics should result in a factor of 10 improvement in the limits over the next 3 years of data taking.
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