NaIAD EXPERIMENT FOR WIMP SEARCH AT BOULBY MINE AND RECENT RESULTS
The NaIAD experiment (Nal Advanced Detector) for WIMP dark matter search at Boulby mine (UK) is described. The detector consists of an array of independent encapsulated and unencapsulated NaI(Tl) crystals with high light yield and low background. Eight modules are currently collecting data. Data from four modules (10.6 kg×years exposure) have been analysed to set limits on the WIMP-nucleon spin-independent and spin-dependent cross-sections. Pulse shape analysis was applied to discriminate between nuclear recoil events, possibly caused by WIMP interactions and electron recoil events due to gamma background. New analysis techniques have been developed to reject PMT noise events from experimental data, which are expected to significantly improve the sensitivity of the experiment.
