http://www.sciencedirect.com/science/article/B6TJ1-4SWWT2R-1/1/e220f50dd0c4e31ff6877963d6b26778
Results are presented from the first underground data run of ZEPLIN-II, a 31 kg two-phase xenon detector developed to observe nuclear recoils from hypothetical weakly interacting massive dark matter particles. Discrimination between nuclear recoils and background electron recoils is afforded by recording both the scintillation and ionisation signals generated within the liquid xenon, with the ratio of these sig...
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