Abstract
XMASS-I is a single-phase liquid xenon detector located underground in Kamioka Observatory mainly aiming direct detection of dark matter. We performed a WIMP search in a fiducial volume containing 96.5 kg liquid xenon using 705.9 live days of data between November 2013 and March 2016. All events remaining in the fiducial volume after data reduction were consistent with only background prediction from careful evaluation of it. In conclusion, a 90% confidence level upper limit on the spin-independent WIMP-nucleon cross section of 2.2×10−44 cm2 for a WIMP mass of 60 GeV/c2 was derived.
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