Kavli Affiliate: Masaki Yamashita
| Summary:
XMASS-I uses single phase liquid xenon technology for aiming at the direct detection of dark matter. The detector observes only scintillation light by 2 inch 642 PMTs which are placed in sphere shape around an active volume. With its large mass target and high photoelectron yield, we conducted a search for dark matter by annual modulation with 832 kg $times$ 359.2 days exposure of data. We find no modulation signal in the data so that we set an upper limit 4.3$times10^-41 rmcm^2 $ at WIMP mass of 8 GeV/$c^2$ which excluded an interpreted DAMA/LIBRA allowed region.
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