Direct Dark Matter Search with XMASS-I
  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} \rm{cm}^{2} $ at WIMP mass of 8 GeV/$c^{2}$ which excluded
an interpreted DAMA/LIBRA allowed region.
