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The inelastic scattering of Weakly Interacting Massive Particles (WIMPs) and  129 Xe nuclei was searched for in the XMASS experiment. When excited by the inelastic scattering, the nuclei emit 39.6 keV γ-ray. The exposure of the data was 327 kg × 800.0 days. To improve the sensitivity of the signal, the events were classified by their pulse shapes, which discriminates between γ-rays and  β -rays. As no significant signal was found, the upper limits of the inelastic channel cross section at the 90% confidence level were set. For a 200 GeV/ c 2  WIMP, the limit was 4.1 × 10 −39  cm 2 . This is the most stringent limit of the SD WIMP-neutron interaction.

Search for WIMP-129Xe inelastic scattering using particle identification in the XMASS experiment

Search for WIMP-¹²⁹Xe inelastic scattering using particle identification in the XMASS experiment