DSpace at EWHA: Search for inelastic WIMP-iodine scattering with COSINE-100

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Search for inelastic WIMP-iodine scattering with COSINE-100

Authors: Adhikari; G.; Carlin; N.; Cho; J.Y.; Choi; J.J.; S.; Ezeribe; A.C.; França; L.E.; Ha; C.; Hahn; I.S.; Hollick; S.J.; Jeon; E.J.; Joo; H.W.; Kang; W.G.; Kauer; M.; Kim; B.H.; H.J.; J.; K.W.; S.H.; S.K.; S.W.; W.K.; Y.D.; Y.H.; Ko; Y.J.; Lee; D.H.; E.K.; H.; H.S.; H.Y.; M.H.; S.M.; Leonard; D.S.; Luan; N.T.; Manzato; B.B.; Maruyama; R.H.; Neal; R.J.; Nikkel; J.A.; Olsen; S.L.; Park; B.J.; H.K.; J.C.; K.S.; S.D.; Pitta; R.L.C.; Prihtiadi; Ra; Rott; Shin; K.A.; Cavalcante; D.F.F.S.; Scarff; A.; Son; M.K.; Spooner; N.J.C.; Truc; L.T.; Yang; L.; Yu; G.H.

Abstract: We report the results of a search for inelastic scattering of weakly interacting massive particles (WIMPs) off I127 nuclei using NaI(Tl) crystals with a data exposure of 97.7 kg·years from the COSINE-100 experiment. The signature of inelastic WIMP-I127 scattering is a nuclear recoil accompanied by a 57.6 keV γ-ray from the prompt deexcitation, producing a more energetic signal compared to the typical WIMP nuclear recoil signal. We found no evidence for this inelastic scattering signature and set a 90% confidence level upper limit on the WIMP-proton spin-dependent, inelastic scattering cross section of 1.2×10-37 cm2 at the WIMP mass 500 GeV/c2.