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arxiv: 2307.09814 · v2 · pith:WENDDTXInew · submitted 2023-07-19 · ✦ hep-ex · physics.ins-det

Search for inelastic WIMP-iodine scattering with COSINE-100

G. Adhikari , N. Carlin , J. J. Choi , S. Choi , A. C. Ezeribe , L. E. Franca , C. Ha , I. S. Hahn
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S. J. Hollick E. J. Jeon J. H. Jo H. W. Joo W. G. Kang M. Kauer B. H. Kim H. J. Kim J. Kim K. W. Kim S. H. Kim S. K. Kim W. K. Kim Y. D. Kim Y. H. Kim Y. J. Ko D. H. Lee E. K. Lee H. Lee H. S. Lee H. Y. Lee I. S. Lee J. Lee J. Y. Lee M. H. Lee S. H. Lee S. M. Lee Y. J. Lee S. Leonard N. T. Luan B. B. Manzato R. H. Maruyama R. J. Neal J. A. Nikkel S. L. Olsen B. J. Park H. K. Park H. S. Park K. S. Park S. D. Park R. L. C. Pitta H. Prihtiadi S. J. Ra C. Rott K. A. Shin D. F. F. S. Cavalcante A. Scarff N. J. C. Spooner W. G. Thompson L. Yang G. H. Yu
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classification ✦ hep-ex physics.ins-det
keywords inelasticscatteringcosine-100nuclearrecoilsearchsignalsignature
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We report the results of a search for inelastic scattering of weakly interacting massive particles (WIMPs) off $^{127}$I nuclei using NaI(Tl) crystals with a data exposure of 97.7 kg$\cdot$years from the COSINE-100 experiment. The signature of inelastic WIMP-$^{127}$I scattering is a nuclear recoil accompanied by a 57.6 keV $\gamma$-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 $1.2 \times 10^{-37} {\rm cm^{2}}$ at the WIMP mass 500 ${\rm GeV/c^{2}}$.

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