Search for inelastic WIMP-iodine scattering with COSINE-100

G. Adhikari,N. Carlin, J. Y. Cho,J. J. Choi,S. Choi, A. C. Ezeribe, L. E. Franca,C. Ha,I. S. Hahn, S. J. Hollick, E. J. Jeon, 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,S. W. 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, D. 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, J. C. 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, M. K. Son, N. J. C. Spooner, L. T. Truc, L. Yang, G. H. Yu

PHYSICAL REVIEW D（2023）

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摘要

We report the results of a search for inelastic scattering of weakly interacting massive particles (WIMPs) off 127I nuclei using NaI(Tl) crystals with a data exposure of 97.7 kg center dot years from the COSINE-100 experiment. The signature of inelastic WIMP -127I 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 x 10-37 cm2 at the WIMP mass 500 GeV/c2.

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