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We report the results of a search for inelastic scattering of weaklyinteracting massive particles (WIMPs) off $^{127}$I nuclei using NaI(Tl)crystals with a data exposure of 97.7 kg$\cdot$years from the COSINE-100experiment. The signature of inelastic WIMP-$^{127}$I scattering is a nuclearrecoil accompanied by a 57.6 keV $\gamma$-ray from the prompt deexcitation,producing a more energetic signal compared to the typical WIMP nuclear recoilsignal. We found no evidence for this inelastic scattering signature and set a90 $\%$ confidence level upper limit on the WIMP-proton spin-dependent,inelastic scattering cross section of $1.2 \times 10^{-37} {\rm cm^{2}}$ at theWIMP mass 500 ${\rm GeV/c^{2}}$.

Search for inelastic WIMP-iodine scattering with COSINE-100