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Lee, H. S.; Bhang, H.; Choi, J. H.; Choi, S.; Hahn, I. S.; Jeon, E. J.; Joo, H. W.; Kang, W. G.; Kim, B. H.; Kim, G. B.; Kim, H. J.; Kim, J. H.; Kim, K. W.; Kim, S. C.; Kim, S. K.; Kim, Y. D.; Kim, Y. H.; Lee, J. H.; Lee, J. K.; Lee, S. J.; Leonard, D. S.; Li, J.; Li, Y. J.; Li, X. R.; Myung, S. S.; Olsen, S. L.; Park, J. W.; Seong, I. S.; So, J. H.; Yue, Q.
Physical review. D, Particles, fields, gravitation, and cosmology, 09/2014, Volume: 90, Issue: 5Journal Article
We present a search for low-mass (< or = 20 GeV /c super(2)) weakly interacting massive particles (WIMPs), strong candidates of dark matter particles, using the low-background CsI(Tl) detector array of the Korea Invisible Mass Search experiment. With a total data exposure of 24,524.3 kg days, we search for WIMP interaction signals produced by nuclei recoiling from WIMP-nuclear elastic scattering with visible energies between 2 and 4 keVee (electron-equivalent energy). The observed energy distribution of candidate events is consistent with null signals, and upper limits of the WIMP-proton spin-independent interaction are set with a 90% confidence level. The observed limit covers most of the low-mass region of parameter space favored by the DAMA annual modulation signal assuming the standard halo model.
