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Adhikari, G; Adhikari, P; de Souza, E Barbosa; Carlin, N; Choi, S; Djamal, M; Ezeribe, A C; Ha, C; Hahn, I S; Jeon, E J; Jo, J H; Joo, H W; Kang, W G; Kang, W; Kauer, M; Kim, G S; Kim, H; Kim, H J; Kim, K W; Kim, N Y; Kim, S K; Kim, Y D; Kim, Y H; Ko, Y J; Kudryavtsev, V A; Lee, H S; Lee, J; Lee, J Y; Lee, M H; Leonard, D S; Lynch, W A; Maruyama, R H; Mouton, F; Olsen, S L; Park, B J; Park, H K; Park, H S; Park, K S; Pitta, R L C; Prihtiadi, H; Ra, S J; Rott, C; Shin, K A; Scarff, A; Spooner, N J C; Thompson, W G; Yang, L; Yu, G H
Physical review letters, 2019-Jul-19, Volume: 123, Issue: 3Journal Article
We present new constraints on the dark matter-induced annual modulation signal using 1.7 years of COSINE-100 data with a total exposure of 97.7 kg yr. The COSINE-100 experiment, consisting of 106 kg of NaI(Tl) target material, is designed to carry out a model-independent test of DAMA/LIBRA's claim of WIMP discovery by searching for the same annual modulation signal using the same NaI(Tl) target. The crystal data show a 2.7 cpd/kg/keV background rate on average in the 2-6 keV energy region of interest. Using a χ-squared minimization method we observe best fit values for modulation amplitude and phase of 0.0092±0.0067 cpd/kg/keV and 127.2±45.9 d, respectively.
