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
Department of Physics, Sejong University, Seoul 05006, Republic of Korea.
Department of Physics and Wright Laboratory, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2019 Jul 19;123(3):031302. doi: 10.1103/PhysRevLett.123.031302.
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.
