Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment.
作者信息
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
机构信息
Department of Physics, Sejong University, Seoul 05006, Republic of Korea.
Department of Physics and Wright Laboratory, Yale University, New Haven, Connecticut 06520, USA.
出版信息
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.
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