Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment

G Adhikari; P Adhikari; E Barbosa de Souza; N Carlin; S Choi; M Djamal; A C Ezeribe; C Ha; I S Hahn; E J Jeon; J H Jo; H W Joo; W G Kang; W Kang; M Kauer; G S Kim; H Kim; H J Kim; K W Kim; N Y Kim; S K Kim; Y D Kim; Y H Kim; Y J Ko; V A Kudryavtsev; H S Lee; J Lee; J Y Lee; M H Lee; D S Leonard; W A Lynch; R H Maruyama; F Mouton; S L Olsen; B J Park; H K Park; H S Park; K S Park; R L C Pitta; H Prihtiadi; S J Ra; C Rott; K A Shin; A Scarff; N J C Spooner; W G Thompson; L Yang; G H Yu; COSINE-100 Collaboration

doi:10.1103/PhysRevLett.123.031302

Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment

Phys Rev Lett. 2019 Jul 19;123(3):031302. doi: 10.1103/PhysRevLett.123.031302.

Authors

G Adhikari¹, P Adhikari¹, E Barbosa de Souza², N Carlin³, S Choi⁴, M Djamal⁵, A C Ezeribe⁶, C Ha⁷, I S Hahn⁸, E J Jeon⁷, J H Jo², H W Joo⁴, W G Kang⁷, W Kang⁹, M Kauer¹⁰, G S Kim¹¹, H Kim⁷, H J Kim¹¹, K W Kim⁷, N Y Kim⁷, S K Kim⁴, Y D Kim^{1

7

12}, Y H Kim^{7

12

13}, Y J Ko⁷, V A Kudryavtsev⁶, H S Lee^{7

12}, J Lee⁷, J Y Lee¹¹, M H Lee^{7

12}, D S Leonard⁷, W A Lynch⁶, R H Maruyama², F Mouton⁶, S L Olsen⁷, B J Park¹², H K Park¹⁴, H S Park¹³, K S Park⁷, R L C Pitta³, H Prihtiadi⁵, S J Ra⁷, C Rott⁹, K A Shin⁷, A Scarff⁶, N J C Spooner⁶, W G Thompson², L Yang¹⁵, G H Yu⁹; COSINE-100 Collaboration

Affiliations

¹ Department of Physics, Sejong University, Seoul 05006, Republic of Korea.
² Department of Physics and Wright Laboratory, Yale University, New Haven, Connecticut 06520, USA.
³ Physics Institute, University of São Paulo, 05508-090, São Paulo, Brazil.
⁴ Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
⁵ Department of Physics, Bandung Institute of Technology, Bandung 40132, Indonesia.
⁶ Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom.
⁷ Center for Underground Physics, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea.
⁸ Department of Science Education, Ewha Womans University, Seoul 03760, Republic of Korea.
⁹ Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea.
¹⁰ Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
¹¹ Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea.
¹² IBS School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea.
¹³ Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
¹⁴ Department of Accelerator Science, Korea University, Sejong 30019, Republic of Korea.
¹⁵ Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

PMID: 31386435
DOI: 10.1103/PhysRevLett.123.031302

Abstract

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.