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Background modeling for dark matter search with 1.7 years of COSINE-100 data

Authors
Adhikari, G.de Souza, E. BarbosaCarlin, N.Choi, J. J.Choi, S.Djamal, M.Ezeribe, A. C.Franca, L. E.Ha, C.Hahn, I. S.Jeon, E. J.Jo, J. H.Joo, H. W.Kang, W. G.Kauer, M.Kim, H.Kim, H. J.Kim, K. W.Kim, S. H.Kim, S. K.Kim, W. K.Kim, Y. D.Kim, Y. H.Ko, Y. J.Lee, E. K.Lee, H.Lee, H. S.Lee, H. Y.Lee, I. S.Lee, J.Lee, J. Y.Lee, M. H.Lee, S. H.Lee, S. M.Leonard, D. S.Lynch, W. A.Manzato, B. B.Maruyama, R. H.Neal, R. J.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.
Issue Date
9월-2021
Publisher
SPRINGER
Citation
EUROPEAN PHYSICAL JOURNAL C, v.81, no.9
Indexed
SCIE
SCOPUS
Journal Title
EUROPEAN PHYSICAL JOURNAL C
Volume
81
Number
9
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136442
DOI
10.1140/epjc/s10052-021-09564-0
ISSN
1434-6044
Abstract
We present a background model for dark matter searches using an array of NaI(Tl) crystals in the COSINE-100 experiment that is located in the Yangyang underground laboratory. The model includes background contributions from both internal and external sources, including cosmogenic radionuclides and surface Pb-210 contamination. To build the model in the low energy region, with a threshold of 1 keV, we used a depth profile of Pb-210 contamination in the surface of the NaI(Tl) crystals determined in a comparison between measured and simulated spectra. We also considered the effect of the energy scale errors propagated from the statistical uncertainties and the nonlinear detector response at low energies. The 1.7 years COSINE-100 data taken between October 21, 2016 and July 18, 2018 were used for this analysis. Our Monte Carlo simulation provides a non-Gaussian peak around 50 keV originating from beta decays of bulk Pb-210 in a good agreement with the measured background. This model estimates that the activities of bulk Pb-210 and H-3 are dominating the background rate that amounts to an average level of 2.85 +/- 0.15 counts/day/keV/kg in the energy region of (1-6) keV, using COSINE-100 data with a total exposure of 97.7 kg.years.
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