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Background modeling for dark matter search with 1.7 years of COSINE-100 data
- Title
- Background modeling for dark matter search with 1.7 years of COSINE-100 data
- Authors
- Adhikari, G.; de Souza, E. Barbosa; Carlin, 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.
- Ewha Authors
- 한인식
- SCOPUS Author ID
- 한인식
- Issue Date
- 2021
- Journal Title
- EUROPEAN PHYSICAL JOURNAL C
- ISSN
- 1434-6044
1434-6052
- Citation
- EUROPEAN PHYSICAL JOURNAL C vol. 81, no. 9
- Publisher
- SPRINGER
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- 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.
- DOI
- 10.1140/epjc/s10052-021-09564-0
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
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