Background modeling for dark matter search with 1.7 years of COSINE-100 data
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Published:2021-09
Issue:9
Volume:81
Page:
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ISSN:1434-6044
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Container-title:The European Physical Journal C
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language:en
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Short-container-title:Eur. Phys. J. C
Author:
Adhikari G., de Souza E. Barbosa, Carlin N., Choi J. J., Choi S., Djamal M., Ezeribe A. C., França 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.ORCID, 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.,
Abstract
AbstractWe 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 $$^{210}$$
210
Pb contamination. To build the model in the low energy region, with a threshold of 1 keV, we used a depth profile of $$^{210}$$
210
Pb 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 $$^{210}$$
210
Pb in a good agreement with the measured background. This model estimates that the activities of bulk $$^{210}$$
210
Pb and $$^{3}$$
3
H are dominating the background rate that amounts to an average level of $$2.85\pm 0.15$$
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$$\cdot $$
·
years.
Funder
Alfred P. Sloan Foundation Coordenação de Aperfeiçoamento de Pessoal de Nível Superior National Research Foundation of Korea Fundação de Amparo à Pesquisa do Estado de São Paulo Science and Technology Facilities Council Institute for Basic Science Conselho Nacional de Desenvolvimento Científico e Tecnológico
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Reference23 articles.
1. G. Adhikari et al., Eur. Phys. J. C 78, 107 (2018) 2. G. Adhikari et al., Nature 564(7734), 83–86 (2018) 3. G. Adhikari et al., Phys. Rev. Lett. 123, 031302 (2019) 4. R. Bernabei et al., Eur. Phys. J. C 73, 2648 (2013) 5. R. Bernabei et al., Nucl. Phys. At. Energy 19, 307 (2018)
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