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Study of cosmogenic radionuclides in the COSINE-100 NaI(Tl) detectors

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Autor(es):
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de Souza, E. Barbosa [1] ; Park, B. J. [2] ; Adhikari, G. [3] ; Adhikari, P. [4, 3] ; Carlin, N. [5] ; Choi, J. J. [6] ; Choi, S. [6] ; Djamal, M. [7] ; Ezeribe, A. C. [8] ; Ha, C. [9] ; Hahn, I. S. [10] ; Jeon, E. J. [9] ; Jo, J. H. [1] ; Kang, W. G. [9] ; Kauer, M. [11, 12] ; Kim, G. S. [13] ; Kim, H. [9] ; Kim, H. J. [13] ; Kim, K. W. [9] ; Kim, N. Y. [9] ; Kim, S. K. [6] ; Kim, Y. D. [3, 9, 2] ; Kim, Y. H. [14, 9, 2] ; Ko, Y. J. [9] ; Kudryavtsev, V. A. [8] ; Lee, E. K. [9] ; Lee, H. S. [9, 2] ; Lee, J. [9] ; Lee, J. Y. [13] ; Lee, M. H. [9, 2] ; Lee, S. H. [9, 2] ; Leonard, D. S. [9] ; Lynch, W. A. [8] ; Manzato, B. B. [5] ; Maruyama, R. H. [1] ; Neal, R. J. [8] ; Olsen, S. L. [9] ; Park, H. K. [15] ; Park, H. S. [14] ; Park, K. S. [9] ; Pitta, R. L. C. [5] ; Prihtiadi, H. [7, 9] ; Ra, S. J. [9] ; Rott, C. [16] ; Shin, K. A. [9] ; Scarff, A. [8] ; Spooner, N. J. C. [8] ; Thompson, W. G. [1] ; Yang, L. [17] ; Yu, G. H. [16] ; Collaboration, COSINE-100
Número total de Autores: 51
Afiliação do(s) autor(es):
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[1] Yale Univ, Dept Phys, New Haven, CT 06520 - USA
[2] UST, IBS Sch, Daejeon 34113 - South Korea
[3] Sejong Univ, Dept Phys, Seoul 05006 - South Korea
[4] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6 - Canada
[5] Univ Sao Paulo, Phys Inst, BR-05508090 Sao Paulo - Brazil
[6] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826 - South Korea
[7] Bandung Inst Technol, Dept Phys, Bandung 40132 - Indonesia
[8] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire - England
[9] Inst for Basic Sci Korea, Ctr Underground Phys, Daejeon 34126 - South Korea
[10] Ewha Womans Univ, Dept Sci Educ, Seoul 03760 - South Korea
[11] Univ Wisconsin, Dept Phys, Madison, WI 53706 - USA
[12] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 - USA
[13] Kyungpook Natl Univ, Dept Phys, Daegu 41566 - South Korea
[14] Korea Res Inst Stand & Sci, Daejeon 34113 - South Korea
[15] Korea Univ, Dept Accelerator Sci, Sejong 30019 - South Korea
[16] Sungkyunkwan Univ, Dept Phys, Suwon 16419 - South Korea
[17] Univ Illinois, Dept Phys, Urbana, IL 61801 - USA
Número total de Afiliações: 17
Tipo de documento: Artigo Científico
Fonte: Astroparticle Physics; v. 115, FEB 2020.
Citações Web of Science: 0
Resumo

COSINE-100 is a direct detection dark matter search experiment that uses a 106 kg array of eight NaI(Tl) crystals that are kept underground at the Yangyang Underground Laboratory to avoid cosmogenic activation of radioisotopes by cosmic rays. Even though the cosmogenic activity is declining with time, there are still significant background rates from the remnant nuclides. In this paper, we report measurements of cosmogenic isotope contaminations with less than one year half-lives that are based on extrapolations of the time dependent activities of their characteristic energy peaks to activity rates at the time the crystals were deployed underground. For longer-lived Cd-109 (T-1/2 = 1.27 y) and Na-22 (T-1/2 = 2.6 y), we investigate time correlations and coincidence events due to several emissions. The inferred sea-level production rates are compared with calculations based on the ACTIVIA and MENDL-2 model calculations and experimental data. The results from different approaches are in reasonable agreement with each other. For H-3, which has a long, 12.3 year half-life, we evaluated the activity levels and the exposure times that are in reasonable agreement with the time period estimated for each crystals exposure. (C) 2019 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 17/02952-0 - Procura da matéria escura: WIMPs e fótons escuros
Beneficiário:Nelson Carlin Filho
Modalidade de apoio: Auxílio à Pesquisa - Regular