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Alpha backgrounds in NaI(Tl) crystals of COSINE-100

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Title
Alpha backgrounds in NaI(Tl) crystals of COSINE-100
Author(s)
Adhikari, G.; Carlin, N.; Cavalcante, D.F.F.S.; Jaeyoung Cho; Jae Jin Choi; Choi, S.; Ezeribe, A.C.; França, L.E.; Ha, C.; Kevin Insik Hahn; Hollick, S.J.; Eun Ju Jeon; Joo, H.W.; Woon Gu Kang; Kauer, M.; Bongho Kim; Kim, H.J.; Kim, J.; Kyungwon Kim; Sung Sung Kim; Kim, S.K.; Sang Sang Kim; W.K. Kim; Yeongduk Kim; Yong Hamb Kim; Young Ju Ko; Lee, D.H.; Eun Kyoung Lee; Hye Jin Lee; Hyun Su Lee; Hye Young Lee; In Su Lee; Jaison Lee; Lee, J.Y.; Moo Hyun Lee; Seunghun Lee; Lee, S.M.; Lee, Y.J.; Douglas Leonard; Luan, N.T.; Manzato, B.B.; Maruyama, R.H.; Neal, R.J.; Nikkel, J.A.; S.L. Olsen; B.J. Park; Park, H.K.; Park, H.S.; Park, J.C.; Kang Soon Park; Park, S.D.; Pitta, R.L.C.; Prihtiadi, H.; Se Jin Ra; Rott, C.; Scarff, A.; Shin, K.A.; Son, M.K.; Spooner, N.J.C.; Truc, L.T.; Yang, L.; Yu, G.H.
Publication Date
2024-06
Journal
Astroparticle Physics, v.158
Publisher
Elsevier B.V.
Abstract
COSINE-100 is a dark matter direct detection experiment with 106 kg NaI(Tl) as the target material. 210Pb and daughter isotopes are a dominant background in the WIMP region of interest and are detected via β decay and α decay. Analysis of the α channel complements the background model as observed in the β/γ channel. We present the measurement of the quenching factors and Monte Carlo simulation results and activity quantification of the α decay components of the COSINE-100 NaI(Tl) crystals. The data strongly indicate that the α decays probabilistically undergo two possible quenching factors but require further investigation. The fitted results are consistent with independent measurements and improve the overall understanding of the COSINE-100 backgrounds. Furthermore, the half-life of 216Po has been measured to be 143.4±1.2 ms, which is consistent with and more precise than most current measurements. © 2024 Elsevier B.V.
URI
https://pr.ibs.re.kr/handle/8788114/15029
DOI
10.1016/j.astropartphys.2024.102945
ISSN
0927-6505
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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