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Nonproportionality of NaI(Tl) scintillation detector for dark matter search experiments

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Title
Nonproportionality of NaI(Tl) scintillation detector for dark matter search experiments
Author(s)
Lee, S.M.; Adhikari, G.; Carlin, N.; J.Y. Cho; Jae Jin Choi; Choi, S.; Ezeribe, A.C.; Franca, 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 Hyun Kim; Kim, S.K.; Sang Woo, 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 Soo Lee; Jaison Lee; Lee, J.Y.; Moo Hyun Lee; Seunghun Lee; Lee, Y.J.; Douglas Leonard; Luan, N.T.; Manzato, B.B.; Maruyama, R.H.; Neal, R.J.; Nikkel, J.A.; S.L. Olsen; Byungju 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.; Keonah Shin; Cavalcante, D.F.F.S.; Scarff, A.; Son, M.K.; Spooner, N.J.C.; Truc, L.T.; Yang, L.; Gyunho Yu
Publication Date
2024-05
Journal
European Physical Journal C, v.84, no.5
Publisher
Springer Verlag
Abstract
We present a comprehensive study of the nonproportionality of NaI(Tl) scintillation detectors within the context of dark matter search experiments. Our investigation, which integrates COSINE-100 data with supplementary γ spectroscopy, measures light yields across diverse energy levels from full-energy γ peaks produced by the decays of various isotopes. These γ peaks of interest were produced by decays supported by both long and short-lived isotopes. Analyzing peaks from decays supported only by short-lived isotopes presented a unique challenge due to their limited statistics and overlapping energies, which was overcome by long-term data collection and a time-dependent analysis. A key achievement is the direct measurement of the 0.87 keV light yield, resulting from the cascade following electron capture decay of 22Na from internal contamination. This measurement, previously accessible only indirectly, deepens our understanding of NaI(Tl) scintillator behavior in the region of interest for dark matter searches. This study holds substantial implications for background modeling and the interpretation of dark matter signals in NaI(Tl) experiments. © The Author(s) 2024.
URI
https://pr.ibs.re.kr/handle/8788114/15258
DOI
10.1140/epjc/s10052-024-12770-1
ISSN
1434-6044
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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