Alpha backgrounds in NaI(Tl) crystals of COSINE-100
- Authors
- Adhikari, G.; Carlin, N.; Cavalcante, D.F.F.S.; Cho, J.Y.; Choi, J.J.; Choi, S.; Ezeribe, A.C.; França, L.E.; Ha, C.; Hahn, I.S.; Hollick, S.J.; Jeon, E.J.; Joo, H.W.; Kang, W.G.; Kauer, M.; Kim, B.H.; Kim, H.J.; Kim, J.; Kim, K.W.; Kim, S.H.; Kim, S.K.; Kim, S.W.; Kim, W.K.; Kim, Y.D.; Kim, Y.H.; Ko, Y.J.; Lee, D.H.; 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.; Lee, Y.J.; Leonard, D.S.; Luan, N.T.; Manzato, B.B.; Maruyama, R.H.; Neal, R.J.; Nikkel, J.A.; Olsen, S.L.; Park, B.J.; Park, H.K.; Park, H.S.; Park, J.C.; Park, K.S.; Park, S.D.; Pitta, R.L.C.; Prihtiadi, H.; Ra, S.J.; Rott, C.; Scarff, A.; Shin, K.A.; Son, M.K.; Spooner, N.J.C.; Truc, L.T.; Yang, L.; Yu, G.H.
- Issue Date
- Jun-2024
- Publisher
- Elsevier B.V.
- Keywords
- <sup>210</sup>Pb; <sup>210</sup>Po; <sup>216</sup>Po; <sup>232</sup>Th; Alpha; Half-life; NaI(Tl); Quenching
- Citation
- Astroparticle Physics, v.158
- Indexed
- SCIE
SCOPUS
- Journal Title
- Astroparticle Physics
- Volume
- 158
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/110309
- DOI
- 10.1016/j.astropartphys.2024.102945
- ISSN
- 0927-6505
1873-2852
- 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.
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