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

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Title
Study of cosmogenic radionuclides in the COSINE-100 NaI(Tl) detectors
Author(s)
Barbosa de Souza E.; Park B.J.; Adhikari G.; Adhikari P.; Carlin N.; Choi J.J.; Choi S.; Djamal M.; Ezeribe A.C.; Chang Hyon Ha; Hahn I.S.; Eun Ju Jeon; Jo J.H.; Woon Gu Kang; Kauer M.; Kim G.S.; H. Kim; Kim H.J.; Kyungwon Kim; Nam Young Kim; Kim S.K.; Yeongduk Kim; Yong Hamb Kim; Young Ju Ko; Kudryavtsev V.A.; E.K. Lee; Hyun Su Lee; Jaison Lee; Lee J.Y.; Moo Hyun Lee; Lee, Sunghoon; Leonard Douglas; Lynch W.A.; Manzato B.B.; Maruyama R.H.; Neal R.J.; S.L. Olsen; Park H.K.; Park H.S.; Kang Soon Park; Pitta R.L.C.; Prihtiadi Hafizh; S.J. Ra; Rott C.; Keonah Shin; Scarff A.; Spooner N.J.C.; Thompson W.G.; Yang L.; Yu G.H.
Publication Date
2020-02
Journal
ASTROPARTICLE PHYSICS, v.115, no., pp.UNSP102390 -
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2019 Elsevier B.V.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 109Cd (T1/2=1.27 y) and 22Na (T1/2=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 3H, 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 crystal's exposure
URI
https://pr.ibs.re.kr/handle/8788114/6676
ISSN
0927-6505
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > Journal Papers (저널논문)
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