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Kyungwon, Kim
지하실험 연구단
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Identification of new isomers in Ac-228: impact on dark matter searches

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Title
Identification of new isomers in Ac-228: impact on dark matter searches
Author(s)
Kyungwon, Kim; Adhikari, G.; de Souza, E. Barbosa; Carlin, N.; Choi, J. J.; Choi, S.; Djamal, M.; Ezeribe, A. C.; Franca, L. E.; Ha, C.; Kevin Insik, Hahn; Jeon, Eun Ju; Jo, J. H.; Woon Gu, Kang; Kauer, M.; Hyoun Gyu, Kim; Kim, H. J.; Sung Sung, Kim; Kim, S. K.; Won Kyung Kim; Kim, Yeongduk; Kim, Yong Hamb; Ko, Young Ju; Lee, Eun Kyoung; Hyunseok Lee; Lee, Hyun Su; Lee, Hye Young; Lee, In Soo; Lee,, Jaison; Lee, J. Y.; Lee, Moo Hyun; Seo Hyun Lee; Lee, S. M.; Douglas, Leonard; Manzato, B. B.; Maruyama, R. H.; Neal, R. J.; Stephen Lars Olsen; Byung Ju Park; Park, H. K.; Park, H. S.; Kang Soon, Park; Pitta, R. L. C.; Prihtiadi, Hafizh; Se Jin, Ra; Rott, C.; Shin, Keonah; Scarff, A.; Spooner, N. J. C.; Thompson, W. G.; Yang, L.; Yu, G. H.
Publication Date
2021-08
Journal
European Physical Journal C, v.81, no.8
Publisher
Springer Verlag
Abstract
© The Author(s) 2021. We report the identification of metastable isomeric states of Ac-228 at 6.28 keV, 6.67 keV and 20.19 keV, with lifetimes of an order of 100 ns. These states are produced by the beta-decay of Ra-228, a component of the Th-232 decay chain, with beta Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value of Ra-228 as well as the relative abundance of Th-232 and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.
URI
https://pr.ibs.re.kr/handle/8788114/10344
DOI
10.1140/epjc/s10052-021-09473-2
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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