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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; Eun Ju, Jeon; Jo, J. H.; Woon Gu, Kang; Kauer, M.; Hyoun Gyu, Kim; Kim, H. J.; Sung Hyun, Kim; Kim, S. K.; Won Kyung Kim; Yeongduk Kim; Yong Hamb Kim; Young Ju Ko; Eun Kyoung Lee; Hyunseok Lee; Hyun Su Lee; Hye Young Lee; In Soo Lee; Jaison Lee; Lee, J. Y.; Moo Hyun Lee; 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.; Hafizh Prihtiadi; Se Jin Ra; Rott, C.; Keonah Shin; 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.
- 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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