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Identification of new isomers in Ac-228: impact on dark matter searches
- Title
- Identification of new isomers in Ac-228: impact on dark matter searches
- Authors
- Kim, K. W.; Adhikari, G.; de Souza, E. Barbosa; Carlin, N.; Choi, J. J.; Choi, S.; Djamal, M.; Ezeribe, A. C.; Franca, L. E.; Ha, C.; Hahn, I. S.; Jeon, E. J.; Jo, J. H.; Kang, W. G.; Kauer, M.; Kim, H.; Kim, H. J.; Kim, S. H.; Kim, S. K.; Kim, W. K.; Kim, Y. D.; Kim, Y. H.; Ko, Y. J.; 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.; Leonard, D. S.; Manzato, B. B.; Maruyama, R. H.; Neal, R. J.; Olsen, S. L.; Park, B. J.; Park, H. K.; Park, H. S.; Park, K. S.; Pitta, R. L. C.; Prihtiadi, H.; Ra, S. J.; Rott, C.; Shin, K. A.; Scarff, A.; Spooner, N. J. C.; Thompson, W. G.; Yang, L.; Yu, G. H.|COSINE-100 Collaboration
- Ewha Authors
- 한인식
- SCOPUS Author ID
- 한인식
- Issue Date
- 2021
- Journal Title
- EUROPEAN PHYSICAL JOURNAL C
- ISSN
- 1434-6044
1434-6052
- Citation
- EUROPEAN PHYSICAL JOURNAL C vol. 81, no. 8
- Publisher
- SPRINGER
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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.
- DOI
- 10.1140/epjc/s10052-021-09473-2
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
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