Identification of new isomers in $^{228}$Ac : Impact on dark matter searches
| Autor: | 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., Joo, H. W., 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. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Eur. Phys. J. C 81 (2021) 746 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epjc/s10052-021-09473-2 |
| Popis: | We report the identification of metastable isomeric states of $^{228}$Ac 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 $^{228}$Ra, a component of the $^{232}$Th decay chain, with $\beta$ Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to its low Q-value as well as the relative abundance of $^{232}$Th and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments. Comment: 9 pages, 9 figures |
| Databáze: | arXiv |
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