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Identification of new isomers in Ac-228: impact on dark matter searches
- Authors
- Kim, K.W.; Adhikari, G.; Barbosa de Souza, E.; 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.
- Issue Date
- Aug-2021
- Publisher
- SPRINGER
- Citation
- EUROPEAN PHYSICAL JOURNAL C, v.81, no.8
- Journal Title
- EUROPEAN PHYSICAL JOURNAL C
- Volume
- 81
- Number
- 8
- ISSN
- 1434-6044
1434-6052
- 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.
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