Identification of new isomers in Ac-228: impact on dark matter searches

  • Kim, K. W.
  • Adhikari, G.
  • de Souza, E. Barbosa
  • Carlin, N.
  • Choi, J. J.
  • ... Park, H. K.
  • 외 46명
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초록

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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CRYSTALSDECAY
제목
Identification of new isomers in Ac-228: impact on dark matter searches
저자
Kim, K. W.Adhikari, G.de Souza, E. BarbosaCarlin, 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.
DOI
10.1140/epjc/s10052-021-09473-2
발행일
2021-08
유형
Article
저널명
European Physical Journal C
81
8