@article{e6efff279db149028ef835caf6853964,
title = "Identification of new isomers in 228 Ac: impact on dark matter searches",
abstract = "We report the identification of metastable isomeric states of 228Ac 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 β-decay of 228Ra, a component of the 232Th decay chain, with β Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value of 228Ra as well as the relative abundance of 232Th and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.",
author = "{COSINE-100 Collaboration} and Kim, {K. W.} and G. Adhikari and {de Souza}, {E. Barbosa} and N. Carlin and Choi, {J. J.} and S. Choi and M. Djamal and Ezeribe, {A. C.} and Fran{\c c}a, {L. E.} and C. Ha and Hahn, {I. S.} and Jeon, {E. J.} and Jo, {J. H.} and Kang, {W. G.} and M. Kauer and H. Kim and Kim, {H. J.} and Kim, {S. H.} and Kim, {S. K.} and Kim, {W. K.} and Kim, {Y. D.} and Kim, {Y. H.} and Ko, {Y. J.} and Lee, {E. K.} and H. Lee and Lee, {H. S.} and Lee, {H. Y.} and Lee, {I. S.} and J. Lee and Lee, {J. Y.} and Lee, {M. H.} and Lee, {S. H.} and Lee, {S. M.} and Leonard, {D. S.} and Manzato, {B. B.} and Maruyama, {R. H.} and Neal, {R. J.} and Olsen, {S. L.} and Park, {B. J.} and Park, {H. K.} and Park, {H. S.} and Park, {K. S.} and Pitta, {R. L.C.} and H. Prihtiadi and Ra, {S. J.} and C. Rott and Shin, {K. A.} and A. Scarff and Spooner, {N. J.C.} and Thompson, {W. G.}",
note = "Publisher Copyright: {\textcopyright} 2021, The Author(s).",
year = "2021",
month = aug,
doi = "10.1140/epjc/s10052-021-09473-2",
language = "English",
volume = "81",
journal = "European Physical Journal C",
issn = "1434-6044",
publisher = "Springer Nature",
number = "8",
}