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  1. ; ; ; ; ; ; ; ; ; ; et al (, The European Physical Journal C)
    Abstract We report the identification of metastable isomeric states of$$^{228}$$ 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$$\beta $$ β -decay of$$^{228}$$ 228 Ra, a component of the$$^{232}$$ 232 Th decay chain, with$$\beta $$ β Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value of$$^{228}$$ 228 Ra as well as the relative abundance of$$^{232}$$ 232 Th 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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