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Identification of new isomers in $^{228}$Ac : Impact on dark matter searches

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arxiv 2103.02809 v3 pith:PWVGVM2H submitted 2021-03-04 hep-ex nucl-ex

K. W. Kim , G. Adhikari , E. Barbosa de Souza , N. Carlin , J. J. Choi , S. Choi , M. Djamal , A. C. Ezeribe
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L. E. Franca C. Ha I. S. Hahn E. J. Jeon J. H. Jo H. W. Joo W. G. Kang M. Kauer H. Kim H. J. Kim S. H. Kim S. K. Kim W. K. Kim Y. D. Kim Y. H. Kim Y. J. Ko 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. Lee D. S. Leonard B. B. Manzato R. H. Maruyama R. J. Neal S. L. Olsen B. J. Park H. K. Park H. S. Park K. S. Park R. L. C. Pitta H. Prihtiadi S. J. Ra C. Rott K. A. Shin A. Scarff N. J. C. Spooner W. G. Thompson L. Yang G. H. Yu
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classification hep-exnucl-ex
keywords backgroundbetadarkdecayexperimentsidentificationimpactmatter
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abstract

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.

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