Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 81, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-021-09473-2
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Funding
- Institute for Basic Science (IBS), Republic of Korea [IBS-R016-A1, NRF-2016R1A2B3008343]
- NSF [PHY-1913742, DGE-1122492]
- WIPAC
- Wisconsin Alumni Research Foundation, United States
- STFC Grant, United Kingdom [ST/N000277/1, ST/K001337/1]
- FAPESP, Brazil [2017/02952-0]
- CAPES, Brazil [001]
- CNPq, Brazil [131152/2020-3]
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The identification of metastable isomeric states of Ac-228 within the Th-232 decay chain has potential implications for low-energy background modeling in dark matter search experiments.
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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