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- W4309590047 abstract "Potassium-40 is a widespread, naturally-occurring isotope whose radioactivity impacts subatomic rare-event searches, nuclear structure theory, and estimated geological ages. A predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The KDK (potassium decay) collaboration reports the first, successful observation of this rare decay mode. A blinded analysis reveals a non-zero ratio of intensities of ground-state electron-captures ($I_{text{EC}^0}$) over excited-state ones ($I_text{EC*}$) of $ I_{text{EC}^0} / I_text{EC*} = 0.0095 stackrel{text{stat}}{pm} 0.0022 stackrel{text{sys}}{pm} 0.0010 $ (68% CL), with the null hypothesis rejected at 4$sigma$. In terms of branching ratio, this signal yields $I_{text{EC}^0} = 0.098% stackrel{text{stat}}{pm} 0.023% stackrel{text{sys}}{pm} 0.010% $, roughly half of the commonly used prediction, with consequences for various fields." @default.
- W4309590047 created "2022-11-28" @default.
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- W4309590047 date "2022-11-18" @default.
- W4309590047 modified "2023-09-27" @default.
- W4309590047 title "Rare $^{40}$K decay with implications for fundamental physics and geochronology" @default.
- W4309590047 doi "https://doi.org/10.48550/arxiv.2211.10319" @default.
- W4309590047 hasPublicationYear "2022" @default.
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