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- W4385428504 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 strong evidence of this rare decay mode. A blinded analysis reveals a nonzero ratio of intensities of ground-state electron-captures (IEC0) over excited-state ones (IEC*) of IEC0/IEC*=0.0095±stat0.0022±sys0.0010 (68% C.L.), with the null hypothesis rejected at 4σ. In terms of branching ratio, this signal yields IEC0=0.098%±stat0.023%±sys0.010%, roughly half of the commonly used prediction, with consequences for various fields [L. Hariasz et al., companion paper, Phys. Rev. C 108, 014327 (2023)].Received 22 November 2022Revised 9 May 2023Accepted 19 May 2023DOI:https://doi.org/10.1103/PhysRevLett.131.052503© 2023 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBeta decayGeophysicsNeutrinoless double beta decayParticle dark matterProperties39 ≤ A ≤ 58TechniquesNuclear structure & decaysRadiation detectorsShell modelNuclear Physics" @default.
- W4385428504 created "2023-08-01" @default.
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- W4385428504 date "2023-07-31" @default.
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- W4385428504 title "Rare <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>K</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>40</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> Decay with Implications for Fundamental Physics and Geochronology" @default.
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- W4385428504 doi "https://doi.org/10.1103/physrevlett.131.052503" @default.
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