Q_EC values of the Superallowed beta Emitters 50Mn and 54Co
T. Eronen, V.-V. Elomaa, U. Hager, J. Hakala, J. C. Hardy, A. Jokinen,, A. Kankainen, I. D. Moore, H. Penttila, S. Rahaman, S. Rinta-Antila, J., Rissanen, A. Saastamoinen, T. Sonoda, C. Weber, J. Aysto
TL;DR
This study precisely measures the beta-decay Q_EC values of 50Mn and 54Co using a novel sample preparation method, providing results that support revised isospin-symmetry corrections and a more accurate Vud, reinforcing CKM matrix unitarity.
Contribution
Introduces a new fast cleaning procedure for pure ion samples and provides revised Q_EC values that impact fundamental tests of the Standard Model.
Findings
Revised Q_EC values differ significantly from previous data.
Results support higher Vud value and CKM matrix unitarity.
Enhanced understanding of isospin-symmetry-breaking corrections.
Abstract
Using a new fast cleaning procedure to prepare isomerically pure ion samples, we have measured the beta-decay Q_EC values of the superallowed beta-emitters 50Mn and 54Co to be 7634.48(7) keV and 8244.54(10) keV, respectively, results which differ significantly from the previously accepted values. The corrected Ft values derived from our results strongly support new isospin-symmetry-breaking corrections that lead to a higher value of the up-down quark mixing element, Vud, and improved confirmation of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.
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