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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-emitters50Mn and 54Co to be 7634.48(7) keV and 8244.54(10) keV, respectively, resultswhich differ significantly from the previously accepted values. The correctedFt values derived from our results strongly support newisospin-symmetry-breaking corrections that lead to a higher value of theup-down quark mixing element, Vud, and improved confirmation of the unitarityof the Cabibbo-Kobayashi-Maskawa matrix.

Q_EC values of the Superallowed beta Emitters 50Mn and 54Co