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

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

2007-12-20

arxiv.org/abs/0712.3463v1

Phys.Rev.Lett.100:132502,2008; Erratum-ibid.100:149902,2008

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 5 figures, 1 table, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.132502 1

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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