QEC values of the superallowed beta emitters 50Mn and 54Co. Academic Article uri icon


  • 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 5(0)Mn and (54)Co to be 7634.48(7) 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 V(ud) and improved confirmation of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Eronen, T., Elomaa, V., Hager, U., Hakala, J., Hardy, J. C., Jokinen, A., ... Ayst, J.

citation count

  • 70

complete list of authors

  • Eronen, T||Elomaa, V-V||Hager, U||Hakala, J||Hardy, JC||Jokinen, A||Kankainen, A||Moore, ID||Penttilä, H||Rahaman, S||Rinta-Antila, S||Rissanen, J||Saastamoinen, A||Sonoda, T||Weber, C||Aystö, J

publication date

  • April 2008