QEC values of the superallowed beta emitters 50Mn and 54Co.

Eronen, T; Elomaa, V-V; Hager, U; Hakala, J; Hardy, J C; Jokinen, A; Kankainen, A; Moore, I D; Penttilä, H; Rahaman, S; Rinta-Antila, S; Rissanen, J; Saastamoinen, A; Sonoda, T; Weber, C; Aystö, J

Eronen, T; Elomaa, V-V; Hager, U; Hakala, J; Hardy, J C; Jokinen, A; Kankainen, A; Moore, I D; Penttilä, H; Rahaman, S; Rinta-Antila, S; Rissanen, J; Saastamoinen, A; Sonoda, T; Weber, C; Aystö, J.

Eronen T; Department of Physics, P.O. Box 35 (YFL), FI-40014 University of Jyväskylä, Finland. tommi.eronen@phys.jyu.fi

Phys Rev Lett ; 100(13): 132502, 2008 Apr 04.

Article en En | MEDLINE | ID: mdl-18517940

ABSTRACT

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 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.

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Banco de datos: MEDLINE Idioma: En Año: 2008 Tipo del documento: Article

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Banco de datos: MEDLINE Idioma: En Año: 2008 Tipo del documento: Article