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Phys. Rev. Lett. 100, 132502 (2008) [4 pages]

QEC Values of the Superallowed β Emitters 50Mn and 54Co

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T. Eronen1,*, V.-V. Elomaa1, U. Hager1,†, J. Hakala1, J. C. Hardy2, A. Jokinen1, A. Kankainen1, I. D. Moore1, H. Penttilä1, S. Rahaman1, S. Rinta-Antila3, J. Rissanen1, A. Saastamoinen1, T. Sonoda1,‡, C. Weber1, and J. Äystö1
1Department of Physics, P.O. Box 35 (YFL), FI-40014 University of Jyväskylä, Finland
2Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
3Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom

See Also: Publisher's Note

Received 20 December 2007; published 2 April 2008; corrected 3 April 2008

Using a new fast cleaning procedure to prepare isomerically pure ion samples, we have measured the beta-decay QEC values of the superallowed β emitters 50Mn and 54Co 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 Vud and improved confirmation of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.132502
DOI:
10.1103/PhysRevLett.100.132502
PACS:
21.10.Dr, 23.40.Bw, 27.40.+z

*tommi.eronen@phys.jyu.fi

†Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada.

‡Present address: RIKEN Atomic Physics Laboratory, 2-1 Hirosawa Wako Saitama 351-0198, Japan.

See Also

Publisher's Note: 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, and J. Aysto, Publisher’s Note: QEC Values of the Superallowed β Emitters 50Mn and 54Co [Phys. Rev. Lett. 100, 132502 (2008)], Phys. Rev. Lett. 100, 149902 (2008).

 
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