Q-values of the Superallowed beta-Emitters 26m-Al, 42-Sc and 46-V and their impact on V_ud and the Unitarity of the CKM Matrix

T. Eronen; J. C. Hardy; V. Elomaa; U. Hager; J. Hakala; A. Jokinen; A. Kankainen; V. S. Kolhinen; I. Moore; H. Penttila; S. Rahaman; J. Rissanen; A. Saastamoinen; T. Sonoda; J. Aysto

doi:10.1103/physrevlett.97.232501

arXiv · nucl-ex/0606035

Q-values of the Superallowed beta-Emitters 26m-Al, 42-Sc and 46-V and their impact on V_ud and the Unitarity of the CKM Matrix

T. Eronen·J. C. Hardy·V. Elomaa·U. Hager·J. Hakala·A. Jokinen·A. Kankainen·V. S. Kolhinen·I. Moore·H. Penttila·S. Rahaman·J. Rissanen·A. Saastamoinen·T. Sonoda·J. Aysto

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Abstract

The beta-decay Q_EC-values of the superallowed beta emitters 26m-Al, 42-Sc and 46-V have been measured with a Penning trap to a relative precision of better than 8x10^-9. Our result for 46-V, 7052.72(31) keV, confirms a recent measurement that differed significantly from the previously accepted reaction-based Q_EC-value. However, our results for 26m-Al and 42-Sc, 4232.83(13) keV and 6426.13(21) keV, are consistent with previous reaction-based values. By eliminating the possibility of a systematic difference between the two techniques, this result demonstrates that no significant shift in the deduced value of V_ud should be anticipated.

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T. Eronen, J. C. Hardy, V. Elomaa, U. Hager, J. Hakala, A. Jokinen, A. Kankainen, V. S. Kolhinen, I. Moore, H. Penttila, S. Rahaman, J. Rissanen, A. Saastamoinen, T. Sonoda, J. Aysto. 2006-06-27. Q-values of the Superallowed beta-Emitters 26m-Al, 42-Sc and 46-V and their impact on V_ud and the Unitarity of the CKM Matrix. https://doi.org/10.1103/physrevlett.97.232501

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