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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

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arxiv nucl-ex/0606035 v1 pith:UZ7FW77M submitted 2006-06-27 nucl-ex

T. Eronen , J. C. Hardy , V. Elomaa , U. Hager , J. Hakala , A. Jokinen , A. Kankainen , V. S. Kolhinen
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I. Moore H. Penttila S. Rahaman J. Rissanen A. Saastamoinen T. Sonoda J. Aysto
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keywords m-alreaction-basedresultsuperallowedacceptedanticipatedbeenbeta
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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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