$Q$ Values of the Superallowed $β$ Emitters ${}^{26}{Al}^{m}$ , ${}^{42}{Sc}$ , and ${}^{46}V$ and Their Impact on $V_{u d}$ and the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix

8 December 2006

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 97 (23) , 232501
https://doi.org/10.1103/physrevlett.97.232501

Abstract

The

β

-decay

Q_{EC}

values of the superallowed beta emitters

{}^{26}{Al}^{m}

{}^{42}{Sc}

, and

{}^{46}V

have been measured with a Penning trap to a relative precision of better than

8 \times 10^{- 9}

. Our result for

{}^{46}V

, 7052.72(31) keV, confirms a recent measurement that differed from the previously accepted reaction-based

Q_{EC}

value. However, our results for

{}^{26}{Al}^{m}

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_{u d}

should be anticipated.

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Version 1, 2006-06-27, ArXiv

This publication has 15 references indexed in Scilit:

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$Q$ Value of the Superallowed Decay of ${}^{46}V$ and Its Influence on $V_{u d}$ and the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix
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QValues of the SuperallowedβEmittersAlm26,Sc42, andV46and Their Impact onVudand the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix

Abstract

Keywords

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$Q$ Values of the Superallowed $β$ Emitters ${}^{26}{Al}^{m}$ , ${}^{42}{Sc}$ , and ${}^{46}V$ and Their Impact on $V_{u d}$ and the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix