6533b839fe1ef96bd12a6327
RESEARCH PRODUCT
QValues of the SuperallowedβEmittersAlm26,Sc42, andV46and Their Impact onVudand the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix
V.-v. ElomaaAri JokinenT. SonodaUlrike HagerJuho RissanenJ.c. HardyV. S. KolhinenTommi EronenJani HakalaJuha ÄYstöAntti SaastamoinenIain MooreAnu KankainenSaidur RahamanHeikki Penttiläsubject
PhysicsParticle physicsSystematic differenceUnitarity010308 nuclear & particles physicsCabibbo–Kobayashi–Maskawa matrix0103 physical sciencesGeneral Physics and AstronomyBeta (velocity)Relative precisionAtomic physics010306 general physics01 natural sciencesdescription
The $\ensuremath{\beta}$-decay ${Q}_{\mathrm{EC}}$ values of the superallowed beta emitters $^{26}\mathrm{Al}^{m}$, $^{42}\mathrm{Sc}$, and $^{46}\mathrm{V}$ have been measured with a Penning trap to a relative precision of better than $8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$. Our result for $^{46}\mathrm{V}$, 7052.72(31) keV, confirms a recent measurement that differed from the previously accepted reaction-based ${Q}_{\mathrm{EC}}$ value. However, our results for $^{26}\mathrm{Al}^{m}$ and $^{42}\mathrm{Sc}$, 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-12-08 | Physical Review Letters |