Precision QEC-value measurement of 23Mg for testing the Cabibbo-Kobayashi-Maskawa matrix unitarity
Résumé
We report a new direct measurement of the transition energy Q(EC) of the Mg-23 beta(+) decay, using the TITAN Penning-trap mass spectrometer. This value is found to agree with the latest atomic mass evaluation while being four times more precise. The increase in precision changes the uncertainty contribution of the Q(EC) value on the statistical rate function f(v) from 11% to 0.6%, an improvement by a factor of 18. This enables a more robust determination of the corrected Ft value of this mirror transition to the required precision, making possible further test of the Cabibbo-Kobayashi-Maskawa matrix unitarity.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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