Precision QEC-value measurement of 23Mg for testing the 
Cabibbo-Kobayashi-Maskawa matrix unitarity

Schultz, B.E.; Brodeur, M.; Andreoiu, C.; Bader, A.; Chaudhuri, A.; Chowdhury, U.; Gallant, A.T.; Grossheim, A.; Kwiatkowski, A.A.; Klawitter, Renee; Leach, K.G.; Lennarz, A.; Macdonald, T.D.; Lassen, J.; Heggen, H.; Raeder, S.; Teigelhöfer, A.; Dilling, J.

doi:10.1103/PhysRevC.90.012501

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Precision Q_EC-value measurement of ²³Mg for testing the Cabibbo-Kobayashi-Maskawa matrix unitarity

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Klawitter, Renee
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevC.90.012501
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Citation

Schultz, B., Brodeur, M., Andreoiu, C., Bader, A., Chaudhuri, A., Chowdhury, U., et al. (2014). Precision Q_EC-value measurement of ²³Mg for testing the Cabibbo-Kobayashi-Maskawa matrix unitarity. Physical Review C, 90(1): 012501(R). doi:10.1103/PhysRevC.90.012501.

Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-0EAB-7

Abstract

We report a new direct measurement of the transition energy Q_EC of the Mg²³ β⁺ 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 fv 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.