期刊
PHYSICAL REVIEW LETTERS
卷 100, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.132502
关键词
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Using a new fast cleaning procedure to prepare isomerically pure ion samples, we have measured the beta-decay Q(EC) values of the superallowed beta emitters Mn-50 and Co-54 to be 7634.48(7) and 8244.54(10) keV, respectively, results which differ significantly from the previously accepted values. The corrected Ft values derived from our results strongly support new isospin-symmetry-breaking corrections that lead to a higher value of the up-down quark mixing element V-ud and improved confirmation of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.
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