Abstract
Abstract Data on superallowed Fermi beta decay are analyzed using recent developments in our understanding of radiative corrections and using a novel largely-empirical approach to the nuclear mismatch correction. The resultant value for the operational vector coupling constant G1v is: G′ v /( h 3 = (1.1510±0.0005) × 10 −5 GeV −2 . The test for the unitarity of the first row of the Kobayashi-Maskawa matrix gives: |Vud|2 + |Vus|2 + |Vud|2 = 0.9989±0.0012.
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