A new and model-independent way of analyzing the data on magnetic moments and β decays of mirror nuclei gives firm evidence for a quenching of the axial-vector coupling constant in nuclei. Specifically, R=|CACV|=1.00±0.02 is found, compared with the bare nucleon value R=1.25±0.01. The same analysis yields effective orbital g factors ̃ \~gₚ=0.94±0.05 and ̃ \~gₙ=0.10±0.04 for proton and neutron, values which deviate from the bare values gₚ=1 and gₙ=0 in a direction opposite to that generally accepted.
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Buck et al. (1983) studied this question.