Higher-order effects in the allowed beta decay of F20
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It has been proposed by Gell-Mann(1) that the usual vector interaction in beta decay should be modified by addition of a small correction term due to the effect of virtual meson currents around the nucleons. This term in proportional to the difference of the anomalous magnetic moments of protons and neutrons and is of the order of 0.1% per Mev beta energy.