ft value of O14 and the universal Fermi interaction

The experimentally observed near equality of the coupling constants in the nuclear beta-decay and in muon decay has suggested the attractive idea that all of the "weak interactions" proceed by a universal Fermi interaction.(1) The fact that the coupling constant in nuclear beta-decay is not considerably decreased by virtue of the neutron or proton existing part of the time as a proton or neutron plus pion cloud finds an elegant explanation in the conserved vector current hypothesis of Feynman and Gell-Mann.(1,2)