Abstract
The contributions from two-body exchange current and wave function renormalization are shown to cancel each other in the soft-pion limit using generalized Ward-Takahashi relations. For conserved vector current, the cancellation is complete; for partially conserved axial-vector current, the cancellation is partial with the remainder related to the pion-bremsstrahlung process in nucleon-nucleon scattering. The implications of the results for the weak decay processes in finite nuclei are discussed.
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