Abstract

Processes involving two vertices are analyzed in nuclear physics. By means of an appropriate isospin analysis, corrections to the usual single-particle Hamiltonian arising from nuclear correlations are explicitely given for Compton scattering and muon and pion radiative capture. In particular the $\ensuremath{\Delta}T=2$ channel is seen to play a fundamental role in radiative muon capture for medium and heavy nuclei where its contribution to the rate amounts to \ensuremath{\sim}10% for $^{40}\mathrm{Ca}$ and affects sensitively the estimates of ${g}_{p}$.

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