0−↔0+beta decay and muon capture in theA=16nuclei

The muon-capture process ${\mu }^{-}+{}_{}{}^{16}{}_{}{}^{}\mathrm{O}\left(0^{+}\right)\to {}_{}{}^{16}{}_{}{}^{}\mathrm{N}_{}^{*}{}_{}{}^{}+{\nu }_{\mu }$ and the $\beta$ decay ${}_{}{}^{16}{}_{}{}^{}\mathrm{N}_{}^{*}{}_{}{}^{}\left(0^{-}\right)\to {}_{}{}^{16}{}_{}{}^{}\mathrm{O}\left(0^{+}\right)+e^{-}+{\overline{\nu }}_e$ are analyzed in the elementary particle treatment. Theoretical results are shown to be consistent with experiment and do not support any necessity of a significant upward renormalization of the nucleon form factor $g_P$ in nuclei as suggested by a previous analysis by Palffy etal. Slight downward renormalization of $g_P$ is consistent with experimental data.