Using the short pulses of a linac a measurement has been performed of partial ${\mu }^{-}$-capture rates in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ leading to the ${\mathrm{O}}^{-}$ and $1^{-}$ bound excited states of ${}_{}{}^{16}{}_{}{}^{}\mathrm{N}$. The experimental ${\mathrm{O}}^{+}$→${\mathrm{O}}^{-}$ transition rate supports the assumption of a large mesonic exchange effect in the time part of the weak axial current.

NUCLEAR REACTIONS Muon capture ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($\mu$,$\nu$)${}_{}{}^{16}{}_{}{}^{}\mathrm{N}$. Measured $I_{\gamma }$, Ge(Li) detector. Deduced partial capture rates. Mesonic exchange correction to capture rate calculations.

• Received 12 July 1978

DOI:https://doi.org/10.1103/PhysRevC.19.987