The photon spectrum from radiative muon capture in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ has been measured using a time projection chamber as a large acceptance pair spectrometer. The integrated partial branching ratio for photons of $E_{\gamma }$>57 MeV, relative to the ordinary muon capture rate, is (2.2±0.2)×${10}^{\mathrm{-}5}$. When compared to a calculation using a phenomenological nuclear response function the data indicate a value for the induced pseudoscalar coupling in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ of $g_p$/$g_a$=7.3±0.9; however, when compared to a microscopic nuclear-model calculation the value $g_p$/$g_a$${=13.6\mathrm{}}_{\mathrm{-}1.9}^{+1.6\mathrm{}}$ is obtained.

• Received 19 January 1989

DOI:https://doi.org/10.1103/PhysRevC.40.R1100