Photon Spectrum from RadiativeμCapture in Calcium

We have measured the high-energy end of the $\gamma$-ray spectrum from radiative muon capture in calcium. This accounted for only about one half of the neutral events detected beyond 57 MeV, the rest apparently being due to neutrons emitted by nuclei after capture. By fitting a theoretical prediction of the photon spectrum to our data, we found a value for the induced pseudoscalar coupling constant which disagrees with that expected.