Bound Muon Decay-Rate Anomaly

Chilton has suggested that the presence of an unusually large fraction of high-energy $\gamma$ rays in the spectrum emitted following muon capture in nuclei in the region $Z\sim 26$ could account for the anomalous decay rates of muons bound in such nuclei as measured by Yovanovitch. We have examined these spectra and find that the high-energy $\gamma$ rays are not sufficiently abundant to account for the effect observed by Yovanovitch.