A significant improvement has been made in the identification of $\gamma$ rays from muon capture in I, Au, and Bi, all monisotopic elements. The (${\mu }^{-},\nu n$) reaction was clearly observed in all nuclei, but the levels excited do not correlate well with the spectroscopic factors from the ($d,{}^3\mathrm{He}$) reaction. Some (${\mu }^{-},\nu 2n$), (${\mu }^{-},\nu 3n$), (${\mu }^{-},\nu 4n$), (${\mu }^{-},\nu 5n$) and other reactions have been observed at a lower yield. The muonic x-ray cascades have also been studied in detail.

• Received 5 December 2006

DOI:https://doi.org/10.1103/PhysRevC.75.045501