γ rays from muon capture in natural Ca, Fe, and Ni

A significant improvement has been made in the identification of γ rays from muon capture in natural Ca, and to a lesser extent for Fe and Ni. For calcium, capture was observed in 44Ca and even 42Ca, as well as the dominant 40Ca. The (μ-,ν) reaction was clearly observed in 40Ca, but, as in the past, no clear identification was made in Fe and Ni. The (μ-,νn) reaction was clearly observed in all nuclei, and the γ rays observed correspond better to the (γ,p) reaction than to spectroscopic factors from the (d,3He) or (t,α) reactions. Some (μ-,ν2n) and other reactions have been observed at a lower yield