Evidence for Higher-Order Processes in Single-Nucleon Transfer Reactions

Anomalies in the shapes of angular distributions with respect to predictions of the distorted-wave Born approximation for several weak transitions in the reactions ${}_{}{}^{172}{}_{}{}^{}\mathrm{Yb}\mathrm{}(p,d)\mathrm{}$ and ${}_{}{}^{186}{}_{}{}^{}\mathrm{W}\mathrm{}(p,d)\mathrm{}$ are interpreted as resulting from inelastic excitations in the entrance and exit channels. These anomalies are shown to be reproduced when the reactions are treated within the coupled-channel Born approximation.