2P-]1S PIONIC TRANSITION

In an attempt to get better agreement between the theoretical predictions and the observed energies and widths of 2p→1s pion-atomic transitions, we have numerically integrated the Klein-Gordon equation assuming the optical model for the strong interaction potential. We have characterized the interaction by six s-wave and four p-wave parameters. Using the available data from B10 to Mg24, we have performed a least-squares fit of the s-wave parameters. We find agreement between the observed shifts and our predictions, and the real parts of the s-wave parameters agree well with those predicted by Ericson and Ericson. However, our predicted widths vary as much as 50% from the observed widths and we find very poor agreement between the imaginary s-wave parameters and Ericson and Ericson's predictions. © 1969 The American Physical Society.