Bar-shape and eigenshape parameters from the zero-energy wave functions

It is shown that the Biedenharn-Blatt formula for the shape parameter for the coupled-channel case as an integral involving the zero-energy wave function actually gives the bar-shape parameter Pb and not the eigenshape parameter Pe as stated by the authors. We show that the zero-energy bar-wave functions and the zero-energy eigenwave functions are identical, and thus we obtain, by two different methods, the formula Pb-Pe=q2/(atr03), where at is …