An exact determination of the size of the pseudospin symmetry-violating part of the nucleon-nucleus scattering amplitude from scattering observables is presented. The approximation recently used by Ginocchio turns out to underestimate the violation of pseudospin symmetry. Nevertheless the conclusion of a modestly broken pseudospin symmetry in proton-${}^{208}\mathrm{Pb}$ scattering at $E_L=800\mathrm{}$ MeV remains valid.

• Received 23 February 2000

DOI:https://doi.org/10.1103/PhysRevC.62.024602