Several sets of energy-dependent pion-nucleon phase shifts have been obtained in the 0-350-MeV energy range. These solutions differ near the end of the energy range and in the signs and magnitudes of some of the small phases. There is very little difference among these solutions in their prediction of the observables, including the spin-rotation parameters. Some very difficult experiments are suggested to distinguish among the solutions.

• Received 15 January 1965

DOI:https://doi.org/10.1103/PhysRev.138.B921