Recent ${\pi }^{\pm }$ scattering data at 20 and 30 MeV are analyzed semiphenomenologically and phenomenologically. Although the present method of extrapolation from pionic atoms to scattering is not entirely satisfactory, the scattering data presently available appear to show effects of the pionic atom anomaly.

• Received 19 January 1988

DOI:https://doi.org/10.1103/PhysRevC.38.867