It is shown that, contrary to a recent suggestion, pion-nucleus scattering is not likely to distinguish among different $\pi -N$ phase shift sets which are in agreement with the $\pi -N$ data.

NUCLEAR REACTIONS Calculated ${\pi }^{-}$-${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ elastic scattering, effects of $\pi -N$ phase shift sets.

• Received 14 January 1981

DOI:https://doi.org/10.1103/PhysRevC.24.1812