Elastic scattering of 60-Mev $\pi$-mesons on carbon is analyzed to determine the following qualitative features of elementary $\pi$-nucleon scattering at this energy: $p$-wave scattering is predominant, with some $s$-wave interference at a relative phase that favors backscattering. The rather crude interpretation does not indicate $d$-wave scattering. Spin flip scattering is essentially absent from the ${\mathrm{C}}^{12}$ scattering. The Coulomb interference provides an absolute calibration, from which it is inferred that the $p$-wave "resonance" energy lies above 60 Mev.

• Received 22 May 1952

DOI:https://doi.org/10.1103/PhysRev.87.862