Pion-Proton Scattering at 150 and 170 Mev

The pion-proton differential scattering cross sections have been measured at 150 and 170 Mev. Measurements were made at eight angles using scintillation counters and a liquid hydrogen target. Statistical errors are of the order 5 percent or less. Phase shift analyses of the data have been made on the assumption that the total isotopic spin is conserved and that only $s$ and $p$ waves are appreciably scattered. The angular distributions give no positive indication of any $d$-wave scattering.