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A phase-shift analysis of the scattering of negative pions on hydrogen in the energy range 120 to 217 Mev is presented. The usual assumptions that the scattering is charge-independent and that scattering in S and P states only is important are made and in addition the P-wave phase shifts of isotopic spin assumed to be zero. Of many approximate solutions obtained a solution showing a resonance in the P state of ordinary spin 32 and isotopic spin 32 in the neighborhood of 195 Mev is considered to have the highest probability of being correct.
Ronald L. Martin (Wed,) studied this question.