Values found for 30-Mev scattering at the two center-of-mass angles 116.8^∘{} and 155^∘{} are, respectively, for positive pions 0.849±{}0.048 and 1.098±{}0.075 mb sterad^-1, and for negative pions of the same energy 0.187±{}0.020 and 0.165±{}0.022 mb sterad^-1. Phase-shift analyses are made of recent published π^- distributions in the above energy range and serve to furnish prescriptions for the low-energy behavior of the T=1/2 phases. Calculations of σ^--, σ^-0, and σₜₒₜₐₗ^- at various energies agree with measurements found in the literature. An essential agreement is found between π^-+p forward scattering amplitudes and a dispersion equation over this energy region.
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Barnes et al. (1960) studied this question.
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