Abstract
From an analysis of charge exchange and elastic scattering of 35 MeV negative pions using a liquid hydrogen bubble chamber, the charge-exchange total cross section is found to be 5.61 ± 0.40 mbn and the s-wave scattering lengths a1 = +0.187 ± 0.009 a3 = -0.082 ± 0 011 in units of = c = mπ = 1. The quantity a1 - a3 is found by a method free from systematic error and independent of Coulomb corrections. It is compared with that of the analysis of pion-proton scattering data, using dispersion relations, by Hamilton and Woolcock. The agreement is reasonable.
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