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High-energy π^±p backward elastic-scattering data are analyzed in terms of N_α and Δ_δ Regge exchanges. Using the signs of the Regge residues found from extrapolations to the particle poles (which agree with the signs obtained from interference with direct-channel resonances), we predict the π^-p→π⁰n cross section near 180^∘{}.
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Barger et al. (1967) studied this question.
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