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The annihilation fractions and cross sections for the np annihilation reaction in flight (~50-400 MeV/c) into ηπ + and η'π + final states have been measured. The first ones follow the trend expected for P wave annihilations. From the ratios of the yields an evaluation of the pseudoscalar mixing angle in the standard form is possible. The value found shows that for pseudoscalar meson...
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