Abstract
A recent experiment at LEAR, the CERN Low Energy Antiproton Ring, has provided very precise differential cross-section data for the p p → n n charge-exchange reaction. Extrapolating the data to the pion pole we have determined the charged-pion coupling constant to be f c 2 = 0.071 ± 0.002 from the data at 601 MeV/ c. Details of the fitting procedure are given, as well as results obtained when applying the same method to recent np → pn data.
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