The PSI np data and their effect on the charge Pi-N-N coupling constant

Differential cross sections of elastic neutron-proton scattering have been measured for the energy range from 200 MeV to 580 MeV. The angular interval for the detection of the recoiling proton ranges up to 48 ◦ in the laboratory system. This corresponds to an interval of the scattering angle from 80 ◦ to 180 ◦ in the centre-of-mass system. For absolute normalization the simultaneously measured np → d π o reaction was used above 280 MeV. The charged π NN coupling constant has been determined to f 2 π np = 0 . 076 ± 0 . 001.