Study on the nucleon excitation mechanism in proton-neutron collisions at 19.2 GeV/c

Data on the reactions with two pion production are given: pn → ppπ-π0; pn → pnπ+π-. Three-prong events recorded in 200 cm CERN deuterium chamber exposed to 19.2 GeV/c pulse are analized. 7600 measurements have been carried out. The following regularities have been discovered: 1) dissociation of bombarding proton and neutron of target is associated with a zero charge exchange, which points to the diffractive character of the process; 2) nucleon diffractive dissociation cross-sections for two and three-particle modes of decay coincide and equal approximately 0.4 mb; 3) dissociation cross-section and excitation mass spectra do not depend of nucleon charge state