Description of proton characteristics in np-interactions at Pn=3.83 and 5.1 GeV/c within the framework of FRITIOF model

Proton distributions on rapidity and transverse momentum in the reactions np → ppπ-, np → ppπ-π0 and np → npπ+π- are analyzed. It is shown that primary FRITIOF model reproduces the considered characteristics only qualitatively. Taking into account a charge exchange between colliding nucleons and tuning the transferred transverse momentum allows one to reach the better description. At the same time the description of π-meson characteristics becomes something worse. So, due to choosing of model parameters a complex description of np-interactions is reached. (author)