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The reaction $np \rightarrow np \pi^+ \pi^-$ was studied at the variousmomenta of incident neutrons. It was shown that the characteristics of thereaction at the momenta above 3 GeV/c could be described by the model ofreggeized $\pi$ exchange (OPER). At the momenta below 3 GeV/c, it was necessaryto use additionally the mechanism of one baryon exchange (OBE).

Analysis of the Reaction: $np \rightarrow np \pi^+ \pi^-$ from the Point of View of Oper-Model