[pi][pi]-angular correlations for [pi][sup [minus]][ital p][r arrow][pi][sup +][pi][sup [minus]][ital n] in the region of the [Delta] dominance

The reaction [pi][sup [minus]][ital p][r arrow][pi][sup +][pi][sup [minus]][ital n] was studied at a total c.m. energy of 1301 MeV. The incoming pion beam was focused on a liquid hydrogen target. For the [pi][sup +] detection a large acceptance spectrometer was used whereas the outgoing [pi][sup [minus]] was measured in a 4 sr detector arrangement. A collected set of 32 000 kinematical complete [pi][sup [minus]][ital p][r arrow][pi][sup +][pi][sup [minus]][ital n] events delivered invariant mass distribution and double differential cross sections as well as angular correlation functions and triple differential cross sections, respectively. The observables, showing a characteristic deviation from phase space, are compared with model calculations based on Weinberg's Lagrangian. The dynamics of the reaction is well described. In addition, there are clear indications for the need of relativistic corrections, whereas the data do not justify strong contributions of [sigma]- and [rho]-propagation diagrams.