A comparison is presented of the predictions of the absorption model and the Regge-pole hypothesis for the production, at small momentum transfers, of nucleon isobars in proton-proton scattering in the incident momentum range of (5.5÷30) GeV/c. The study is applied to the nucleon isobars of mass 1238 MeV, 1400 MeV, 1512 MeV and 1688 MeV, respectively. One obtains reasonable agreement with experiment for the production of the 1238 MeV isobar (isospinT=3/2) assuming pion exchange using either the absorption model or a Regge-pole model. Pion exchange does not appear to account for the production of theT=1/2 isobars (1400 MeV, 1512 MeV and 1688 MeV). The production of the latter has features which are characteristic of domination by the Pomeranchuk trajectory.
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