Abstract
We have applied a microscopic model of the A(p, π) A+1 reaction that includes both the one-nucleon mechanism and the resonance p-wave rescattering part of the two-nucleon mechanism to the 16 O( p, π +) 17 O and 12,13,14 C( p, π −) 13,14,15 O reactions leading to two-particle one-hole final states to test separately the two-nucleon mechanism part of the model. The calculations reproduce fairly well the differential cross section and analyzing power data for 16 O( p ̄ , π +) transitions leading to high-spin, two-particle one-hole states in 17O at 7.76 MeV( 11 2 −) and 15.8 MeV( 13 2 −) at bombarding energies of 200, 250 and 354 MeV, but underestimate appreciably the differential cross sections for 12,13,14 C( p ̄ , π −) transitions leading to the ground states 13,14,15O and the 7.28 MeV( 7 2 +) excited state of 15O and fail to reproduce the analyzing-power angular distributions for these (p, π −) transitions. These results verify that NN → NN Δ → NN π is the underlying two-nucleon process in the 16O(p, π +) reactions, but that non-Δ channels dominate the 12,13,14C(p, π −) reactions. The latter conclusions is consistent with results of recent studies of the pn ↔ π −pp reaction.
Published Version
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