Elsevier

Nuclear Physics A

Volume 548, Issue 4, 26 October 1992, Pages 637-648
Nuclear Physics A

Role of the Δ-isobar in the A(p, π)A+1 reaction

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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 16O(p, π+)17O and12,13,14C(p, π)13,14,15O 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 16O(p̄, π+) transitions leading to high-spin, two-particle one-hole states in 17O at 7.76 MeV(112) and 15.8 MeV(132) at bombarding energies of 200, 250 and 354 MeV, but underestimate appreciably the differential cross sections for 12,13,14C(p̄, π) transitions leading to the ground states 13,14,15O and the 7.28 MeV(72+) excited state of 15O and fail to reproduce the analyzing-power angular distributions for these (p, π) transitions. These results verify that NN → NNΔ → NNπ 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 ↔ πpp reaction.

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    Present address: BSO/Management Support, P.O. Box 543, 3740 AM Baarn, The Netherlands.

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