Abstract
Abstract A compound-nucleus mechanism is considered for the reaction where the isobaric analogue resonance (IAR) is populated by a (p, n) stage and decays later emitting a proton p. It is shown that this mechanism leads to an enhancement in the p spectra near the IAR energy of the type expected from t · T charge exchange. This phenomenon is general, and will occur whenever the analogue state is not populated selectively in the entrance channel. For the case 91Zr(p, np)90Zr(g.s.) we estimate the contribution to the cross section due to this mechanism. It is found that the model reproduces the shape of the measured cross section and a normalization consistent with the uncertainties of the data. In order to handle fine-structure properties of the IAR, we develop a version of the external-mixing model particularly adapted for these purposes.
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