Recent measurements on the energy spectra of ejectiles in the (p,n) and ${(}^3$He,t) reactions in coincidence with the p${\mathrm{\pi }}^{+}$ charged particles and integrated over their energies and angles are analyzed theoretically in the DWIA framework. It is assumed that the p${\mathrm{\pi }}^{+}$ events are generated by the direct decay of ${\mathrm{\Delta }}^{++}$. Due to the peripheral nature of the reaction the ${\mathrm{\Delta }}^{++}$ itself is assumed to be produced through the quasifree pp→n${\mathrm{\Delta }}^{++}$ process. The interaction for this process is described by the pseudovector one-pion-exchange relativistic Lagrangian. The parameters of this Lagrangian are taken such that it reproduces the measured spin averaged cross sections on the pp→n${\mathrm{\Delta }}^{++}$ reaction very well, over a wide energy range. Our calculated cross sections for the ejectile spectra on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ agree very well with the corresponding measured cross sections.

• Received 1 November 1993

DOI:https://doi.org/10.1103/PhysRevC.50.370