The reactions ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(p, t){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(p, {}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^{11}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(p, t){}_{}{}^{14}{}_{}{}^{}\mathrm{O}$, and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(p, {}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ have been studied at several incident energies between 24 and 44 MeV. Previous results on the ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}(p, t){}_{}{}^{13}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}(p, {}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ reactions are also considered in the analysis. The energy dependence of cross section ratios for mirror transitions evidences that these reactions cannot be described below 35-40 MeV simply as a direct two-nucleon pickup. The values for spin and isospin dependent terms in the effective interactions obtained from a distorted-wave Born-approximation analysis differ from those used in shell model calculations and in microscopic analyses of inelastic scattering.

NUCLEAR REACTIONS ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(p, t)$, ($p$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$), $E=26.8-43.1\mathrm{}$ MeV; measured $\sigma (E_t, \theta )$, $\sigma (E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}, \theta )$; ${\theta }_{\mathrm{lab}}=10-72.5\mathrm{}°$. ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(p, t)$, ($p$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$), $E=32.2, 36.6, 43.5$ MeV; measured $\sigma (E_t, \theta )$, $\sigma (E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}, \theta )$, ${\theta }_{\mathrm{lab}}=10-82.5\mathrm{}°$; resolution 200 keV. Reaction mechanism analysis.

• Received 6 August 1974

DOI:https://doi.org/10.1103/PhysRevC.11.64