The reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$,${}_{}{}^{13}{}_{}{}^{}\mathrm{N}$)${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ at 100 MeV is analyzed by means of an exact-finite-range coupled-channels Born-approximation code. In particular, the anomalous behavior of the $2S\frac{1}{2}$ transition is studied with respect to possible multistep processes. It is found that these reaction mechanisms are not able to resolve the phase discrepancy between the experimental data and the finite-range distorted-wave Born-approximation predictions for the angular distribution.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$,${}_{}{}^{13}{}_{}{}^{}\mathrm{N}$), $E=100\mathrm{}$ MeV; DWBA and CCBA finite range analysis.

• Received 2 December 1977

DOI:https://doi.org/10.1103/PhysRevC.18.2617