The analysis of the cross section and analyzing power data of the ${}_{}{}^{13}{}_{}{}^{}$C(p→,${\gamma }_0$${)}^{14}$N reaction leads to two solutions for the E1 amplitudes and phases which contribute in the region of the giant dipole resonance. One of these solutions indicates that the reaction proceeds predominantly via d-wave capture while the other corresponds to predominant s-wave capture. In the present work, we have used the interference between the ${\mathit{E}}_{\mathit{p}}$=3.11 MeV M1 resonance and the E1-dominated background to determine which of the two off-resonance E1 solutions is the correct (physical) one. The results show that the dominant d-wave capture solution is the correct one in the region of this resonance, demonstrating that the low-energy off-resonance E1 strength has the same (dominant d-wave) structure as that expected from the giant dipole resonance.

• Received 8 October 1990

DOI:https://doi.org/10.1103/PhysRevC.43.1363