The 90° yield curves for the ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(\overrightarrow{p},{\gamma }_0){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(\overrightarrow{p},{\gamma }_1){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ reactions have been measured in 200 keV steps for $E_p=6.25\mathrm{} \mathrm{to} 13.6$ MeV and in 100 keV steps for $E_p=13.6\mathrm{} \mathrm{to} 17.0$ MeV. In addition, 50 keV step data were obtained for $E_p$ of 12.6 to 14.55 MeV. Angular distributions of both the cross section and the analyzing power were also obtained for these two reactions at twelve energies which span the giant dipole energy region. The cross section was measured at nine angles between 30° and 154° while the analyzing power was measured at seven angles between 42° and 142°. These data were used to obtain the complex $E1\mathrm{}$ and $E2\mathrm{}$ transition matrix elements in the case of ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(\overrightarrow{p},{\gamma }_1){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$. The results are compared to a direct-semidirect calculation. It is found that there is little justification in introducing $E2\mathrm{}$ amplitudes other than a pure direct $E2\mathrm{}$ term.

NUCLEAR REACTIONS ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(\overrightarrow{p},{\gamma }_0)$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(\overrightarrow{p},{\gamma }_1)$ measured $\sigma \left(\theta \right)$ and $A\left(\theta \right)$, $E_p=8.05\mathrm{}-15.5$ MeV. ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(p,{\gamma }_0)$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(p,{\gamma }_1)$ measured $\sigma \left(90\mathrm{}°\right)$, $E_p=6.24\mathrm{}-17.0$ MeV. Deduced $E1\mathrm{}$ and $E2\mathrm{}$ $T$-matrix amplitudes and phases. Compared to model calculations.

• Received 5 July 1979

DOI:https://doi.org/10.1103/PhysRevC.21.525