Measurements of cross sections and analyzing powers are examined for polarized proton capture on ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, and ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}$ at energies which cover the giant dipole resonance region. These data are used to extract the relative amplitudes and phases of the contributing $E1\mathrm{}$ $T$-matrix elements. A typical result exhibits two solutions. Calculations using the direct (or a direct-semidirect) capture model appear to provide a means for choosing the physical solution.

NUCLEAR REACTIONS: ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}(\overrightarrow{p}, {\gamma }_0)$, ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}(\overrightarrow{p}, {\gamma }_0)$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}(\overrightarrow{p}, {\gamma }_0)$, ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}(\overrightarrow{p}, {\gamma }_0)$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Fe}(\overrightarrow{p}, {\gamma }_0)$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}(\overrightarrow{p}, {\gamma }_0)$, ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}(\overrightarrow{p}, {\gamma }_0)$; measured $\sigma \left(\theta \right)$ and $A\left(\theta \right)$ over energy region of the giant dipole resonance. Deduced $T$-matrix amplitudes and phases. Compare results to direct-semidirect model calculations.

• Received 27 December 1977

DOI:https://doi.org/10.1103/PhysRevC.18.65