Similarities between cross sections and analyzing powers are reported for proton capture into 1$d_{5/2}$ orbits populating the ground state of ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$ and the $3^{\mathrm{-}}$ second-excited state in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$; for captures into 2$s_{1/2}$ orbits populating the ground state of ${}_{}{}^{29}{}_{}{}^{}\mathrm{P}$ and the $2^{+}$ first-excited state in ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$; and for the 1$d_{3/2}$ orbits populating the ${(3/2\mathrm{}}^{+}$ first-excited state in ${}_{}{}^{29}{}_{}{}^{}\mathrm{P}$ and the $4^{+}$ second-excited state in ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$. The results are in reasonable accordance with the predictions of a direct-semidirect picture for nuclear capture reactions.

• Received 3 September 1987

DOI:https://doi.org/10.1103/PhysRevC.37.1759