The ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}(p,t){}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ reaction has been studied at 20 MeV. Relative cross sections to the ground ($0^{+}$), 6.05 MeV ($0^{+}$), 6.92 MeV ($2^{+},K=0\mathrm{}$), and 9.85 MeV ($2^{+},K=2\mathrm{}$) states have been compared with standard distorted-wave Born-approximation (DWBA) calculations using ${\mathrm{SU}}_3$ parentage factors and the nuclear coexistence model. The agreement is good for the $0^{+}$ states but poor for the $2^{+}$ states, given the uncertainties inherent in the DWBA calculation itself. The presence of competing second-order processes is indicated by the relatively strong population of the 8.88 MeV $2^{-}$ level.

NUCLEAR REACTIONS, STRUCTURE ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}(p,t) E=20\mathrm{}$ MeV; measured $d\sigma \left(\theta \right)$; resolution 25 keV. DWBA calculation of $d\sigma \left(\theta \right)$. Nuclear coexistence model.

• Received 3 June 1974

DOI:https://doi.org/10.1103/PhysRevC.10.1350