Deexcitation $\gamma$ rays of ${}_{}{}^{30}{}_{}{}^{}\mathrm{Al}$ following the ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$,pn)${}_{}{}^{30}{}_{}{}^{}\mathrm{Al}$ fusion-evaporation reaction have been observed in singles, in coincidence with the evaporated protons, and in coincidence with other $\gamma$ rays in cascade. Gamma-ray yield curves were measured over the ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ beam energy range 15-35 MeV. Angular distributions of $\gamma$ rays observed in coincidence with protons at 0° were measured for four transitions. Limits on level lifetimes were determined, and no evidence for a long-lived isomeric transition was found. Excitation energies deduced are, in keV: 0, 243.90(8), 687.53(12), 991.0(9), 1118.7(7), and 1245.6(8). Corresponding spins and parities are $3^{+}$, ${\mathrm{}(1,2)\mathrm{}}^{\pm }$, $1^{+}$, ${\mathrm{}(2,3,4)\mathrm{}}^{\pm }$, ${\mathrm{}(1,2,3)\mathrm{}}^{\pm }$, and ${\mathrm{}\left(4\right)\mathrm{}}^{\pm }$, respectively. The results are compared to recent shell model calculations.

NUCLEAR REACTIONS ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}({}_{}{}^{18}{}_{}{}^{}\mathrm{O}, \mathrm{pn}\gamma ){}_{}{}^{30}{}_{}{}^{}\mathrm{Al}$, $E\left({}_{}{}^{18}{}_{}{}^{}\mathrm{O}\right)=15-35\mathrm{}$ MeV; measured $I_{\gamma }(E, \theta )$, $E_{\gamma }$; $\mathrm{p}\gamma$ coin; $\gamma \gamma$ coin; deduced decay scheme, limits on $\tau$, probable $J$.

• Received 25 August 1983

DOI:https://doi.org/10.1103/PhysRevC.28.2343