C13(Li7, p)O19Reaction and the Spins of Low-Lying States inO19

Low-lying levels of ${}_{}{}^{19}{}_{}{}^{}\mathrm{O}$ were populated by the ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}({}_{}{}^7{}_{}{}^{}\mathrm{Li}, p){}_{}{}^{19}{}_{}{}^{}\mathrm{O}$ reaction at a bombarding energy of 16.0 MeV. Angular distributions were measured for all states below 3.3 MeV in excitation energy. The shapes of these angular distributions, and the ($2J+1$) dependence of the integrated cross sections are consistent with a compound-nucleus mechanism for the reaction. The measured cross section for the level at 3.235 MeV suggests that it has a spin of $\frac{3}{2}$ rather than ½.