Level Structure ofO17and theC13(Li6,d)andC13(Li7,t)Reactions

Abstract

The reactions ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}({}_{}{}^7{}_{}{}^{}\mathrm{Li},t){}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}({}_{}{}^6{}_{}{}^{}\mathrm{Li},d){}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ have been studied at 17 and 18 MeV, respectively. Both reactions are selective in the states they populate, although this is more evident in the (${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, $t$) case. Angular distributions were extracted for 15 levels below 8.5-MeV excitation. These exhibit pronounced structures and are generally indicative of direct-reaction mechanisms. Transitions to the negative-parity states at 3.06, 3.85, and 4.55 MeV are the strongest observed below 7-MeV excitation. These levels are discussed within the framework of the weak-coupling model and the transitions compared with those from the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^7{}_{}{}^{}\mathrm{Li},t)$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^6{}_{}{}^{}\mathrm{Li},d)$ reactions leading to the first $K=0\mathrm{}$ rotational band in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. Strong transitions are also observed to levels at 7.38, (8.46, 8.49), (8.87, 8.95), and (9.14, 9.20) MeV.