Selective Population Shown by Five-Particle Transfer Reactions

Spectra and angular distributions were obtained for the reactions $^{16}$O(d,p)$^{17}$O, $^{14}$N($^{7}$Li,$\alpha$)$^{17}$O, $^{14}$N($^{6}$Li,$^{3}$He)$^{17}$O, $^{12}$C($^{7}$Li,d)$^{17}$O, and $^{12}$C($^{6}$Li,p)$^{17}$O. Excitation functions were also measured for $^{12}$C($^{7}$Li,d) in the energy range 32-35 MeV and for $^{12}$C($^{6}$Li,p) in the energy range 26-32 MeV. These data were collected using the FSU Tandem/LINAC accelerator. Selective population of states in $^{17}$O was observed in each of these reactions, and the states populated in each reaction type did not vary with energy. This result indicates a direct, single-step transfer in each case. Further evidence for single-step transfer in the five-particle transfer reactions is provided by DWBA calculations performed on the selectively populated levels. In addition, characterization of particular $^{17}$O levels above 11 MeV will be presented. The most strongly excited state is at 11.82 MeV and its spin has been determined to be 7/2.