How important are two-step processes inO16(He3, d)F17?

Angular distributions were measured for the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({}_{}{}^3{}_{}{}^{}\mathrm{He}, d){}_{}{}^{17}{}_{}{}^{}\mathrm{F}$ reaction leading to the first four states of ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$. Comparison with distorted-wave Born-approximation (DWBA) calculations yields spectroscopic factors of 0.94 and 0.83 for the ground and first-excited states, respectively. Comparison with unbound DWBA predictions calculated from the known proton widths of the next two states indicates the presence of a large two-step component for population of the ${\mathrm{½}}^{-}$ state and possibly of the ${\frac{5}{2}}^{-}$ state.