The single particle energies in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ were studied within the framework of the folded diagram many-body perturbation theory up to third order in the G matrix starting from the Bonn-A N-N interaction. The convergence of the expansion was also studied; a fast converging result was found when the self-energy insertions were summed up to infinite order. The agreement with the experimental values is reasonable.

• Received 9 November 1993

DOI:https://doi.org/10.1103/PhysRevC.50.1240