Self-consistent Green's function calculation of 16O at small missing   energies
  Calculations of the one-hole spectral function of 16O for small missing energies are reviewed.   The self-consistent Green's function approach is employed together with the Faddeev equations technique in order to study the coupling of both particle-particle and particle-hole phonons to the single-particle motion. The results indicate that the characteristics of hole fragmentation are related to the low-lying states of 16O and an improvement of the description of this spectrum, beyond the random phase approximation, is required to understand the experimental strength distribution.   A first calculation in this direction that accounts for two-phonon states is discussed. 
C. Barbieri (TRIUMF), W. H. Dickhoff (Washington University in   St.Louis)