Quasielastic proton knockout fromO16

The spectral function of the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(e,e’p${)}^{15}$N reaction has been measured in quasielastic parallel kinematics. Momentum distributions are extracted for transitions to several discrete states, with emphasis on the low-lying positive parity states of ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$. Spectroscopic factors and bound state wave functions are deduced from a DWIA analysis employing five different optical potentials. Coupled channels effects are investigated for the first four states of ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ and are found to be minimal. The spectroscopic results of the 1/$2^{\mathrm{-}}$ ground state and the first 3/$2^{\mathrm{-}}$ excited state indicate a 28%±5.4% reduction of the valence 1p shell strength with respect to the IPSM sum rule limit for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. The spectroscopic strength for knockout of protons from the 2s1d shell, integrated up to a missing energy of 40 MeV, is found to be 0.269±0.033. The distribution of proton spectroscopic strength is determined from a multipole decomposition of the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ spectral function.