Electron scattering at 1800 from the ''single-hole'' states in 15N

Results are presented for the scattering of electrons through 1800 from the (1/2)- ground state and the (3/2)- excited state at 6.32 MeV in 15N. The range of the momentum transfer q is from 0.70 to 3.25 fm-1. Comparisons are made with the predictions of the 0p-shell proton-hole model, a large basis 2hω shell model calculation, and core polarization models. In general, it was found that the theoretical description of the data improved markedly as the model space was expanded, but the predicted cross sections were consistently below the data for q>2.4 fm-1. The present data rule out the low value of the Migdal parameter g' needed to describe the (e,e') data for 12C and 13C, and do not support the previous suggestion that pion-condensation effects are important in finite nuclear systems