Center-of-mass effects on the quasihole spectroscopic factors in the 16O(e,e′p) reaction

D. Van Neck, M. Waroquier, A.E.L. Dieperink, S.C. Pieper, V.R. Pandharipande
Physical Review C
57 (5), 2308-2315
Published while none of the authors were employed at the CMM


The spectroscopic factors for the low-lying quasihole states observed in the 16O(e,e′p)15N reaction are reinvestigated with a variational Monte Carlo calculation for the structure of the initial and final nucleus. A computational error in a previous report is rectified. It is shown that a proper treatment of center-of-mass motion does not lead to a reduction of the spectroscopic factor for p-shell quasihole states, but rather to a 7% enhancement. This is in agreement with analytical results obtained in the harmonic oscillator model. The center-of-mass effect worsens the discrepancy between present theoretical models and the experimentally observed single-particle strength. We discuss the present status of this problem, including some other mechanisms that may be relevant in this respect.