CENTER-OF-MASS EFFECTS ON THE QUASI-HOLE SPECTROSCOPIC FACTORS IN THEO-16(E,E'P) REACTION

The spectroscopic factors for the low-lying quasihole states observed in the O-16(e,e'p)N-15 reaction are reinvestigated with a variational Monte Carlo calculation for the structure of the initial and final nuc leus. A computational error in a previous report is rectified. It is s hown 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 p resent status of this problem, including some other mechanisms that ma y be relevant in this respect. [S0556-2813(98)03005-2].