arXiv:nucl-th/9804067·v1·Nuclear Theory
Center-of-mass effects on the quasi-hole spectroscopic factors in the 16O(e,e'p) reaction
D. Van Neck (1) · M. Waroquier (1) · A.E.L. Dieperink (2) · Steven C. Pieper (3) · V.R. Pandharipande (4) ((1) University of Gent · Belgium (2) KVI · Groningen · The Netherlands (3) Argonne National Laboratory (4) University of Illinois at Urbana-Champaign)
Abstract
The spectroscopic factors for the low-lying quasi-hole 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 -shell quasi-hole 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.
Comments: 14 pages, no figures, uses Revtex, to be published in Phys. Rev. C 58 (1998)