Eur. Phys. J. A 17, 65-69 (2003)
DOI: 10.1140/epja/i2002-10137-2

Spectroscopic information from different theoretical descriptions of (un)polarized reactions

M. Radici¹, A. Meucci¹ and W.H. Dickhoff <sup>2

1</sup>  Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, and Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100 Pavia, Italy
²  Department of Physics, Washington University, St. Louis, MO 63130, USA

andrea.meucci@pv.infn.it

(Received: 16 September 2002 / Revised version: 10 January 2003 / Published online: 8 April 2003)

Abstract
We analyze the unpolarized and polarized electron-induced proton knockout reactions on ¹⁶O in different kinematical settings using two theoretical approaches. The first one is based on a relativistic mean-field distorted-wave description of the bound and scattering states of the proton, including a fully relativistic electromagnetic current operator. The second approach adopts the same current operator, but describes the proton properties on the basis of microscopic calculations of the self-energy in ¹⁶O below the Fermi energy and final-state damping in nuclear matter above the Fermi energy, using the same realistic short-range and tensor correlations. Good agreement with all unpolarized data is obtained at low and high Q² by using the same spectroscopic factors fixed by the low- Q² analysis. A reasonable agreement is achieved for polarization observables.

PACS
25.30.Dh - Inelastic electron scattering to specific states.
24.70.+s - Polarization phenomena in reactions.
24.10.Jv - Relativistic models.
24.10.Eq - Coupled-channel and distorted-wave models.

© Società Italiana di Fisica, Springer-Verlag 2003