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 2
1 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.
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