Surface manifestation of intrinsic
medium effects in the optical model
potential for nucleon scattering
Datum
16.2.2010 14:00
Přednášející
prof. Hugo Arellano
| Universidad de Chile
|
Obsah
The optical model potential (OMP) constitutes one of the primary
tools for studying and interpreting nuclear scattering data. From first principles, this one-body
operator can formally be identified with the mass operator in the Dyson expansion of the oneparticle
Green function. The use of the Brueckner-Bethe-Goldstone G-matrix and simplifying
assumptions on its the momentum- and/or coordinate-space structure has allowed the
realization of efficient forms for the OMP, providing reasonably good description of a broad
body of scattering data. However, remaining discrepancies call for a closer scrutiny of the
various contributions leading to the first-order term. In this seminar we review some general
aspects of the OMP, particularly its momentum- and coordinate-space structures. It will be
shown that the intrinsic medium effects of the NN effective interaction can be disentangled
from those in free space. This feature leads to surface-peaked contributions of the g-matrix in
the evaluation of the optical potential. The scope of these findings on ongoing and future
research will be discussed.