Speaker
Description
The interest in recent years in quasi-free scattering (QFS) originates from its util-
ity as a tool to investigate single particle properties of unstable nuclei. However, the
difference in quenched spectroscopic behaviour as a function of proton-neutron asym-
metry observed between nucleon removal reactions on light nuclei e.g. 9Be(28S,27P),
transfer reactions, and (p,pN) reactions in inverse kinematics would seem to imply that
structure information depends strongly on the description of the reaction dynamics.
For a better understanding of the reaction dynamics of QFS it is best to return to the
experimentally less complicated direct kinematics meaurements. Especially now that
theoretical tools are available that can overcome limitations of the Distorted Wave
Impulse Approximation (DWIA) traditionally used to describe QFS. Substantial devi-
ations are observed between experimental and state of the art theoretical cross-sections
for the 12C(p,2p)11B reaction at 400 MeV, as performed at RCNP. In order to disen-
tangle the nuclear structure and reaction dynamics contribution to these deviations,
it would be interesting to determine what happens at a lower beam energy of 200
MeV. In the near future an experiment will be performed at iThemba LABS to in-
vestigate quasi-free scattering to individual states in the residual 11B nucleus through
the 12C(p,2p)11B reaction at 200 MeV. Coincident proton detection with the K600
magnetic spectrometer and a detector telescope is envisaged. Also, possible devel-
opments of a new coincident detector telescope system using LaBr detectors will be
briefly explored.
