DOI: 10.1140/epja/i2001-10270-4
Implication of proton-nucleus scattering for density distributions of unstable nuclei
M. RashdanDepartment of Mathematics and Theoretical Physics, Atomic Energy Authority, Cairo, Egypt mrashdan@hotmail.com
(Received: 1 December 2001 / Revised version: 5 July 2002 / Published online: 18 February 2003)
Abstract
The use of elastic proton scattering at intermediate and high
energies to obtain information about the density distributions of
unstable nuclei is investigated. A comparison between the
relativistic impulse approximation (RIA) and Glauber model for
proton scattering from
,
,
and
at
medium energies is performed. We used density distributions
derived from the relativistic mean-field theory, employing the recent
relativistic force NL-RA1, as well as experimental and
phenomenological densities. It is found that the eikonal
approximation can describe the cross-section only at small
scattering angles and is weakly sensitive to the density
distributions, while the RIA nicely produced the experimental
cross-sections, even at medium and larger angles, and was very
sensitive to the nuclear densities. Furthermore, the RIA better
describes the isospin dependence of the cross-section. We used the
RIA to investigate the density distribution of
for
proton scattering at different energies. It is found that the
cross-section strongly depends on the parameters of the density
distribution even at a small scattering angle. These results are
important in extracting information about the structure of
unstable nuclei. We also investigated the RIA and its sensitivity
in describing halo nuclei such as
. We used for
a
no-halo Gaussian density and a realistic-halo density that derived
in the cluster orbital shell model approximation and contains the
extended distribution of the valence nucleons. Comparison with the
recent experimental data at GSI at 717 MeV/nucleon shows that the
RIA successfully described the data at all considered range of the
momentum transfer and on the other hand favor the halo
structure of
.
24.10.Jv - Relativistic models.
25.60.-t - Reactions induced by unstable nuclei.
© Società Italiana di Fisica, Springer-Verlag 2003
