ABSTRACT
The total reaction cross-section is one of the most important physical quantities
used to characterize the nuclear reaction. It is very useful for extracting the nuclear
size, the nuclear density, the shape of the nuclei, the interaction potential between
nuclei, the nucleon-nucleon cross section in nuclear medium and it finds other
applications in various fields of research as radiobiology and space radiation. In the
present work, we presented a new method for researching the total reaction
cross-section of exotic nuclei by using improved Glauber model with deformation
parameter β2.
Firstly, several theoretical analysis of the total reaction cross section are introduced,
such as Glauber model, Boltzmann-Uehling-Uhenbeck equation and Quantum
Molecular Dynamics. But Glauber model is a semi-classical method, it provides
reasonable agreement with experiment at high energies while failed to describe the
lower energy collisions. We modified Glauber model in the following aspects:
Coulomb effect, Fermi motion, Pauli blocking and in medium effect et al. Secondly,
we discussed the halo phenomenon and the main theory of nuclear density distribution
and calculated the total reaction cross section of stable nuclei. It got the satisfactory
agreement between the calculated results and the experimental data in low energy
region with less than ten percent for the most of nucleus-nucleus reactions. On the
basis of this, we studied the total reaction cross section of halo nucleus to the stable
nucleus, found that one only can get the satisfactory agreement between the
calculation results and experimental data after considering the halo structure of halo
nuclei. Furthermore, we discussed weather halos exist on the drip line of deformed
nuclei. The total reaction cross section of deformed nuclei with halo structure are
calculated with our improved Glauber model, it showed that both the halo structure
and the deformation effect enhances the agreement with the experimental data.
Improved Glauber model can give reasonable fitting with the experimental data.
In general, the expected results are achieved. But there are still some problems that
would be studied in the future. With the development of nuclear physics, people know
more about nuclear structure and the nuclear reaction processes. Glauber model
should be improved with further corrections when using it to study the total reaction
cross section.
Keywords: deformed Glauber model, halo nucleus, deformed
nucleus, total reaction cross section