Nucleon--nucleon interactions in the double folding model for fusion reactions
Zhang Gao-Longa, Le Xiao-Yuna, Liu Haob
a Department of Physics, School of Science,
Beijing
University of Aeronautics and Astronautics, Beijing 100083, China; b Physics Laboratory, Lanzhou Commercial College, Lanzhou
730020, China
Abstract Nucleus--nucleus potentials are determined in the framework of
double folding model for M3Y--Reid and M3Y--Paris effective
nucleon--nucleon (NN) interactions. Both zero-range and
finite-range exchange parts of NN interactions are considered in
the folding procedure. In this paper the spherical
projectile--spherical target system 16O+208Pb is selected
for calculating the barrier energies, fusion cross sections and
barrier distributions with the density-independent and
density-dependent NN interactions on the basis of M3Y--Reid and
M3Y--Paris NN interactions. The barrier energies become lower for
Paris NN interactions in comparison with Reid NN interactions,
and also for finite-range exchange part in comparison with
zero-range exchange part. The density-dependent NN interactions
give similar fusion cross sections and barrier distributions, and
the density-independent NN interaction causes the barrier
distribution moving to a higher position. However, the
density-independent Reid NN interaction with zero-range exchange
part gives the lowest fusion cross sections. We find that the
calculated fusion cross
sections and the barrier
distributions are in agreement with the experimental data after
renormalization of the nuclear potential due to coupled-channel
effect.
Received: 19 April 2008
Revised: 27 August 2008
Published: 20 January 2009
