PROGRAM SUMMARY
Title of program:
DWEIKO
Catalogue identifier:
ADRN
Ref. in CPC:
152(2003)317
Distribution format: tar gzip file
Operating system: WINDOWS or UNIX
High speed store required:
1MK words
Number of bits in a word:
64
Number of lines in distributed program, including test data, etc:
3161
Keywords:
Elastic scattering, Coulomb excitation, Relativistic collisions,
Coupled-channels, Nuclear excitation, Nuclear physics,
Direct reaction.
Programming language used: Fortran
Computer:
IBM-PC .
Nature of physical problem:
The program calculates elastic scattering differential cross sections,
probabilities, and cross sections for inelastic scattering in nuclear
collisions at intermediate and high energies (Elab >= 50 MeV/nucleon).
It is particularly useful in the analysis of experiments with stable and
unstable nuclear beams running at several intermediate-energy heavy ion
accelerators around the world.
Method of solution:
Eikonal wavefunctions are used for the scattering. For each "impact
parameter" entering the scattering matrix elements, one solves
coupled-channels equations for the time dependent Coulomb + nuclear
field expanded into multipoles. A four-point Runge-Kutta procedure is
used to solve the coupled-channels equations. The elastic scattering is
calculated purely with the eikonal approximation. The coupled-channels
is a separate calculation for the inelastic amplitudes. The inelastic
couplings, therefore, have no effect on the obtained elastic scattering
cross sections.
Typical running time:
Almost all the CPU time is consumed by the solution of the
coupled-channels equations. It is about 2 min on a 1GHz Intel
P4-processor machine for the inclusion of 5 nuclear states.