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Manuscript Title: A computer program for nuclear scattering at intermediate and high energies.
Authors: C.A. Bertulani, C.M. Campbell, T. Glasmacher
Program title: DWEIKO
Catalogue identifier: ADRN_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 152(2003)317
Programming language: Fortran.
Computer: IBM-PC.
Operating system: WINDOWS, UNIX.
RAM: 1M words
Word size: 64
Keywords: Elastic scattering, Coulomb excitation, Relativistic collisions, Coupled-channels, Nuclear excitation, Nuclear physics, Direct reaction.
Classification: 17.11.

Nature of 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.

Solution method:
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.

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.