Genre: Information/Explanation

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 .