Simulation of Nucleon Elastic Scattering in the MARS14 Code System

Correct modeling of nucleon elastic scattering is of special importance in many applications at high energy accelerators, such as deep penetration, beam loss and collimation studies. In present paper, the work performed to update the MARS elastic scattering model at E < 5 GeV is described. Modem evaluated nuclear data as well as fitting formulae are used in the new model For protons as projectiles, Coulomb scattering and Coulomb-nuclear interference are taken into account in addition to nuclear elastic scattering. Comparisons with experimental angular distributions and calculations by means of other codes are presented. The elastic scattering model for nucleons with energies in the range of 20-5000 MeV based on the evaluated nuclear data was developed and implemented in the MARS 14 code system. Comparisons with experimental data reveal a good agreement for the wide range of target nuclei and projectile energies. Importance of the model is demonstrated in a typical example of a stripping foil used in a beam injection system. (authors)