Influence of Relativistic Effects on Electron-Loss Cross Sections of Heavy and Superheavy Ions Colliding with Neutral Atoms~1

摘要

The influence of relativistic effects, such as relativistic interaction and relativistic wave functions, on the electron-loss cross sections of heavy and superheavy atoms and ions (atomic number Z ? 92) colliding with neutral atoms is investigated using a newly created RICODE-M computer program. It is found that the use of relativistic wave functions changes the electron-loss cross section values by about 20-30% around the cross-section maximum compared to those calculated with nonrelativistic wave functions. At relativistic energies E ≥ 200 MeV/u, the relativistic interaction between colliding particles leads to a quasiconstant behavior of the loss cross sections σ_(EL)~(rel)~ const, to be compared with the Born asymptotic lawσ_(EL)~B~ lnE/E.