INFLUENCE OF RELATIVISTIC EFFECTS ON ELECTRON-LOSS CROSS SECTIONS OF HEAVY AND SUPERHEAVY IONS COLLIDING WITH NEUTRAL ATOMS

摘要

The influence of relativistic effects, such as relativistic interaction and relativistic wave functions, on the electronloss 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 σrel/El ~ const, to be compared with the Born asymptotic law σBel/El ~ In E/E.