INFLUENCE OF RELATIVISTIC EFFECTS ON ELECTRON-LOSS CROSS SECTIONS OF HEAVY AND SUPERHEAVY IONS COLLIDING WITH NEUTRAL ATOMS
Tolstikhina I.Yu., Tupitsyn I.I., Andreev S.N., Shevelko V.P.

Received: January 10, 2014

DOI: 10.7868/S0044451014070013

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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 ) 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 MeV/u, the relativistic interaction between colliding particles leads to a quasiconstant behavior of the loss cross sections σ_EL^rel \sim const, to be compared with the Born asymptotic law .