RELATIVISTIC HIGHLY-CHARGED ION COLLISIONS

We study theoretically K shell-K shell single electron capture in ion- ion collisions at relativistic impact energies in reactions involving highly charged ions. We obtain differential and total cross sections f or the charge transfer reaction U92+ + U91+ with and without spin-flip of the captured electron by using two different distorted wave models : the Matrix Continuum Intermediate State and the Matrix Continuum Dis torted Wave. We analyse the influence of the double dispersion mechani sms on the cross sections. We also study the contributions to cross se ctions coming from collisions at different impact parameters. At small impact parameters the reduced transition probabilities are dominated by spin-flip reactions.