Total charge transfer cross sections for 400 MeV bare Fe26+ions colliding with He, N2, Ne and Ar targets

Abstract

The authors have measured total cross sections for electron transfer between 400 MeV bare Fe26+ ions and He, N2, Ne and Ar targets, corresponding to intermediate to high reduced velocities, 1<or= nu / nu i,f<or=10 ( nu is the incident projectile velocity and nu i,f are the initial and final orbital velocities of the captured electron). The data were determined from the intensities of the Lyman X-rays emitted by the Fe25+ after electron capture. A first Born (OBK) calculation is in clear disagreement with the values for all the targets. On the other hand, the continuum distorted-wave method, the strong-potential Born method and the impulse approximation, all including the influence of intermediate continuum states upon the capture process, are in much closer agreement with the experimental results.