Effective fully differential cross-section in single ionization of helium by fast ions

Fully differential measurements for the single ionization of helium by fast ion impacts are discussed by evaluating effective fully differential cross-sections (EFDCSs) proposed by Kouzakov (2017 Eur. Phys. J. D 71 63) where the coherence properties of the projectile and the target beams are taken into account. The present evaluation of the EFDCS is extended by including instrumental uncertainties. The experimental data are compared with theoretical results where the electron emission is described within the framework of the continuum distorted wave with eikonal initial state (CDW-EIS) method. In most cases, the obtained EFDCSs agree with the experimental data better than those evaluated without considering coherence properties and inclusion of experimental uncertainties. (paper)