Reply to 'Comment on "Four-body charge transfer processes in proton helium collisions"'

Houamer and Popov have performed a first Born approximation calculation (FBA) for TTE (charge transfer with target excitation) for 300 keV proton-helium collisions. Their results are in reasonable agreement with the absolute measurements of Schöffler (2006 PhD thesis, University of Frankfurt am Main) whereas our FBA results yielded the shape of the experimental data reasonably well (except for small scattering angles) but with a magnitude that was a factor of 144 larger than experiment. Consequently, Houamer and Popov conclude that our results must have huge numerical errors. We have extensively tested our codes and we do not find any evidence to support this claim.