Dynamic electron correlations in single capture from helium by fast protons

Abstract

We employ the four-body continuum distorted-wave (CDW-4B) method to compute the total cross sections for the single electron-capture process ${\mathrm{H}}^{+}+\mathrm{H}\mathrm{e}{(1s}^{2})\ensuremath{\rightarrow}\mathrm{H}(1s)+{\mathrm{He}}^{+}(1s)$ at incident energies ranging from 20 to 20 000 keV. The purpose of the present work is twofold: (i) to verify whether the CDW-4B approximation for one-electron transfer is as successful as for double charge exchange in fast proton-helium collisions and (ii) to search for evidence of dynamic electron correlation effects as a function of increased projectile energy. The validity of our findings is critically assessed in comparisons with the available experimental data in the quoted impact energy range.