Electron Capture fromHe(1s2)by Protons. II

Abstract

The Born prior and post cross sections are calculated for the process, ${\mathrm{H}}^{+}+\mathrm{He}\left(1\mathrm{}{s}^2\right)\to \mathrm{H}\mathrm{}\left(1s\right)+{\mathrm{He}}^{+}\mathrm{}\left(1s\right)\mathrm{}$, using the six-parameter helium wave function of Hylleras. The prior-post discrepancy (i.f.d.) is usually less than 1% in the energy range of this investigation, 40 keV to 1 MeV. Thus, the wave function is apparently adequate for this type of scattering calculation. These new cross sections are compared with the corresponding old cross sections calculated with the wave function, $\exp [-Z(x_1+x_2\left)\right]$, ($Z=1.6875\mathrm{}$); the new average cross sections, average of prior and post, are usually less than the old average values. The BK (Brinkman-Kramers) cross sections are also calculated. Although the new BK values are usually less than the old values, the new BK cross section at 10 MeV exceeds the old value by 47%.