Transfer excitation reactions in fast proton-helium collisions

Continuing previous work, we have measured the projectile scattering-angle dependency for transfer excitation of fast protons (300--1200 keV$/$u) colliding with helium ($p\phantom{\rule{0.16em}{0ex}}+$ He $\ensuremath{\rightarrow}$ H $+$ He${}^{+*}$). Our high-resolution fully differential data are accompanied by calculations, performed in the plane-wave first Born approximation and the eikonal wave Born approximation. Experimentally, we find a deep minimum in the differential cross section around 0.5 mrad. The comparison with our calculations shows that describing the scattering-angle dependence of transfer excitation in fast collisions requires us to go beyond the first Born approximation and in addition to use the initial-state wave function, which contains some degree of angular correlations.

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