Abstract
Differential elastic cross sections in He + - He collisions, measured in the impact energy range 680–3100 eV (in Laboratory coordinates) are reported here. The oscillation pattern appearing on the σ(θ) curves has been explained theoretically [1] by potential and nuclear symmetries of the He +He system. These oscillations were first observed by D.C. Lorents and W. Aberth [2] and related to the oscillations of the symmetric charge exchange probability measured in a large energy range (130 eV – 100 keV) by E. Everhart et al. [3]. The location of minima and maxima that we have obtained is in very good agreement with the results given by these authors.
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