The applicability of the eikonal approximation to high-energy nucleon-nucleus and hadron-hadron collisions is limited to small angles of scattering. However, experimental results have in some cases been interpreted by applying this theory beyond its angular range of validity. In the present paper, an expression for the scattering amplitude is obtained that has much of the simplicity of the eikonal approximation, but a much greater angular range of application. It provides a natural explanation for the disagreement between the Brookhaven and Virginia data on high-energy proton-He⁴ elastic scattering in the neighborhood of the first minimum.
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L. I. Schiff (1968) studied this question.
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