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Let q(r) , r = |x| , x ∈ R 3 , be a real-valued square-integrable compactly supported function, and [0, a] be the smallest interval containing the support of q(r). Let A(α , α) = A(α · α) be the corresponding scattering amplitude at a fixed positive energy, k 2 = 1. Let δ be the phase shifts at k = 1. It is proved that lim →∞ 2 + 1 e |δ | 1 2 = a , provided(More)
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