Distorted Wave Approximation for Scattering Phase-Shifts

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THE elastic scattering wave-function for a short-range potential function V(r) may be written in the form : where j l(x) and n l(x) are the spherical Bessel and Neumann functions respectively, δl is the scattering phase-shift, and g l(r) is a form factor measuring the distortion of the incident wave by the potential. g l(r) must satisfy the boundary conditions

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SWAN, P. Distorted Wave Approximation for Scattering Phase-Shifts. Nature 187, 585–586 (1960) doi:10.1038/187585a0

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