Geodesic
Phase-shift method for scattering on potentials that allow separation of variables in spheroidal coordinates
Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 2, pp. 253-259 
D. I. Abramov; I. V. Komarov. Phase-shift method for scattering on potentials that allow separation of variables in spheroidal coordinates. Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 2, pp. 253-259. http://geodesic.mathdoc.fr/item/TMF_1975_22_2_a10/
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     title = {Phase-shift method for scattering on potentials that allow separation of variables in spheroidal coordinates},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     volume = {22},
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     language = {ru},
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that angular functions arising in the separation of variables as well as the phases of corresponding radial functions represent the eigen-functions and phases of the unitary operator $SI$. The scattering amplitude and cross-sections are directly expressed in terms of these functions and phase shifts. Modified expansion for the amplitude is suggested for long-range potentials with the Coulomb behaviour at large distances.

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