Abstract
Following a method originally due toSaavedra, van Kampen's causality condition for scattering by complex potentials was derived. Together with this problem, both Wigner inequality and Levinson theorem are also discussed in the context of scattering by regular and singular complex potentials.
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John Simon Guggenheim Fellow and on leave of absence from the University of Rochester, N.Y., USA.
One of us (S. O.) would like to express his gratitude to ProfessorAbdus Salam and P.Budini as well as the IAEA for the hospitality extended to him at the ICTPT. He is also indebted to Professor A. B.Zahlan for the hospitality given to him at the American University of Beirut where most of this work was done.
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Aly, H.H., Okubo, S. Derivation of the van Kampen's causality condition for complex potentials and related problems. Z. Physik 200, 20–28 (1967). https://doi.org/10.1007/BF01326079
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DOI: https://doi.org/10.1007/BF01326079