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• W2079487027 abstract "The type of potential introduced by Schwinger in connection with quantum electrodynamics and adopted by Gupta for nucleon-nucleon interactions is being distinguished from the more usual type which is used in a Schrödinger equation involving the coordinates of interacting particles. The application of the Dyson S matrix expansion in terms of plane waves to the calculation of the collision matrix is justified by the consideration of wave packets. Explicit relationships between expressions occurring in Dyson's S in the usual notation and the collision matrix are listed and it is shown that a non-Hermitean potential can be written down which has the property of reproducing the scattering amplitude in first Born approximation. Explicit relations to the reactance matrix of nuclear reaction theory are listed and alternative procedures of calculating phase shifts and coupling parameters by means of the non-Hermitean potential are discussed. Relativistic correction factors are analyzed in a form distinguishing between factors occurring in general and those peculiar to pseudoscalar coupling for the second order potential. Attention is called in the concluding remarks to a formal similarity between the success of Dyson's S-operator expansion in quantum electrodynamics and the qualitative reproduction of phenomenological phase parameter fits by the S-operator in the nucleon-nucleon case." @default.
• W2079487027 created "2016-06-24" @default.
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• W2079487027 date "1961-12-01" @default.
• W2079487027 modified "2023-10-16" @default.
• W2079487027 title "On the interpretation of the field theoretical potential in terms of phase shifts" @default.
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• W2079487027 doi "https://doi.org/10.1016/0003-4916(61)90112-9" @default.
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