The connection between the matrix elements of direct nuclear reactions in the usual formalism, which employs wave functions, and in the diagrammatic approach is studied. In the case of stripping (capture), inelastic scattering, spallation, and double decay reactions and a specific choice of vertex functions in the diagrams, the matrix elements of these two methods are identical. The problem of what vertex functions should be used in the sequential diagrammatic approach is discussed.
Scientific Research Institute for Nuclear Physics
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