Abstract
We present a critical comparison of the two distinct formulations of the nuclear direct interaction theory in which either the asymptotic channels or interacting composite states are emphasized. In the truncated bound-state approximation, they reduce to the channel coupling array (CCA) and coupled reaction channel (CRC) approaches. The unique role played by the distortion potentials Y in the CCA method is studied, and the importance of the non-orthogonality terms in the CRC is pointed out. To incorporate the advantages of both formulations, introduction of an auxiliary reactive channel to the matrix equation was proposed previously, and the structure of this modified set of scattering equations is analyzed in detail.
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