The off-shell properties of two-nucleon t matrices are studied for both uncoupled and coupled channels. Complex t matrices have been obtained using both matrix inversion and continued fraction techniques of solution and predicated upon a standard phenomenological form (Reid), a meson exchange model (Paris), and a new phenomenological form that we have developed, of the two-nucleon interaction. The off-shell t matrices from these interactions are very similar whenever they give essentially the same phase shifts at all energies. When they do not, the associated off-shell t matrices diverge so substantially that any data depending upon these off-shell t matrices will differentiate between the interactions.
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Amos et al. (1988) studied this question.
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