Sensitivity of Low-Energy Three-Body Properties to the Off-Shell Two-Body t Matrix

Direct modifications are made to the off-shell two-body t matrices which are used as input to the Faddeev-Lovelace equations for the three-body bound state and for scattering below breakup. The t matrices are modified when either momentum argument exceeds a particular value, in a manner which will maintain off-shell unitarity when it is important. In this way, we are able to test the dependence of these three-body properties on different regions of the off-shell momenta. We find a strong sensitivity for both momenta less than 2 fm^-1; weak, potential-dependent sensitivity when either argument is between 2 and 5 fm^-1, and essentially no dependence if either argument exceeds 5 fm^-1.