Bethe phase variation due to a non-exponential nuclear amplitude and the possibility of using a $t$-dependent phase to determine the $\rho$-parameter from elastic scattering data

P. Grafstrom, M. G. Ryskin

We evaluate the possible deviation (from the conventional Cahn's result) of the phase between the one-photon-exchange and the `nuclear' high energy $pp$ scattering amplitudes in a…