Different sets of phase shifts for the same differential cross section and polarization in spin-0−spin-12 elastic scattering

It is shown by construction that different sets of phase shifts exist, giving the same cross section and polarization for elastic $\text{spin}\text{-0?}\text{spin}\text{-}\text{1}\text{2}$ scattering. All possible cases for S-P wave scattering are constructed. Measurement of the R- and A-paraameters resolves the ambiguities.