Phase Shifts and Mixing Parameters for Elastic Neutron-Deuteron Scattering Above Breakup Threshold

Abstract.

Complex eigenphases and mixing parameters for elastic n-d scattering above the breakup threshold are calculated. Faddeev equations are solved precisely using the Bonn-B NN potential. We point out defects in existing N-d phase-shift analyses. Peculiar energy variations in the mixing parameter η^3/2− are shown to have no effect on observables and are simply an artifact of the S-matrix parametrization. It is shown, that the n-d analyzing power A _y depends most sensitively on the three eigenphases δ^1/2 _3/2/1, δ^2/3 _3/2/1, and δ^5/2 _3/2/1, which again are predominantly generated by the ³ P _j NN force components. Therefore a determination of those eigenphases from experimental data would help to constrain the ³ P _j NN forces.