The global phase of the nucleon-nucleon amplitudes and proton-nucleus scattering

Evidence for a global phase variation of the nucleon-nucleon amplitudes has been investigated at intermediate energies in the elastic scattering of protons, deuterons, ³He and ⁴He. Extending previous works, we study the influence of this phase variation on the proton-nucleus scattering for heavier systems. As a specific example, calculations have been performed for p-¹²C elastic and inelastic scattering at 0.8 GeV. The present work being exploratory in nature, we simply used the Kerman, McManus and Thaler approximation(1959) to the optical potential.