The present calculation, devoted to p r ~t o n -~H e elastic scattering at 800 MeV, is the first to achieve good agreement with experimental data for polarization P and spin rotation parameters &, S, starting from an accurate knowledge of the basic nucleon-nucleon amplitudes. We have studied the influence of A p r o p agation in the intermediate steps of multiple scattering and the phase variation of the nucleon-nucleon amplitudes with momentum transfer. Both effects play an important role. Our phase value confirms the positive one of Franco and Yin. The A production is treated in the full generality of their 16 spin-independent amplitudes. General formulae are derived to test the NA elastic scattering within the nucleus.
The polarization structure of the N N + A N transition is presented in a very compact way using two kinds of formalisms. First, the spin-space decomposition adapted for describing Bohr's rules is recalled. Second, the optimal formalism is applied to the transition. It is adapted for taking into account Bohr's relations and explicitly developed in lielicity and transversity frames. Tables of transforlnation are given which simply relate observables defined in different formalisms. PACS number(s): 13.75.Cs, 13.88.+e
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