Spin rotation and depolarization in the 2H(p vector,p vector)2H reaction and the double-spin-flip part of the NN amplitude

It is shown that a specific set of measurements involving elastic scattering of polarized protons from an unpolarized deuterium target should furnish very useful, selective information on the p-d elastic collision matrix. The possibility of isolation of two observables which depend strongly on the double-spin-flip N-N amplitudes is discussed. The experimental study of the energy dependence of these observables could yield valuable information on the resonant behaviour of the p-p and p-n amplitudes. (orig.)