Relations between Spin Observables of the Reactions dd → npd and pd → pd in the Impulse Approximation

We have shown that the vector and tensor analyzing powers $${{A}_{y}}$$ , $${{A}_{{yy}}}$$ and also double spin correlation coefficients $${{C}_{{y,y}}}$$ , $${{C}_{{yy,y}}}$$ of the reaction $$dd \to n + p + d$$ in the impulse approximation are linearly connected to the corresponding observables of the $$pd$$ -elastic scattering. The obtained relations are necessary for motivation of the polarization experiments for the first phase of the SPD NICA project and for analysis of expected data.