Abstract
On the basis of T invariance, it is established that the dependence of the effective cross section for a binary reaction of the a+b → c+d type on the polarization vectors of primary particles a and b determines completely the polarization vectors and spin correlations for the same particles in the inverse reaction c+d → a+b induced by collisions between unpolarized primary particles c and d. By using the formalism of helicity amplitudes, polarization effects are studied in the process p+3He → π++4He and in the inverse process π++4He → p+3He. It is shown that, in the reaction π++4He → p+3He, the spins of the final-state particles (proton and 3He nucleus) are strongly correlated. An expression for the correlation tensor is obtained for arbitrary values of the (p, 3He) emission angle.
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