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Beschreibung:
The mechanism of p He-3 backward elastic scattering is studied. It is found that the triangle diagrams with the subprocesses pd-->He-3 pi(0), pd*-->He-3 pi(0), and p(pp)-->He-3 pi(+), where d* and pp denote the singlet deuteron and diproton pair in the S-1(0) state, respectively, dominate in the cross section at 0.3-0.8 GeV, and their contribution is comparable with that for a sequential transfer of a np pair at 1-1.5 GeV. The contribution of the d*+pp, estimated on the basis of the spectator mechanism of the p(NN)-->He-3 pi reaction, increases the p He-3-->He-3 p cross section by one order of magnitude as compared to the contribution of the deuteron alone. Effects of the initial and final states' interaction are taken into account.