Backward elastic p 3He scattering at energies 1–2 GeV

The two-body transfer amplitude for the rearrangement process i + {jkl} → j + {ikl}is constructed on the basis of technique of four-dimensional covariant nonrelativisitic graphs. The developed formalism is applied to describing backward elastic p 3He scattering in the energy range 0.5–1.7 GeV. Numerical calculations performed using the 5-channel wave function of the 3He nucleus show that the transfer of a noninteracting np-pair dominates and explains satisfactorily the energy and angular dependence of the differential cross section at energies 0.9–1.7 GeV. A weak sensitivity to high momentum components of the 3He wave function, in spite of large momentum transfer as well as a very important role of rescatterings in the initial and final states, are established.