Structure of 3He in backward elastic p- 3He scattering

Abstract

Backward elastic p- 3He-scattering at incident proton kinetic energies T p > 1 GeV is investigated in the framework of the np-pair transfer mechanism and triangular diagram of one-pion exchange with a subprocess pd → 3 Heπ 0 using a realistic three-body wave function of the 3He nucleus. It is found that the np-pair transfer mechanism dominates owing to a rich high momentum component of the 3He wave function. We show that the experimental cross section of this process is defined mainly by the values of the Faddeev component of the 3He wave function, ϕ 23( q 23, p 1), at high relative momenta q 23 > 0.6 GeV/ c of the NN-pair in the 1 S 0 state and at low spectator momenta p 1 ≤ 0.1 GeV/ c. The spin-spin correlation parameter is calculated in the framework of the dominating mechanism for the case of a polarized target and beam. Rescatterings in the initial and final states are taken into account. Comparison with the pd → dp process is performed.