ar X iv : n uc l - th / 9 80 50 26 v 1 1 4 M ay 1 99 8 BACKWARD ELASTIC p 3 He - SCATTERING AND HIGH MOMENTUM COMPONENTS OF 3 He WAVE FUNCTION

It is shown that owing to a dominance of np−pair transfer mechanism of backward elastic p 3 He-scattering for incident proton kinetic energies T p > 1 GeV the cross section of this process is defined mainly by the values of the Faddeev component of the wave function of 3 He nucleus, ϕ 23 (q 23 , p 1), at high relative momenta q 23 > 0.6GeV /c of the NN-pair in the 1 S 0 − state and at low spectator momenta p 1 ∼ 0 − 0.2 GeV/c. The cross section of backward elastic p 3 He-scattering at the kinetic energy of incident proton T p > 1 GeV displays three remarkable peculiarities [1, 2]. (i) In the Born approximation only one mechanism of the process p 3 He → 3 Hep dominates, it is the so-called sequential transfer (ST) of the noninteracting np-pair. The contribution from the mechanisms of nonsequentional transfer (NST), interacting np-pair transfer (IPT) and deuteron exchange is negligible. The heavy particle stripping mechanism was also investigated in Refs. [3]-[5] and found to be important at back angles for T p ≤ 0.6 GeV. However the phenomenological 3 He wave functions restricted to the two-body configuration , which does not permit of ST-mechanism were used in that analysis. (ii) The most important role in the Faddeev wave function ϕ 23 (q 23 , p 1) of 3 He plays the channel with the orbital momentum L = 0, spin S = 0, isotopic spin T = 1 of two nucleons with numbers 2 and 3 and the orbital momentum l = 0 of nucleon spectator with number 1 (it 1