BACKWARD ELASTIC p 3He-SCATTERING AND HIGH MOMENTUM COMPONENTS OF 3He WAVE FUNCTION

It is shown that owing to a dominance of np−pair transfer mechanism of backward elastic p Hescattering for incident proton kinetic energies Tp > 1 GeV the cross section of this process is defined mainly by the values of the Faddeev component of the wave function of He nucleus, φ(q23,p1), at high relative momenta q23 > 0.6GeV/c of the NN-pair in the S0− state and at low spectator momenta p1 ∼ 0− 0.2 GeV/c. PACS numbers: 25.10.+s, 25.40.Cm, 21.45.+v The cross section of backward elastic p He-scattering at the kinetic energy of incident proton Tp > 1 GeV displays three remarkable peculiarities [1, 2]. (i) In the Born approximation only one mechanism of the process pHe → 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 Tp ≤ 0.6 GeV. However the phenomenological 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(q23,p1) of 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