  Particles scattered off the nuclear target acquire a polarization if the
nuclei have a non zero analyzing power. This effect is enhanced when particles
traverse a bent crystal. Such enhancement under certain assumptions allows one
to measure the analyzing power at the level of 10^-4 at the square of transfer
momentum |t| < 10^-5 (GeV/c)2. If it happens that the analyzing power is big
enough, then one can get the beam polarization more than 50% after extraction
of the primary beam with the bent crystal.
