  The equations for spin evolution of a particle in a storage ring are obtained
considering contributions from the tensor electric and magnetic
polarizabilities of the particle along with the contributions from spin
rotation and birefringence effect in polarized matter of an internal target. %
Study of the spin rotation and birefringence effects for a particle in a high
energy storage ring provides for measurement both the spin-dependent real part
of the coherent elastic zero-angle scattering amplitude and tensor electric
(magnetic) polarizabilities.
