On Precessing Spin Neutron Reflectometry

The spin operator at a point, σ ( r ) ≡ σ δ( r' – r ), is defined for analysis of behavior of the neutron polarization vector. Polarization of neutrons in a two-level state that traverse regions with magnetic field without being scattered is described in terms of pilot velocity, precession front, nutation and dynamic axes. A scheme of reflectometry of neutrons in two-level states (precessing spin neutron reflectometry) is suggested for a more detailed study of magnetic layered structures.