Polarization rotation of slow neutrons because of parity nonconservation in a nuclear interaction
Shapiro I.S.
The spin of a neutron will rotate in the plane of its wave vector in a homogeneous medium as a result of parity-nonconserving inelastic processes. The change in the spin component along the momentum is given by a single-parameter Lorentz transformation with a rapidity proportional to the path length in the medium and to a quantity that determines the helical dichroism.