3181.     SHULL, C. G.  Production of Highly Polarized Neutron Beams by Bragg Reflection From Ferromagnetic Crystals.  Phys. Rev., vol. 81, 1951, p. 626; Chem. Abs., vol. 45, 1951, p. 4,517.

        Monochromatic beam of neutrons (λ=1.204 A) was reflected from the (220) planes of a magnetized slice of crystalline Fe₃O₄ with the slice set in transmission orientation and with the magnetization vector perpendicular to the plane of scattering.  The reflected beam was polarized to 100 ±5%.