Magnetic Neutron Scattering and Spin-Polarized Neutrons

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For C C, only spin-up neutrons are reflected:ferromagnetic mirrornonmagnetic filmsmagnetic filmsNeutron reflectivity from nonmagnetic and magnetic filmshttp://www.orau.org/council/02presentations/klose.pdfFerromagnetic “supermirrors” with larger critical angles (see chapter on neutronreflectivity) are commonly used to produce spin-polarized neutrons in modernneutron scattering instruments:Polarized-beam reflectometerhttp://www.orau.org/council/02presentations/klose.pdf8
2 A method that has been developed in the past few years is the neutron spinfilter. A spin-polarized 3 He gas absorbs neutrons through the reaction3 4 3n He He ( S 0) pH .H 3 HeBecause the reaction proceeds via an intermediate state with S 0 , theabsorption cross section for neutrons with spins antiparallel to those of the3 Henuclei is therefore about three orders of magnitude larger than if neutron and3 He spins are parallel.9
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Magnetic Neutron Scattering and Spin-Polarized Neutrons

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