Abstract
This chapter provides an overview of polarized neutron scattering. For a measurement of the polarization dependence of cross sections, various techniques for producing and analyzing polarized neutron beams have been developed. Depending on the required phase space properties of the beams—continuous vs. pulsed, energy, divergence, and type of detector—different methods for the spin analysis are used. The most common methods are diffraction from single-crystal polarizers, reflection from magnetized thin film multilayers or supermirrors, and absorption of the nonwanted spin state by means of polarized 3He. A major drawback of polarizing single crystals and thin films is their decreasing efficiency with increasing neutron energy. They are maintenance-free and easy to use. Therefore, polarizing filters with broadband characteristics and minor restrictions on divergence are of significant interest for neutron scattering in particular for pulsed spallation sources and spectrometers with large area detectors. Polarized neutrons make it possible to measure magnetic densities with improved accuracy as compared to that of standard diffraction methods.
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