Resonant neutron scattering lengths
1Advanced Photon Source Argonne National Laboratory 9700 South Cass Avenue Lemont IL60439-4814 USA.
Abstract:
Unlike most of the periodic table, many rare-earth elements display considerable resonant scattering for thermal neutrons. Although this property is accompanied by strong neutron absorption, modern high-intensity neutron sources make diffraction experiments possible with these elements. Computation of scattering intensities is accomplished by fitting the variation in resonant scattering lengths (b 0, b' and b'') to a semi-empirical Breit-Wigner formalism, which can be evaluated over the range of neutron energies useful for diffraction, typically E = 10-600 meV; λ = 0.4-2.8 Å (with good extrapolation to longer wavelengths).
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