Accurate neutron scattering lengths of 6Li, 148Sm, 154Sm, 153Eu, 156Gd, and 203Tl
The bound coherent neutron scattering length, bcoh(j), is one of the most basic properties of isotopes and of fundamental importance in many areas of neutron science. Tabulated scattering lengths have sometimes low accuracy (> 5% error) and / or rely on a single measurement only. The scope of this proposal is to make use of neutron powder diffraction, a technique that has been underexploited for the determination of bcoh(j), in order to improve the accuracy of bcoh(j) values for some important isotopes, 6Li, 148Sm, 154Sm, 153Eu, 156Gd, and 203Tl, and thereby provide the user community with fundamentally important data needed for a plethora of neutron experiments. The determination relies on relative Bragg reflection intensities without the need to normalize to an absolute scale. The packing density of samples, exact dimensions or weight – important parameters for other techniques of bcoh(j) determination - do not play any role either. To exclude systematic errors in the diffraction data used for Rietveld refinements, each sample (0.5 g 203Tl2O3, 1 g 6LiF, 1.5 g 148Sm2O3, 1.5 g 154Sm2O3, 1.5 g 153Eu2O3, 1.5 g 156Gd2O3) will be measured at two diffractometers, D2b and D20.
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Holger Kohlmann; Henry E. Fischer; Florian Gehlhaar and Thomas C. Hansen. (2020). Accurate neutron scattering lengths of 6Li, 148Sm, 154Sm, 153Eu, 156Gd, and 203Tl. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-10-46
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