Accurate values for wavelength-dependent neutron scattering lengths of 141Pr, 152Sm, 154Sm, 153Eu and natEu
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 for the determination of bcoh(j), in order to improve the accuracy of bcoh(j) values for some important isotopes, 141Pr, 152Sm, 154Sm, 153Eu and the natural isotopic mixture of europium, natEu. This will provide the user community with fundamentally important data needed for a plethora of neutron experiments. The determination relies on relative Bragg reflection intensities and is very robust as for systematic errors. To further minimize the latter, each sample (2.0 g 141PrN, 1.5 g 152SmN, 1.5 g 154SmN, 1.5 g 153EuN, 2.0 g natEuN) will be measured at two diffractometers, D20 and D4, using three wavelengths, which will also address the wavelength dependence of bcoh(natEu). Lanthanide nitrides LnN have been chosen because of their simple rocksalt-type crystal structure without free positional parameters.
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Holger Kohlmann; Henry E. Fischer; Florian Gehlhaar and Thomas C. Hansen. (2021). Accurate values for wavelength-dependent neutron scattering lengths of 141Pr, 152Sm, 154Sm, 153Eu and natEu. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-10-48
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