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Forward scattering of 4·75 }5 neutrons in hydrogenous liquids
Author(s) -
Boyer W.,
King J. S.
Publication year - 1988
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889888004078
Subject(s) - scattering , chemistry , deuterium , neutron scattering , toluene , physics , analytical chemistry (journal) , materials science , molecular physics , computational physics , nuclear physics , optics , chromatography , organic chemistry
Small‐angle scattering measurements from protonated polystyrene (PSH) and mixtures of deuterated and protonated toluene (C 7 D 8 and C 7 H 8 ) are presented. The data are compared with the simple `quasi‐isotropic' Vineyard model, corrected for third‐ and higher‐order multiple scattering by Monte Carlo methods. This model agrees surprisingly well with all protonated samples over the total thickness range considered. The empirical Jacrot g factor in the expression I ( Q ) = K (1 − T ) g ( λ )/4 π works well over a more limited thickness range. The effective differential cross section can be calculated using Melkonian total cross sections, and this gives an absolute scattered intensity which is 9% lower than a calibration performed at Oak Ridge National Laboratory. Scattering from oversize samples must be back shielded. The model requires an anisotropic kernel to predict D/H toluene mixtures.