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The modified convolution approximation model for neutron scattering from short range ordered paramagnets
Author(s) -
Rao L. Madhav
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220500236
Subject(s) - neutron scattering , neutron , spectral line , scattering , convolution (computer science) , physics , range (aeronautics) , condensed matter physics , small angle neutron scattering , paramagnetism , quasielastic neutron scattering , line (geometry) , computational physics , materials science , nuclear physics , optics , quantum mechanics , mathematics , geometry , machine learning , artificial neural network , computer science , composite material
Abstract A modified convolution approximation model is developed to explain neutron scattering from short range ordered paramagnets, employing the concepts used in understanding neutron scattering of simple liquids. Calculations based on this model are compared with the following experimental results in paramagnetic MnO: (1) scattered neutron energy spectra at room temperature, using the triple‐axis spectrometer, (2) scattered neutron time‐of‐flight spectra at 124, 143, and 298 °K. The model explains satisfactorily the narrowing of the line shape observed in (1) and also explains qualitatively the observed energy shifts in (2), at all the three temperatures without assuming spin‐wave like excitations. These apparent energy shifts are explained to arise essentially from the “non‐constant Q ” nature of the measurements.