The Landau-Placzek ratio is a term used in the field of scattering theory, particularly in the context of neutron scattering and other types of spectroscopy. It describes the relationship between the scattering cross-sections of different mechanisms involved in a scattering process. Specifically, the Landau-Placzek ratio is defined as the ratio of the coherent and incoherent contributions to the total scattering. In the context of neutron scattering, these contributions arise from the different ways neutrons interact with a sample.
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