Multiple-scattering effects on incoherent neutron scattering in glasses and viscous liquids

摘要

Incoherent neutron scattering experiments are simulated for simple dynamicmodels: a glass (with a smooth distribution of harmonic vibrations) and aviscous liquid (described by schematic mode-coupling equations). In mostsituations multiple scattering has little influence upon spectraldistributions, but it completely distorts the wavenumber-dependent amplitudes.This explains an anomaly observed in recent experiments.