Multiple-scattering effects on smooth neutron-scattering spectra

Elastic and inelastic incoherent neutron-scattering experiments are simulat ed for simple models: a rigid solid (as used for normalization), a glass (w ith a smooth distribution of harmonic vibrations), and a viscous liquid (de scribed by schematic mode-coupling equations). In cases where the input sca ttering law factorizes into a wave-number-dependent amplitude and a frequen cy-dependent spectral distribution, the latter is only weakly affected by m ultiple scattering, whereas the former is severely distorted.