Abstract
Fast neutrons. Slowing down by elastic scattering. Placzek transients. Resonances. The Doppler effect. Thermalization. Wigner- Wilkins, Nelkin model, Cadilhac model, influence of leakage, THERMOS. Validation and verification.
Keywords: Slowing down; Placzek transients; resonances; Doppler effect; thermalization models; leakage.