Equilibrium Spectra and Diffusion Lengths of Neutrons in Semi-Infinite Moderator Block: Part II: Effect of ‘Trapped’ and Cold Neutrons

In a semi-infinite block of beryllium at room temperature, the effect of ‘trapped’ and cold neutrons on the asymptotic equilibrium neutron flux distribution and on diffusion length is investigated by considering various forms for the energy dependence of the transport cross-section. It is found that in static experiments, cold neutrons play a dominant role. The effect of non-l/v absorbers on the above properties has also been studied.