On the Thermal Neutron Transport Processes in Liquid H₂O-D₂O Mixtures

Using the recently developed thermal neutron scattering kernels for water and heavy water, which incorporate both the collective and the molecular modes present in water and heavy water, the thermal neutron transport studies of asymptotic decay constants λ₀, diffusion coefficient D₀, diffusion cooling coefficient C, and the transport mean-free-path _tr are studied for liquid H₂O-D₂O mixtures with varying molecular contents and for various assembly sizes at 21 and 5°C. The calculated values of the physical constants, λ₀, D₀, C, and _tr are found to be in good agreement with the corresponding experimental results. Both the collective motion and the molecular modes present in the liquid H₂O-D₂O mixtures play significant roles in the thermal neutron transport processes.