Neutron thermalization in water using spherical geometry

Validation of Thermal Scattering Laws for Light Water at Elevated Temperatures With Diffusion Experiments

“…Therefore, the "correct" value for ‫ܤ‬ ଶ is the value that reproduces the physical ߙ in a real homogeneous system with material properties ܽ ୣ , ‫ܦ‬ ୣ , ‫,ܥ‬ etc. Likewise, the "correct" ‫ݖ‬ in any standard-geometry ‫ܤ‬ ଶ formula is that which yields the "correct" ‫ܤ‬ ଶ[54].The treatment of ‫ݖ‬ and ‫ܤ‬ ଶ in PNDA experiments have been the subject of considerable study[24,[54][55][56][57][58], including for light water and for spherical systems. The appropriate ‫ݖ‬ is a function of material density, material scattering and absorption properties, and geometry.…”