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The Fermi-age theory is used to describe the slowing down of neutrons in a moderating medium, particularly in systems where absorption is weak. It provides a statistical description of how fast neutrons lose energy through scattering until they reach thermal energies. The theory assumes isotropic scattering and treats the neutron slowing down as a diffusion-like process in energy space. In a weakly absorbing medium, the neutron balance in energy can be written in terms ________ _______ __________ _______ ____ ___ ______ _________.
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