i) What is the difference between slowing down density and flux of neutrons? 

ii) If the reference neutron energy is 10 MeV, calculate the lethargy at 200 keV, and 0.025 eV?

i) The slowing down density and the flux of neutrons are related but distinct concepts in reactor physics.

• Slowing down density refers to the rate at which neutrons lose their energy as they interact with the medium, typically the fuel or moderator. It is a measure of the number of neutrons per unit energy range that are undergoing energy reduction (slowing down). This term is used to ____ _________ ____ ____ __________ ___ ____ _____ _______ ________ _______.
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