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In a molten salt reactor, a common type of neutron moderator is lithium fluoride salt that is enriched with lithium-7. How many neutron scattering

In a molten salt reactor, a common type of neutron moderator is lithium fluoride salt that is enriched with lithium-7. How many neutron scattering events with lithium-7, on average, are needed for a 1.0 MeV neutron to reach an average energy of 2.0 keV? Final answer must be the number (n) of total scattering events required rounded to 3 significant figures.

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