Statement of a problem № 11268


Neutrons released by a fission reaction must be slowed by collisions with the moderator nuclei before the neutrons can cause further fissions. Suppose a 1.5-MeV neutron leaves each collision with 65% of its incident energy. How many collisions are required to reduce the neutron s energy to at least 0.040 eV, which is the energy of a thermal neutron?

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