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P.E. Elective (3-5) "Fission of Heavy Nucleus" ppt 1. Definition: In physics, when a heavy nucleus is split into two or more lighter nuclei, the reaction to release nuclear energy is called nuclear fission. 1) Discovery In December 1939, the German physicist Hahn and his assistant Strassmann discovered that the uranium nuclei had undergone fission when bombarded with neutrons. 2) Fission products (various)

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