Nuclear fission - Stages, Reactions, Energy: A pictorial representation of the sequence of events in the fission of a heavy nucleus is given in Figure 3. The approximate time elapse between stages of the process is indicated at the bottom of the Figure. When a heavy nucleus undergoes fission, a variety of fragment pairs may be formed, depending on the distribution of neutrons and protons.. However, a third neutron produced from the initial collision can collide with more U -235, and continue the chain reaction to produce more neutrons. Figure 24 6 2: Fission reaction with U -235. Typical nuclear fission reactions balance in terms of mass. The total mass of the reactants is equal to the total mass of the products:
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Schematic of a nuclear fission chain reaction, where released neutrons trigger further fission events.
. Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay. Nuclear fission was discovered by chemists Otto Hahn and Fritz Strassmann and physicists Lise Meitner and Otto Robert Frisch. Hahn and Strassmann.