The Mousetrap Reactor is a visual representation of a chain reaction in a confined space. Useful as an analogy for an uncontrolled nuclear reaction.
The UNCONTAINED Reaction!
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The splitting of a massive nucleus into two fragments, each with a smaller mass than the original is know as nuclear fission. A typical example of nuclear fission is the splitting of a Uranium-235 nucleus. This is a reaction that is used in nuclear reactors to generate heat by which steam is produced and used to turn turbines that generate electricity. The fission of Uranium 235 begins when the Uranium 235 captures a slow moving neutron and forms an unstable "compound nucleus". The compound nucleus quickly disintegrates into a Barium-141 nucleus, a Krypton-92 nucleus, two or three neutrons (2.5 average), and a tremendous amount of energy (~200MeV per fission).
Because the Uranium-235 fission reaction produces 2 or 3 neutrons, it is possible for it to initiate a series of subsequent fission reactions. Each neutron released can initiate another fission event, resulting in the emmission of more neutrons, followed by more fission events, and so on. This is a chain reaction - one event triggers several others, which in turn trigger more events, and so on. In a nuclear power plant the chain reaction is controlled by restricting the number of neutrons available to collide with the Uranium. This is accomplished by absorbing some of the released neutrons with various materials. In an uncontrolled chain reaction (such as an atom bomb explosion) there is nothing to control the number of neutrons being released, so the rate of the chain reaction increases dramatically.
Click here for instructions on how to build a Mouse Trap Reactor.