Nuclear fission, where a large atomic nucleus (such as that of uranium) is split into two (or sometimes more) smaller nuclei.
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Extracting the rods to a calculated height allows the reactor to reach criticality — the point at which the nuclear fission reactions reach a self-sustaining level.
He immediately took Sands to the library to read Robert Serber's primer, which introduced him to the basic physical principles of nuclear fission, as they were known at the time, and their implications for nuclear weapon design.
When Consumers Power announced their intentions to build the Palisades Nuclear Generating Station on the shoreline of Lake Michigan in 1967, Mary Sinclair's background in nuclear fission technology prompted her to write a letter to the editor questioning the safety of several elements of their plan.
In 1987, the World Commission on Environment and Development(WCED), an organization independent from, but created by, the United Nations, published Our Common Future, in which a particular subset of presently operating nuclear fission technologies, and nuclear fusion were both classified as renewable.
Prompt critical, in nuclear engineering, the state of an assembly when for each nuclear fission event, one or more of the immediate or prompt neutrons released causes an additional fission event
Prompt neutron, in nuclear engineering, a neutron immediately emitted by a nuclear fission event, as opposed to a delayed neutron
the Chicago Pile-1, the world's first artificial nuclear fission reactor.