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fission barrier

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fission barrier [′fish·ən ‚bar·ē·ər]
(nuclear physics)
One or more maxima in the plot of potential energy against nuclear deformation of a heavy nucleus, which inhibits spontaneous fission of the nucleus.
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This means that less energy is required to get through the fission barrier than for "ground state" nuclei sitting in the valley, and so the excited nuclei split up more easily.
Superdeformed nuclei go for a spin; physicists are head over heels ... by Weisburd, Stefi / Science News
 
 
 
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