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stable nucleus

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stable nucleus [′stā·bəl ′nü·klē·əs]
(nuclear physics)
A nucleus which does not spontaneously undergo radioactive decay.


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The fission fragments produced when the uranium nuclei split are highly radioactive and emit alphaparticles and beta and gamma rays until finally a stable nucleus is formed.
In fusion, two atomically light nuclei -- such as the hydrogen isotopes deuterium and tritium -- merge into a heavier, more energetically stable nucleus.
Then the lighter element decays to something still lighter, and so on until the chain reaches a stable nucleus.
 
 
 
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