Why Don't Light Nuclei Undergo Spontaneous Fission?

EDerkatch
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Could someone please explain why relatively light nuclei do not undergo spontaneous fission? Thanks.
 
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The radius of the nucleus has to be large enough so that a slight perturbation will make the
Coulomb repulsion overcome the nuclear attraction.
 
EDerkatch said:
Could someone please explain why relatively light nuclei do not undergo spontaneous fission?

But some do. 8Be, for example.
 

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