A Rule for Determining Fissile Isotopes
Nuclear Science and Engineering / Volume 152 / Number 3 / March 2006 / Pages 334-335
Technical Note / dx.doi.org/10.13182/NSE06-A2588
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Heavy isotopes with 90 
Z 100 and 2Z - N = 43 ± 2, with some exceptions, are fissile.
