spontaneous fission
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https://doi.org/10.1351/goldbook.S05887
nuclear fission which occurs without the addition of particles or energy to the nucleus
Source:
PAC, 1982,
54
, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1542 (https://doi.org/10.1351/pac198254081533)