nuclear level
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https://doi.org/10.1351/goldbook.N04235
One of the energy values at which a nucleus can exist for an appreciable time (> 10E-22 s).
Source:
PAC, 1982,
54
, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1547 (https://doi.org/10.1351/pac198254081533)