delayed neutrons

https://doi.org/10.1351/goldbook.D01581
Neutrons emitted by @F02400@ formed by @N04227@ (the observed delay is due to the preceding @N04227@ or decays).
Source:
PAC, 1982, 54, 1533. (Glossary of terms used in nuclear analytical chemistry (Provisional)) on page 1546 [Terms] [Paper]