Last Updated
：2025/12/06
prompt neutron
Noun
Japanese Meaning
原子核分裂により即座に生成される中性子。核分裂直後に放出され、通常は数秒から数分後に放出される遅発中性子と区別される。
（ plural ）
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(nuclear physics) A neutron produced immediately by the fission of an atomic nucleus, instead of being emitted by decaying fission products seconds to minutes later; over 99% of all fission neutrons are prompt neutrons (the exact proportion depends on the nuclide undergoing fission).
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prompt neutron
A single prompt neutron from a fission event can significantly affect the reactor's neutron population if conditions are near critical.
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A single prompt neutron from a fission event can significantly affect the reactor's neutron population if conditions are near critical.
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