An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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prompt neutrons
  نوترون‌های ِ تند  
notronhâ-ye tond (#)
Fr.: neutrons instantanés  

Neutrons emitted immediately by a nucleus undergoing fission, as opposed to → delayed neutrons, which are emitted by one of the fission products an appreciable time interval after the fission event (from a few milliseconds to a few minutes).

See also: → prompt; → neutron.