Number of Neutrons Liberated in the Nuclear Fission of Uranium

@article{Halban1939NumberON,
  title={Number of Neutrons Liberated in the Nuclear Fission of Uranium},
  author={H. Halban and F. Joliot and L. Kowarski},
  journal={Nature},
  year={1939},
  volume={143},
  pages={680-680}
}
RECENT experiments have shown that neutrons are liberated in the nuclear fission of uranium induced by slow neutron bombardment: secondary neutrons have been observed which show spatial1, energetic2 or temporal3 properties different from those which primary neutrons possess or may acquire. Such observations give no information on the mean number of neutrons produced per nucleus split; this number v may be very small (less than 1) and the result of the experiment will still be positive. 
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References

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Liberation of Neutrons in the Nuclear Explosion of Uranium
RECENT experiments1,2 have revealed the existence of a new kind of nuclear reaction: neutron bombardment of uranium and thorium loads to an explosion of the nucleus, which splits up into particles ofExpand
Über die Umwandlungsreihen des Urans, die durch Neutronenbestrahlung erzeugt werden
ZusammenfassungIn einer Reihe vorangehender Arbeiten ist gezeigt worden, daß die Bestrahlung von Uran mit Neutronen zu drei neuen Umwandlungsreihen führt, deren einzelne Glieder zum größten TeileExpand