Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction

@article{Meitner1939DisintegrationOU,
  title={Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction},
  author={L. Meitner and Otto Robert Frisch},
  journal={Nature},
  year={1939},
  volume={143},
  pages={239-240}
}
ON bombarding uranium with neutrons, Fermi and collaborators1 found that at least four radioactive substances were produced, to two of which atomic numbers larger than 92 were ascribed. Further investigations2 demonstrated the existence of at least nine radioactive periods, six of which were assigned to elements beyond uranium, and nuclear isomerism had to be assumed in order to account for their chemical behaviour together with their genetic relations. 
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AMONG the properties of atomic nuclei disclosed by the fundamental researches of Lord Rutherford and his followers on artificial nuclear transmutations, one of the most striking is the extraordinary
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We describe in this paper some further results on artificial radioactivity induced by neutron bombardment, which have been obtained in the physical Laboratory of the University of Rome, after the
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A general formula is developed for the probability of nuclear processes with particular consideration of resonance (\textsection{}2). The dependence of the cross section on the energy of the incident
Künstliche Umwandlungsprozesse bei Bestrahlung des Thoriums mit Neutronen; Auftreten isomerer Reihen durch Abspaltung von α-Strahlen
ZusammenfassungEs werden die bei der Bestrahlung von Thorium mit langsamen und schnellen Neutronen auftretenden Prozesse untersucht. Es zeigte sich, daß vier Umwandlungsreihen auftreten. Die eine
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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 Teile