Assertion: atom's number | /r/HasProperty | reported at 3.5 per fission
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Source sentences:
text: But Joliot-Curie did not, and in April 1939 his team in Paris, including Hans von Halban and Lew Kowarski, reported in the journal Nature that the number of neutrons emitted with nuclear fission of 235U was then reported at 3.5 per fission.