Cyclotron Plutonium Fission Rate
Using cyclotron-produced plutonium, Segre measures a spontaneous-fission rate low enough to keep the plutonium gun concept viable at this stage.
Historical biography archive · Updated 2026-11-03
Emilio Gino Segre Biography and Timeline
Follow Emilio Gino Segre through 3 dated historical records for Italy.
Emilio Gino Segre, historical timeline
A chronological timeline drawn from matching World History Database records.
3Distinct records
1 of 1Page
1943–1944Years on this page
1943
Uranium-235 Spontaneous Fission Measurement
Segre measures a lower-than-expected spontaneous-fission rate for uranium-235, easing design requirements for the uranium gun weapon.
1944
Reactor Plutonium High Fission Rate
Measurements of reactor-produced plutonium show a spontaneous-fission rate far above expectations because of plutonium-240 contamination, threatening the gun method.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.