United States Citizenship
Becomes a naturalized citizen of the United States together with his wife Laura Fermi.
Historical biography archive · Updated 2026-11-03
Enrico Fermi Biography and Timeline
Follow Enrico Fermi through 19 dated historical records for United States of America.
Enrico Fermi, historical timeline
A chronological timeline drawn from matching World History Database records.
19Distinct records
1 of 1Page
1944–1954Years on this page
1944
B Reactor Uranium Loading
Participates in startup work at Hanford as uranium loading begins in B Reactor, the first full-scale plutonium-production reactor.
Los Alamos F Division Leadership
Leads a Los Alamos division concerned with advanced theoretical and experimental problems related to neutron physics and weapon development.
Move to Los Alamos
Moves to Los Alamos and joins the laboratory effort to solve scientific problems associated with designing the first atomic weapons.
1945
Trinity Test Observation
Observes the Trinity nuclear test and performs a simple paper-drop experiment to make an immediate estimate of the explosion's yield.
Interim Committee Scientific Panel
Serves on the scientific panel advising the Interim Committee on issues concerning the wartime use and postwar implications of atomic energy.
1946
Postwar Nuclear Physics Programme
Establishes an energetic postwar research programme at Chicago spanning nuclear physics, particle physics and theoretical problems.
University of Chicago Professorship
Accepts a professorship at the University of Chicago's Institute for Nuclear Studies and returns to fundamental research after the war.
1947
Cosmic Ray Research
Studies high-energy cosmic-ray interactions and develops theoretical models for how energetic particles produce secondary particles in the atmosphere.
1948
Particle Acceleration Theory
Develops ideas explaining how charged particles can gain energy through repeated interactions with moving magnetic fields in astrophysical environments.
1949
Fermi Acceleration Mechanism
Publishes a theory of stochastic particle acceleration that later becomes known as second-order Fermi acceleration.
1950
Pion Nucleon Scattering Research
Uses the Chicago cyclotron to investigate pion-nucleon interactions and helps establish important experimental results in emerging particle physics.
1951
High Energy Particle Experiments
Continues high-energy experiments with mesons and nucleons, combining rapid estimates with detailed measurements to test models of particle interactions.
1952
Fermi Pasta Ulam Work
Collaborates with John Pasta and Stanislaw Ulam on numerical studies of nonlinear coupled oscillators that later become foundational in nonlinear dynamics.
1953
Final Chicago Research Programme
Continues teaching and conducting research at the University of Chicago while advising younger physicists on nuclear and particle physics problems.
1954
Death of Enrico Fermi
Enrico Fermi dies in Chicago on 28 November 1954 after a career that transformed quantum statistics, nuclear physics and reactor science.
Reactor Science Legacy
Leaves a lasting reactor-science legacy through the experimental methods, neutron calculations and controlled-chain-reaction work that helped establish nuclear engineering.
Last Scientific Lectures
Continues lecturing and discussing current problems in physics during the final year of his life despite declining health.
Legacy in Nuclear and Particle Physics
Leaves a scientific legacy spanning quantum statistics, beta decay, neutron physics, controlled chain reactions, particle acceleration and high-energy physics.
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.