James Chadwick Biography and Timeline

Possible Existence of a Neutron

Publishes evidence that the penetrating beryllium radiation consists of neutral particles with roughly proton mass.

The Existence of a Neutron

Publishes a fuller experimental account establishing the neutron as a distinct nuclear particle.

Discovery of Neutron

Discovers the neutron, clarifying nuclear structure and explaining how isotopes of the same element can share an atomic number while differing in mass.

Neutron Mass Estimate

Uses recoil measurements from several light elements to estimate the mass of the newly identified neutron.

Nobel Prize for Neutron Discovery

Receives the Nobel Prize in Physics for the discovery of the neutron.

Nobel Prize

Receives the Nobel Prize in Physics for discovering the neutron, a neutral nuclear particle fundamental to understanding atomic nuclei.

MAUD Committee

Supports the MAUD conclusion on uranium weapon feasibility while based at Liverpool.

Role range: 1891-1974

British Mission to Manhattan Project

Chadwick helps lead the British scientific mission that travels to the United States to join Allied atomic-bomb work.