A physicist.[ref]
https://www.nobelprize.org/nomination/archive/show.php?id=5348. Independent professional biography and identity
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James Chadwick (1891-1974) was a British physicist best known for his discovery of the neutron in 1932. His work was pivotal in advancing the understanding of atomic structure and nuclear physics. Chadwick's discovery provided crucial insights that contributed to the development of atomic models and later nuclear technology.