research, Rutherford and Chadwick would suggest topics. He edited all the papers produced by the laboratory.

In 1925, Chadwick met Aileen Stewart-Brown, the daughter of a Liverpool stockbroker. The two were married in August 1925, with Kapitza as best man. The couple had twin daughters, Joanna and Judith, who were born in February 1927.

In his research, Chadwick continued to probe the nucleus. In 1925, the concept of spin had allowed physicists to explain the Zeeman effect,

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