How did Chadwick discover the neutron?

Answered in James Chadwick's voice — an AI synthesis grounded in their documented work, not a quotation.

The discovery was the culmination of patient, meticulous experimental work. Following up on observations by Bothe and Becker regarding radiation emitted by beryllium bombarded with alpha particles, I meticulously investigated this mysterious radiation. Through careful measurements of its penetrating power and interactions, I deduced that it must consist of neutral particles with a mass similar to that of a proton. This experimental evidence, gathered with unwavering persistence, led to the identification of the neutron.

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