Ernest Rutherford's theory of the existence of the neutron was proved by James Chadwick (1 Jan 1932 Jahr – 31 Dez 1932 Jahr)

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James Chadwick was able to determine that the neutron did exist and that its mass was about 0.1 percent more than the proton's. He published his findings with characteristic modesty in a first paper entitled "Possible Existence of Neutron."

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