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Nature 129, 312 (27 February 1932) | doi:10.1038/129312a0;

Possible Existence of a Neutron

J. CHADWICK

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I have made some experiments using the valve counter to examine the properties of this radiation excited in beryllium. The valve counter consists of a small ionisation chamber connected to an amplifier, and the sudden production of ions by the entry of a particle, such as a proton or a-particle, is recorded by the deflexion of an oscillograph.