In the year 1914 a young (at that time) British physicist, James Chadwick, who was sent to Germany to study the phenomena of radioactive decay, came across a rather interesting but, as it looked then, not very important discovery. He found that electrons emitted by radioactive substances in the process called beta transformation do not all possess the same velocity. In fact their velocities vary over a rather wide range.
The reality of neutrinos
George Gamow; The reality of neutrinos. Physics Today 1 July 1948; 1 (3): 4–31. https://doi.org/10.1063/1.3066092
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