Pauli's Exclusion Principle
In Our Time: Science
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The Exclusion Rule and the Neutrino
Niels Bohr thought energy conservation, which was a really sacred principle, might even be wrong. He wrote to a conference of physicists suggesting that in addition to the electron charging out of the nucleus, there was a particle that we don't see. This particle he deduced very cleverly from looking at the data would have no electrical charge. It would have the same spin as the electron and very, very little mass. Now, he suggested this particle was later called the neutrino. And what he, in fact, was suggesting that instead of there being two particles coming out, there would be three, one of which was a mystery, so to speak.
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