Ciro Santilli
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Uranium emits them, you can see their mass to charge ratio under magnetic field and so deduce that they are electrons.
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Caused by weak interaction TODO why/how.
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The emitted electron kinetic energy is random from zero to a maximum value. The rest goes into a neutrino. This is how the neutrino was first discovered/observed indirectly. This is well illustrated in a decay scheme such as Figure 55. "Cesium-137 decay scheme.".
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Ancestors

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