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In a radioactive decay process, the negatively charged emitted $\beta$-particles are:
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the electrons produced as a result of the decay of neutrons inside the nucleus
In $\beta^{-}$-decay a neutron is transformed into a proton and an electron is emitted with the nucleus along with an antineutrino.
$n \rightarrow p+\bar{e}+\bar{v}$ where $\bar{v}=$ antinutrino
$n \rightarrow p+\bar{e}+\bar{v}$ where $\bar{v}=$ antinutrino
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