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Write the basic nuclear processes underl...

Write the basic nuclear processes underlying `beta^+` and `beta^-` decays.

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`underset"(proton)"(._1^1p) overset(beta^+)to underset"(neutron)"(._0^1n) + underset"(positron)"(._(+1)^(" "0)e) + underset"(neutrino)"(._0^0v)`
`underset"(neutron)"(._0^1n) overset(beta^-)to underset"(proton)"(._1^1p) + underset"(electron)"(._(-1)^(" "0)e)+ underset"(anti-neutrion)"(._0^0 barv)`
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