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Asked in CBSE AIPMT 2003 · Q-value, decay and conservation laws
Read the two balances off the equation.
Mass number: A on the left and A on the right, so no nucleons leave.
Atomic number: it rises from Z to Z+1, while an electron ⁰₋₁e and an antineutrino are emitted.
A neutron inside the nucleus has turned into a proton, creating the electron at that instant.
That is β-decay, specifically β⁻ decay.
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