²²⁷₉₀ Th is the daughter nucleus (nuclide) produced when ac227 undergoes beta decay by emitting an electron.
A fast energetic electron or positron called a beta particle is released from an atomic nucleus during beta decay, which changes the original nuclide into an isobar of that nuclide. When a nucleus has too many protons or neutrons, beta decay happens when one of the protons or neutrons is converted into the other. A neutron decays into a proton, an electron, and an antineutrino in beta minus decay: n p + e - +.
During beta decay, an unstable nucleus undergoes the conversion of a neutron into a proton, so
¹₀ n ----> ₁¹p + ₋₁⁰e ( Z + 1 )
The complete reaction is as follows:
²²⁷₈₉AC -----> ²²⁷₉₀ Th + ₋₁⁰e
Therefore, the daughter nucleus is ²²⁷₉₀ Th.
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