What is emitted when protons become neutrons

A proton is changed over into a neutron by the emanation of a positron with a neutrino.

In atomic material science, beta decomposition (β-rot) is a sort of radioactive rot wherein a beta molecule (quick lively electron or positron) is transmitted from a nuclear core, changing the first nuclide to its isobar.

For instance, beta rot of a neutron changes it into a proton by the discharge of an electron joined by an antineutrino; or, then again a proton is changed over into a neutron by the emanation of a positron with a neutrino in supposed positron outflow.  

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