APFIVE Conservation Laws in Electron Capture
During electron capture, a proton-rich nucleus captures an inner orbital electron. If the process is represented as p + e⁻ → n + X, what is X and why must it be emitted?
A
Gamma ray (γ); to conserve momentum
B
No particle needed; the reaction is already balanced
C
Electron neutrino (ν); to conserve lepton number
D
Electron antineutrino (ν̄); to conserve energy
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