Sunday, 19 August 2018

pair production - Why during annihilation of an electron and positron 2 gamma rays are produced instead of 1?



$1 \gamma \rightarrow 1 e^- + 1 e^+$ (pair production)


Then why



$1 e^- + 1 e^+ \rightarrow 2 \gamma$ (annihilation of matter)


instead of


$1 e^- + 1 e^+ -> 1 \gamma$ ?




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