Physics, 14.02.2020 23:46, ashleybashaam6821

If the electron e − and the positron e + both have rest energy 0.51 MeV, nd the minimum energy a particle of light γ (a photon) can have in the reaction e + + e − = γ + γ. Why can't there be a reaction producing only one photon, e + + e − = γ? Assume the center-of-mass frame.

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If the electron e − and the positron e + both have rest energy 0.51 MeV, nd the minimum energy a par...