As shown in Section 3,5, a lead nucleus can ensure momentum conservation in electron-positron pair production without affecting the energy balance. But roughly what is the limit on the mass of such a “detached participant”? Assume again that it acquires all the momentum of the photon, whose wavelength is 1.21 X 10-12 m, but the energy it “steals” is less insignificant, 0.01% of the photon’s energy, What is the mass of this less-detached participant?
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