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28. A y ray can produce an electron-positron pair in the neighborhood of an electron at rest as well as a nucleus. Show that

28. A y ray can produce an electron-positron pair in the neighborhood of an electron at rest as well as a nucleus. Show that in this case the threshold energy is 4moc2. (Hint: Do not ignore the recoil of the original electron, but assume that all three particles move off together.)

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