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A high-energy gamma-photon may turn into...

A high-energy gamma-photon may turn into an electron-positron pair in the field of heavy nuclei. What is the minimum energy of the gamma-photon?

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From the law of conservation of energy we obtain for the gamma-photon `epsi_(gamma)ge2m_(0)c^(2)`, where `m_(0)` is the rest mass of an electron.
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