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Pair Production and Annihilation

Description
Pair Production and Annihilation
(a) A particle and an antiparticle can be created when a high-energy photon
collides with a nucleus. (b) Conversely, a particle and an antiparticle can
annihilate each other and emit energy in the form of gamma rays. (The
processes are more complex and are only summarized in these drawings.)
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