(n)the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus, Syn.pair creation, pair formation
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
(Physics) The simultaneous creation of a particle and its antiparticle, such as an electron and positron, from a photon; -- usually due to its interaction with the strong field near a nucleus. [ PJC ]