1. the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus; [syn: pair production, pair creation, pair formation]
WordNet (r) 3.0 (2006):
pair creation
n 1: the transformation of a gamma-ray photon into an electron
and a positron when the photon passes close to an atomic
nucleus [syn: pair production, pair creation, pair
formation]