What is pair production and pair …

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Pair production is the creation of an elementary particle and its antiparticle, for example creating an electron and positron, a muon and antimuon, or a proton and antiproton. Pair production often refers specifically to a photon creating an electron-positron pair near a nucleus but can more generally refer to any neutral boson creating a particle-antiparticle pair. In order for pair production to occur, the incoming energy of the interaction must be above a threshold in order to create the pair, at least the total rest mass energy of the two particles and that the situation allows, both energy and momentum to be conserved.There exists an inverse process to pair production called pair annihilation, in which a particle and its antiparticle collide and annihilate each other, the total energy of the two particles appearing as electromagnetic radiation.

The conversion of a photon into an electron-positron pair on its interaction with the strong electric field surrounding a nucleus is called pair production.
The converse of pair production in which an electron and positron combine to produce two photons is known as annihilation of matter.