. "113531435"^^ . . "13531435-n"^^ . . "0"^^ . . "pair formation"@en-us . . . "109680527"@en-us . . "the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus"@en-us . . "0"^^ . "112767138"@en-us . . "pair creation"@en-us . "pair production"^^ . . . "pair production"@en-us . .