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.
The conversion of a photon ( gamma ray), which has more than twice the rest mass energy of an electron (about 0.51 MeV per electron), into an electron and a positron when the incident photon passes through the strong electric field surrounding an atomic nucleus and vanishes. This is an example of creation of matter (the electron pair, one negative and one positive) from energy (the photon) according to Einstein's law: E = mc. Relatively unimportant in density logging because of the high threshold energy (greater than 1.02 MeV) required for the incident gamma ray. Important in the detection of gamma rays in the ionization chamber and Geiger-Mueller counter. One of the three interactions of gamma rays with matter. Compare photoelectric effect and Compton scattering.
An absorption process for X and gamma radiation in which the incident photon is annihilated in the vicinity of the nucleus of the absorbing atom, with subsequent production of an electron and positron pair. (Basic Science/Radiography/ionization/pairproduction_popup.htm)(Course Material/Radiography/Physics/radmatinteraction.htm)
Creation of an electron- positron pair by gamma ray interaction in the field of a nucleus. For this process to be possible, the gamma ray's energy must exceed 1.022 MeV, twice the rest mass of an electron.
The process in which two photons of electromagnetic radiation give rise to a particle—anti-particle pair.
The inverse process to pair annihilation where a particle-antiparticle pair are created from a pair of photon s. This often happens when a gamma-ray passes close to an atomic nucleus.
the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus
A collision process for gamma rays with energies greater than 1022-keV (two electron masses) where an electron /positron pair is produced. A heavy nucleus must be present for pair production. For high-energy gamma rays the pair production process is proportional to Z2 and ln(gamma).
an absorption process for x and gamma radiation where the incident photon is annihilated in the vicinity of the nucleus of the absorbing atom, producing an ion pair (beta and positron). This process only occurs for incident photon energies exceeding 1.02 MeV.
Process in which a very high-energy photon interacts with another photon or a strong magnetic field to give rise to a particle-anti-particle pair.
the production of an electron/positron pair by the interaction of a photon (with energy greater than 30 MeV) with matter, another photon or magnetic field
Pair production refers to the creation of an elementary particle and its antiparticle, usually from a photon (or another neutral boson). This is allowed, provided there is enough energy available 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 (though not necessarily on shell). All other conserved quantum numbers (angular momentum, electric charge) of the produced particles must sum to zero — thus the created particles shall have opposite values of each (for instance, if one particle has strangeness +1 then another one must have strangeness −1).
