Pair Production :
Pair production is the formation or materialization of two electrons, one negative and the other positive (positron), from a pulse of electromagnetic energy traveling through matter, usually in the vicinity of an atomic nucleus.
Definition: pair production: The physical process whereby a gamma-ray photon, usually through an interaction with the electromagnetic field of a nucleus, produces an electron and an anti-electron (positron).
Pair production
(a) The production of an electron and its antiparticle (a positron) from a photon (according to the equation E = mc2) The process can occur in the field of an atomic nucleus.
pair production The process in which two photons of electromagnetic radiation give rise to a particle—anti-particle pair.
partial eclipse Celestial event during which only a part of the occulted body is blocked from view.
PAIR PRODUCTION - Creation of a particle and its antiparticle from some form of energy, such as photons.
Pair Production - A process in which gamma rays are transformed into a particle and its antiparticle (such as an electron and a positron) ...
Pair Production: By interaction via the Coulomb force, in the vicinity of the nucleus, the energy of the incident photon is spontaneously converted into the mass of an electron-positron pair.
pair production 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.
pair production An absorption process for X-ray and gamma ray 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.
On the other hand, pair production is balanced by the pair annihilation process: electron + positron two gamma-ray photons.
The star then becomes unstable to radial perturbations due to electron-positron pair production in its core, and may collapse directly into a black hole with no supernova.
Since gamma rays have such high energy, they can participate in pair production, where the gamma ray spontaneously produces a particle and its anti-particle, imparting them with all of its energy. These particles are usually electrons and positrons.
When they encounter Earth's atmosphere they collide with atmospheric molecules and decay via pair production into antiprotons and antineutrons.
It can be viewed as a type of virtual pair production in which one of the particles falls through the event horizon of the black hole and hence cannot escape to rejoin its partner. [D89]
Hawking's Theorem ...
 See also: Energy, Electron, Photon, Ray, Positron
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