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: '''Pair Production''' occurs most often when a very high [[energy]] [[Gamma-ray|gamma ray]] passes close to a [[nucleus]]. However it can happen at any time in free space.
: During '''Pair Production''' the total [[energy]] of the [[photon]] is converted into the [[Rest Mass|rest mass]] of the [[particle]] pair.
: In '''Pair Production''' [[Conservation of Momentum|conservation of momentum]] is conserved due to the [[momentum]] of the two [[particlesparticle]] s after the their production.
===Equation===