Photon into matter - antimatter pair production question.

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SUMMARY

The discussion centers on the phenomenon of "pair production," where a photon transforms into an antimatter/matter pair, typically involving an electron and a positron. This process requires the photon to interact with a nucleus and necessitates that the photon energy exceeds 1.022 MeV, which is twice the rest mass of the electron. When the antimatter and matter recombine, they produce two photons to conserve energy and momentum, rather than one.

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  • Understanding of quantum mechanics principles
  • Familiarity with photon energy calculations
  • Knowledge of particle physics, specifically electron and positron properties
  • Basic concepts of conservation of energy and momentum
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  • Research "pair production" in quantum electrodynamics
  • Study photon interactions with atomic nuclei
  • Explore the implications of energy conservation in particle physics
  • Learn about the properties and behavior of antimatter
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esmeralda4
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Hi there.

Just a few quick questions:

What causes a photon to become an antimatter / matter pair? Is it just random? Can a photon be influenced to encourage it to change? Also what is the process called? Do we say the photon has decayed? That doesn't seem right to me.

In addition, if the antimatter/matter pair then come back together again do they produce one photon or two?

Many thanks
 
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esmeralda4 said:
Hi there.

Just a few quick questions:

What causes a photon to become an antimatter / matter pair? Is it just random? Can a photon be influenced to encourage it to change? Also what is the process called? Do we say the photon has decayed? That doesn't seem right to me.

It's called "pair production". A free photon can't produce a pair and conserve energy and momentum, so it has to interact with something (usually a nucleus) in order for this to happen. In addition, the photon energy has to be greater than twice the rest mass of the particle. For example, to produce an electron/positron pair, the photon energy needs to be greater than 2x(511 KeV) = 1.022 MeV.

esmeralda4 said:
In addition, if the antimatter/matter pair then come back together again do they produce one photon or two?

It produces two photons. Again, producing one photon can't conserve energy and momentum.
 

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