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Can you create antimatter by letting photons collide?

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Yes.

Photon-photon pair production can be represented by the equation $\gamma + \gamma^{'}\rightarrow e^-+e^+$, which basically means that the collision of two photons produces an electron and a positron (the anti-electron).

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  • $\begingroup$ In the case, two photons get converted into a pair of particles, would this this be in any case a particle and its antiparticle? Could be produced two neutrons? $\endgroup$ Jul 27, 2017 at 4:08
  • $\begingroup$ @HolgerFiedler I'd suggest you'd read about pair production, especially gamma-gamma pair production - that'll help answer your questions =) $\endgroup$ Jul 27, 2017 at 15:04

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