In pair production, the heaviest particles are formed in reactions that have the highesttemperatures.

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Pair production is the process in which a high-energy photon (e.g. gamma ray) interacts with a nucleus, producing an electron and a positron (antielectron). The energy of the photon must be sufficient to convert the energy of the photon into the mass of the two particles. Therefore, the higher the temperature or energy of the system, the higher energy photons will be present and heavier particles can be produced. Pair production is a process where a photon interacts with an atomic nucleus or an electron to produce a particle-antiparticle pair. The energy required for this process increases with the mass of the particles produced. Therefore, the highest temperatures are required to produce the heaviest particles.

In Pair Production, the Heaviest Particles Are Formed in Reactions