Question: Consider a collision between a cosmic ray proton and a photon in the cosmic microwave background whose energy corresponds to the ambient temperature of 2.7

Consider a collision between a cosmic ray proton and a photon in the cosmic microwave background whose energy corresponds to the ambient temperature of 2.7 K. Estimate the minimum proton energy required to produce

(a) An e⁺e⁻ pair,

(b) A proton–anti proton pair.

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The energy of the photon is k 32k B T where k B is Boltzmanns constant k B 8617 10 11 MeVK 1 giving ... View full answer

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