= Gamma ray cross section
{wiki=Gamma_ray_cross_section}
The gamma-ray cross section is a measure of the probability of interaction between gamma-ray photons and matter, typically expressed in units such as barns (1 barn = \\(10^\{-24\}\\) cm²). In nuclear and particle physics, the cross section quantifies the likelihood that a specific type of interaction will occur when a particle (in this case, a gamma-ray photon) encounters a target, which could be a nucleus, an atom, or a material.
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