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What does "to be opaque to pair production" mean?
(I'm talking about fireball).
I know what a pair production is but I can't get the crucial point: does it mean the photons don't collide?
If it is so that means an opaque-to-p.p.- source have a greater luminosity (emits more photons) than a non opaque source ...
but it can't be because the optical depth is usually an increasing function of the photon energy, and therefore, a large optical depth would prevent the escape of high-energy photons from the source...
(I'm talking about fireball).
I know what a pair production is but I can't get the crucial point: does it mean the photons don't collide?
If it is so that means an opaque-to-p.p.- source have a greater luminosity (emits more photons) than a non opaque source ...
but it can't be because the optical depth is usually an increasing function of the photon energy, and therefore, a large optical depth would prevent the escape of high-energy photons from the source...
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