Pair Production ·
γ + γ → e⁻ + e⁺
un
seel
.com · photon-photon collision · gamma-ray horizon · pair cascade
Threshold
E₁E₂ > 0.26 MeV²
τ
γγ
=1 at 1 TeV
z ≈ 0.15
State
—
High-energy γ-ray
Background photon (EBL)
Electron e⁻
Positron e⁺
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Un
seel
.com · Pair Production