Collisions of bremsstrahlung γ-rays with 10^23 W/cm^2 laser pulses could yield up to a few pairs per shot in the overcritical regime, with optimal yield at moderate focusing.
The relevance of and scaling with the interaction time 7 5 10 15 20 25 30 35 40 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 10-7 FIG
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Entering the overcritical regime of nonlinear Breit-Wheeler pair production in collisions of bremsstrahlung $\gamma$-rays and superintense, tightly focused laser pulses
Collisions of bremsstrahlung γ-rays with 10^23 W/cm^2 laser pulses could yield up to a few pairs per shot in the overcritical regime, with optimal yield at moderate focusing.