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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.30: Poster

Montag, 8. September 2025, 18:30–20:30, ZHG Foyer 1. OG

Entering the overcritical regime of nonlinear Breit-Wheeler pair production by superintense, tightly focused laser pulses colliding with bremsstrahlung γ-rays — •Ingo Elsner, Alina Golub, Selym Villalba-Chavez, and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf

Nonlinear Breit-Wheeler pair production in collisions of a tightly focused high-intensity laser pulse with GeV bremsstrahlung photons is theoretically studied in an overcritical field regime, where the quantum nonlinearity parameter substantially exceeds unity [1]. We investigate under which conditions the attenuation of the γ-beam due to the production process must be taken into account and how much the second generation of created pairs contributes to the total yield. In the considered interaction regime, it is shown that the relevant range of bremsstrahlung frequencies is generally very broad and that – for sufficiently large values of the quantum nonlinearity parameter – an optimum domain of frequencies far below the spectral end point emerges. We also demonstrate that it is beneficial for achieving optimum pair yields to increase the interaction volume by a wider laser focus at the expense of decreased field intensity.

[1] I. Elsner, A. Golub, S. Villalba-Chávez and C. Müller, Phys. Rev. D 111, 096012 (2025)

Keywords: Pair Production; Strong Laser Fields; Breit-Wheeler Process