On the possibility of research the photon-photon interaction at the European X-ray Free Electron Laser – European XFEL

Abstract

Abstract The possibility of performing the experimental research in the field of fundamental physics based on the unique instrument – European X-ray Free Electron Laser (E-XFEL) is considered in this paper. The calculations of the reaction γ + γ → e+ + e− cross section for gamma quanta with E ∼ (1 − 100) GeV energy with X-ray photons are performed. The possibility of experimental registration of reaction γ + γ → e+ + e− product are reviewed. Also, the optical depth of the interaction between gamma-rays with the E-XFEL’s photon pulses is estimated. Astrophysical applications are discussed.