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A possible setup for the experimental verification of linear Breit-Wheelerpair creation of electrons and positrons in photon-photon collisions is studiedtheoretically. It combines highly energetic bremsstrahlung photons, which areassumed to be generated by an incident beam of GeV electrons penetratingthrough a high-$Z$ target, with keV photons from an X-ray laser field, which isdescribed as a focused Gaussian pulse. We discuss the dependencies of the pairyields on the incident electron energy, target thickness, laser parameters, andcollision geometry. It is shown that, for suitable conditions which arenowadays in reach at X-ray laser facilities, the resulting number of createdparticles seems to be well accessible for enabling the first experimentalobservation of the linear Breit-Wheeler process $\gamma\gamma\to e^+e^-$.

Linear Breit-Wheeler pair production by high-energy bremsstrahlung photons colliding with an intense X-ray laser pulse