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We report the first results of a search for real photon–photon scattering using X rays. A novel system is developed to split and collide X-ray pulses by applying interferometric techniques. A total of 6.5×105 pulses (each containing about 1011 photons) from an X-ray Free-Electron Laser are injected into the system. No scattered events are observed, and an upper limit of 1.7×10−24m2 (95% C.L.) is obtained on the photon–photon elastic scattering cross section at 6.5 keV.
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Inada et al. (2014) studied this question.
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