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The identification of very high energy photons is of great importance for theunderstanding of the origin of extreme energy cosmic rays (EECR). Several canbe the sources of high energy photons at Earth. A guaranteed component is theflux of high energy photons expected as a consequence of the interaction ofcosmic rays with the cosmic photon background. Another contribution may beexpected as by-product at the acceleration sites of protons and nuclei,although such flux should be strongly suppressed for distant sources. On theother hand, top-down scenarios involving the decay of super heavy relicparticles or topological defects, even if not currently favored, have as acharacteristic signature an increasingly dominant flux of photons at thehighest energies. In this work we study the statistical separation betweenhadron and photon showers at energies where both, LPM effect and magnetosphericinteractions are important for the development of the cascades. We consider adetector with the same orbital characteristics as JEM-EUSO, but disregardtrigger and reconstruction efficiencies, in order to define the maximum idealdiscrimination power attainable.

Hadron-gamma discrimination from an orbital UHECR observatory