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Within the framework of physics beyond the standard model we study thepossibility that mesons produced in the atmosphere by the cosmic ray flux,decay to heavy Majorana neutrino and these mostly to photons in the low massregion. We study the photon flux produced by sterile Majorana neutrinos ($N$)decaying after passing through a massive and opaque object such as a mountain.In order to model the production of $N$'s in the atmosphere and their decay tophotons, we consider the interaction between the Majorana neutrinos and thestandard matter as modeled by an effective theory. We then calculate the heavyneutrino flux originated by the decay of mesons in the atmosphere. Thesurviving photon flux, originated by $N$ decays, is calculated using transportequations that include the effects of Majorana neutrino production and decay.

Photons coming from an opaque obstacle as a manifestation of heavy neutrino decays