Institut de recherche sur les lois fondamentales de l'Univers

Over the last years the Pyramid of the Sun, at Teotihuacan, Mexico, has been searched for possible hidden chambers by means of muon attenuation measurements inside the monument’s volume. The experimental method is based on the use of a muon tracker which is placed in a tunnel, running below the base and ending close to the symmetry axis of the pyramid. The accumulated experimental data, when compared to physics simulations using GEANT4, show identifiable known features of the external shape of the pyramid. The experimental setup as well as results of the relative density distribution inside the pyramid are presented.