1. Searching for cavities in the Teotihuacan
Pyramid of the Sun
using cosmic muons
ICRC-2011, Beijing, China

2. Archeology, geometry & location
- Three man-made tunnels ( ): no internal structure.
- Radón (1997) measurements: no large cavities (?)
- Moon Pyramide (+2002 results): Internal structure and large tumb!

3. Geometry
External shape
Old digitalization
AutoCad digitalization

4. Internal density

5. GEANT-4 simulation
Hypothetical
chamber
Smith
Tunnel
SBD method

6. Detector design Components: - Scintillators - Multiwire PC’s
- WFD readout
- Telemetry

7. Detector

8. DAQ

9. Simulated 2D

10. Measured 2D

11. Substarction

12. Summary and outlook
- Alvarez-type experiment in Teotihuacan
- Detector installed and running (6 months)
1 M count report:
Data & simulations are similar
Difference shows artifacts, possibly related to geometry, location, and density uncertainties
Too early to reach conclusions
Plan to run, at least 12 more months

13. Participants Anthropology Institute Physics Institute Researchers
Rubén Alfaro M.
Ernesto Belmont M.
Varlen Grabski
Arnulfo Martínez D.
Arturo Menchaca R.
Matías Moreno Y.
Andrés Sandoval
Technician
Mario Rangel
Students
Temilotzin Ibarra
Vladimir Lemus
Azucena Cervantes
Juan Manuel López
Roberto Núñez C.
Rémy Reche
Esteban Rodríguez
Edgar Vázquez
Anthropology Institute
Researchers
Linda Manzanilla N.
Luis Barba P.
Economic support
DGAPA-UNAM
CONACYT