"The Aachen Muon Detector for the determination of the muon content in UHECRs "


Precise measurements of the muon content of extensive air showers are essential for the identification of the chemical composition of ultra-high-energy cosmic rays. Therefore, a new scintillator detector is proposed, the Aachen Muon Detector (AMD). It can complement existing ground arrays composed of, e.g., water-Cherenkov detector stations.
The detector consists of 64 scintillator tiles read out by semiconductor photo sensors, silicon photomultipliers (SiPM), which are located in a steel housing which could be placed beneath existing detector stations. SiPMs promise a photon detection efficiency which outperforms current photomultiplier tubes. In combination with their compact package, low cost per light sensor and a moderate bias voltage (< 100 volts) a modular and robust design can be achieved.
First characterisation measurements of the scintillator tiles have been performed. Also a detailed detector-response-simulation framework based on Geant4 has been developed to evaluate the baseline design of AMD and the to investigate the improvement obtained by AMD for the determination of the mass composition of cosmic rays or for other possible applications as large area muon detector, veto and counter.

Baseline Design of the Aachen Muon Detector

Current Construction Progress

AMD is currently in construction. First measurements of atmospheric muons have already been performed.

The AMD detector prototype.
Scintillator tile, WLS and optical fibres in a tray.


  • Ch. Peters, T. Bretz, T. Hebbeker, M. Lauscher, R. Meißner, L. Middendorf, T. Niggemann, J. Schumacher, "The muon detector prototype AMD for the
    determination of the muon content in UHECRs", ICRC (2015)


  • R. Meißner, "Characterisation studies", will be soon published


For any further information please contact: Peters, Christine, M.Sc.