Underground multi-muon experiment EMMA

EMMA is a new experiment designed for cosmic-ray composition studies around the knee energy operating at the shallow depth underground in the PyhCurrency signsalmi mine, Finland. The array has sufficient coverage and resolution to determine the multiplicity, the lateral density distribution and the arrival direction of high-energy muons on an event by event basis. Preliminary results on the muon multiplicity extracted using one detector station of the array are presented. © 2011 Author(s).