Underground multi-muon experiment EMMA
12 Apr 2011
1Oulu Southern Institute and Department of Physics, University of Oulu, Finland
2Institute of Nuclear Research, Russian Academy of Sciences, Moscow, Russia
3Department of Physics and Astronomy, University of Aarhus, Denmark
4Department of Physics, University of Jyväskylä, Finland
Received: 12 November 2010 – Revised: 10 January 2011 – Accepted: 10 January 2011 – Published: 12 April 2011Abstract. EMMA is a new experiment designed for cosmic-ray composition studies around the knee energy operating at the shallow depth underground in the Pyhäsalmi 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.