1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 Aarhus University3 University of Oulu4 Russian Academy of Sciences5 University of Jyväskylä6 University of Jyväskyla7 Department of Physics and Astronomy, Science and Technology, Aarhus University
EMMA (Experiment with MultiMuon Array) is a new approach to study the composition of cosmic rays at the knee region (1 – 10 PeV). The array will measure the multiplicity and lateral distribution of the high-energy muon component of an air shower and its arrival direction on an event-by-event basis. The array operates in the Pyhäsalmi Mine, Finland, at a depth of 75 metres (or 210 m.w.e) corresponding to the cut-off energy of approximately 50 GeV for vertical muons. The data recording with a partial array has started and preliminary results of the first test runs are presented.
Journal of Physics: Conference Series (online), 2013, Vol 409, Issue 1