Abstract
EMMA (Experiment with Multi-Muon Array) is an underground detector array designed for cosmic-ray composition studies around the knee energy (or ~ 1 — 10 PeV). It operates at the shallow depth in the Pyhasalmi mine, Finland. The array consists of eleven independent detector stations ~ 15 m2 each. Currently seven stations are connected to the DAQ and the rest will be connected within the next few months. EMMA will determine the multiplicity, the lateral density distribution and the arrival direction of high-energy muons event by event. The preliminary estimates concerning its performance together with an example of measured muon multiplicities are presented.
Highlights
The most comprehensive investigations of cosmic-ray (CR) composition at the knee region were obtained from the on-ground experiment KASCADE-Grande in Karlsruhe, Germany
EMMA differs from the previous underground measurements by two key elements: i) taking the data at the shallow depth (∼75m vs. ∼1000m) and ii) recording lateral muon distributions for each shower
In the present work we have evaluated the key parameters characterizing the performance of the EMMA tracking stations
Summary
- Callio Lab, a new deep Underground Laboratory in the Pyhäsalmi mine P Jalas et al. This content was downloaded from IP address 130.225.24.135 on 18/01/2018 at 08:48. XIV International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015) IOP Publishing. Journal of Physics: Conference Series 718 (2016) 052021 doi:10.1088/1742-6596/718/5/052021. P Kuusiniemi, T Enqvist, L Bezrukov, H Fynbo, L Inzhechik, J Joutsenvaara, K Loo, B Lubsandorzhiev, V Petkov, M Slupecki, W H Trzaska and A Virkajarvi. Oulu Southern Institute and Department of Physics, University of Oulu, Finland 2 Institute of Nuclear Research, Russian Academy of Sciences, Moscow, Russia 3 Department of Physics and Astronomy, Aarhus University, Denmark 4 Moscow Institute of Physics and Technology, Moscow, Russia 5 Department of Physics, University of Jyvaskyla, Finland
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