Muon multiplicities measured using an underground cosmic-ray array

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Kuusiniemi, P.^1 ; Enqvist, T.^1 ; Bezrukov, L.^2 ; Fynbo, H.^3 ; Inzhechik, L.^4 ; Joutsenvaara, J.^1 ; Loo, K.^5 ; Lubsandorzhiev, B.^2 ; Petkov, V.^2 ; Slupecki, M.^5 ; Trzaska, W.H.^5 ; Virkajärvi, A.^1

Oulu Southern Institute, Department of Physics, University of Oulu, Finland^1

Institute of Nuclear Research, Russian Academy of Sciences, Moscow, Russia^2

Department of Physics and Astronomy, Aarhus University, Denmark^3

Moscow Institute of Physics and Technology, Moscow, Russia^4

Department of Physics, University of Jyväskylä, Finland^5

关键词: Arrival direction;    Cosmic ray composition;    Density distributions;    Detector stations;    High energy muon;    Knee energy;    Shallow depths;    Underground detectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/5/052021/pdf
DOI  :  10.1088/1742-6596/718/5/052021

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

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 Pyhäsalmi mine, Finland. The array consists of eleven independent detector stations ∼ 15 m2each. 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.