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Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Cosmic-Ray Indirect. CRI- hadronic interactions/EAS development
Underground flux of atmospheric muons and its variations with 25 years of data of the LVD experiment
C.F. Vigorito* on behalf of the LVD Collaboration, G. Bruno, W. Fulgione, P. Ghia, A. Molinario, M. Selvi, G. Trinchero
*corresponding author
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Pre-published on: 2017 August 16
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Abstract
The Large Volume Detector (LVD) is a 1 kton liquid scintillator detector located at Laboratori Nazionali del Gran Sasso, Italy, at the average depth of 3600 m w.e.The experiment has been continuously taking data since June 1992.
The muon dataset collected by LVD over 25 years (from 1992 to 2016) consists of $~5.5 \cdot 10^{7}$ events, being the largest ever provided by a single detector underground. The analysis of the global time series shows a modulation of muon flux underground with period of $T=(365.1\pm0.2)\,$days, an amplitude of 1.5 % and a maximum at the beginning of July. A clear correlation with atmospheric temperature variations is present, with a measured coefficient of ${\alpha_{T}= 0.93 \pm 0.02}$. This is in agreement with the expected value at LVD depth and with the value measured by other experiments in the same underground site.
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