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Flux Modulations seen by the Muon Veto of the GERDA Experiment


GERDA Collaboration; Agostini, M; Allardt, M; Bakalyarov, A M; et al; Baudis, L; Benato, G; Walter, M (2016). Flux Modulations seen by the Muon Veto of the GERDA Experiment. Astroparticle Physics, 84:29-35.

Abstract

The Gerda experiment at Lngs of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66 PMTs in the water tank surrounding the Gerda cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two causes have been identified: ( i ) secondary muons from the Cngs neutrino beam (2.2%) and ( ii ) a temperature modulation of the atmosphere (1.4%). A mean cosmic muon rate of Iμ0=(3.477±0.002stat±0.067sys)×10−4 /(s · m 2 ) was found in good agreement with other experiments at Lngs . Combining the present result with those from previous experiments at Lngs the effective temperature coefficient αT,Lngs is determined to 0.93 ± 0.03. A fit of the temperature coefficients measured at various underground sites yields a kaon to pion ratio r K / π of 0.10 ± 0.03.

Abstract

The Gerda experiment at Lngs of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66 PMTs in the water tank surrounding the Gerda cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two causes have been identified: ( i ) secondary muons from the Cngs neutrino beam (2.2%) and ( ii ) a temperature modulation of the atmosphere (1.4%). A mean cosmic muon rate of Iμ0=(3.477±0.002stat±0.067sys)×10−4 /(s · m 2 ) was found in good agreement with other experiments at Lngs . Combining the present result with those from previous experiments at Lngs the effective temperature coefficient αT,Lngs is determined to 0.93 ± 0.03. A fit of the temperature coefficients measured at various underground sites yields a kaon to pion ratio r K / π of 0.10 ± 0.03.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:28 Dec 2016 15:59
Last Modified:28 Dec 2016 16:00
Publisher:Elsevier
ISSN:0927-6505
Publisher DOI:https://doi.org/10.1016/j.astropartphys.2016.08.002
Other Identification Number:arXiv:1601.06007

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