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Flux modulations seen by the muon veto of the GERDA experiment

  • Author(s): collaboration, G
  • Agostini, M
  • Balata, M
  • D'Andrea, V
  • di Vacri, A
  • Ioannucci, L
  • Junker, M
  • Laubenstein, M
  • Macolino, C
  • Pandola, L
  • Borowicz, D
  • Frodyma, N
  • Misiaszek, M
  • Panas, K
  • Pelczar, K
  • Wojcik, M
  • Zuzel, G
  • Allardt, M
  • Barros, N
  • Domula, A
  • Lehnert, B
  • Schneider, B
  • Wester, T
  • Wilsenach, H
  • Zuber, K
  • Borowicz, D
  • Brudanin, V
  • Egorov, V
  • Gusev, K
  • Klimenko, A
  • Kochetov, O
  • Lubashevskiy, A
  • Nemchenok, I
  • Rumyantseva, N
  • Shevchik, E
  • Shirchenko, M
  • Zhitnikov, I
  • Zinatulina, D
  • Hult, M
  • Lutter, G
  • Bauer, C
  • Gangapshev, A
  • Heisel, M
  • Hofmann, W
  • Kihm, T
  • Kirsch, A
  • Klimenko, A
  • Knöpfle, KT
  • Lindner, M
  • Maneschg, W
  • Salathe, M
  • Schreiner, J
  • Schwingenheuer, B
  • Simgen, H
  • Smolnikov, A
  • Stepaniuk, M
  • Strecker, H
  • Wagner, V
  • Wegmann, A
  • Bellotti, E
  • Bellotti, E
  • Cattadori, C
  • Pullia, A
  • Riboldi, S
  • Barabanov, I
  • Belogurov, S
  • Bezrukov, L
  • Doroshkevich, E
  • Fedorova, O
  • Gangapshev, A
  • Gurentsov, V
  • Inzhechik, LV
  • Kazalov, V
  • Kornoukhov, VN
  • Kuzminov, VV
  • Lubsandorzhiev, B
  • Moseev, P
  • Selivanenko, O
  • Veresnikova, A
  • Yanovich, E
  • Belogurov, S
  • Chernogorov, A
  • Demidova, EV
  • Kirpichnikov, IV
  • Kornoukhov, VN
  • Vasenko, AA
  • Bakalyarov, AM
  • Belyaev, ST
  • Gusev, K
  • Lebedev, VI
  • Shirchenko, M
  • Zhukov, SV
  • Becerici-Schmidt, N
  • Caldwell, A
  • Liao, HY
  • Majorovits, B
  • Palioselitis, D
  • Schulz, O
  • Vanhoefer, L
  • et al.
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 I =(3.477±0.002 ±0.067 )×10 /(s · m ) 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 α 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 of 0.10 ± 0.03. μ stat sys T,Lngs K/π 0 −4 2

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