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Flux modulations seen by the muon veto of the GERDA experiment

  • Author(s): 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;
  • 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;
  • 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;
  • Cattadori, C;
  • Pullia, A;
  • Riboldi, S;
  • Barabanov, I;
  • Belogurov, S;
  • Bezrukov, L;
  • Doroshkevich, E;
  • Fedorova, O;
  • Gurentsov, V;
  • Inzhechik, LV;
  • Kazalov, V;
  • Kornoukhov, VN;
  • Kuzminov, VV;
  • Lubsandorzhiev, B;
  • Moseev, P;
  • Selivanenko, O;
  • Veresnikova, A;
  • Yanovich, E;
  • Chernogorov, A;
  • Demidova, EV;
  • Kirpichnikov, IV;
  • Vasenko, AA;
  • Bakalyarov, AM;
  • Belyaev, ST;
  • Lebedev, VI;
  • Zhukov, SV;
  • Becerici-Schmidt, N;
  • Caldwell, A;
  • Liao, HY;
  • Majorovits, B;
  • Palioselitis, D;
  • Schulz, O;
  • Vanhoefer, L;
  • Bode, T;
  • Janicsk'o Cs'athy, J;
  • Lazzaro, A;
  • Schönert, S;
  • Wiesinger, C;
  • Bettini, A;
  • Brugnera, R;
  • Garfagnini, A;
  • Hemmer, S;
  • Medinaceli, E
  • 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 Iμ0=(3.477±0.002stat±0.067sys)×10−4/(s · m2) 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 rK/π of 0.10 ± 0.03.

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