학술논문
Flux modulations seen by the muon veto of the GERDA experiment
Document Type
article
Author
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
Source
Subject
Language
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.