Flux modulations seen by the muon veto of the Gerda experiment

Collaboration, Gerda; Agostini, M.; Allardt, M.; Balata, M.; D'Andrea, V.; Bakalyarov, A. M.; Barabanov, I.; Barros, N.; Bellottj, E.; Baudis, L.; Bauer, C.; Becerici-Schmidt, N.; Bellotti, E.; Belogurov, S.; Belyaev, S. T.; Benato, G.; Bettini, A.; Bezrukov, L.; Bode, T.; Borowicz, Dariusz; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; D’Andrea, V.; Demidova, E. V.; di Vacri, A.; Domula, A. R.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Fedorova, O.; Freund, K.; Frodyma, Nikodem; Gangapshev, A.; Garfagnini, A.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hegai, A.; Heisel, M.; Hemmer, S.; Hofmann, W.; Hult, Mikael; Inzhechik, L. V.; Ioannucci, L.; Janicsko, J.; Janicsk'o Cs'athy, J.; Junker, M.; Janicsk’o Cs’athy, J.; Jochum, J.; Kazalov, V.; Kihm, T.; Kirpichnikov, I. V.; Kirsch, A.; Klimenko, A.; Knapp, M.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lebedev, V. I.; Lehnert, B.; Liao, H. Y.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Lubsandorzhiev, B.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Misiaszek, Marcin; Knoepfle, K. T.; Medinaceli, E.; Moseev, P.; Nemchenok, I.; Palioselitis, D.; Panas, Krzysztof; Pandola, L.; Pelczar, Krzysztof; Pullia, A.; Riboldi, S.; Ritter, F.; Rumyantseva, N.; Sada, C.; Salathe, M.; Schmitt, C.; Schneider, B.; Schönert, S.; Schreiner, J.; Schütz, A.-K.; Schulz, O.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Simgen, H.; Lubashevsky, A.; Smolnikov, A.; Stanco, L.; Stepaniuk, M.; Strecker, H.; Vanhoefer, L.; Vasenko, A. A.; von Sturm, K.; Veresnikova, A.; Wagner, V.; Wegmann, A.; Wester, T.; Walter, M.; Wilsenach, H.; Wiesinger, C.; Wójcik, Marcin; Yanovich, E.; Zhitnikov, I.; Zinatulina, D.; Zhukov, S. V.; Zuber, K.; Guillaume, Lutter; Zuzel, Grzegorz; Schoenert, S.

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Elsevier, Astroparticle Physics, (84), p. 29-35

DOI: 10.1016/j.astropartphys.2016.08.002

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Flux modulations seen by the muon veto of the Gerda experiment

Journal article published in 2016 by Gerda Collaboration, M. Agostini, M. Allardt, M. Balata, V. D'Andrea, A. M. Bakalyarov, I. Barabanov, N. Barros, E. Bellottj, L. Baudis, C. Bauer, N. Becerici-Schmidt, E. Bellotti, S. Belogurov, S. T. Belyaev and other authors.

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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 ) sec- ondary 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 0 μ= (3 . 477 ±0 . 002 stat ±0 . 067 sys ) ×10 −4 /(s ·m 2 ) was found in good agreement with other experiments at Lngs . Combining the present result with those from previous ex- periments 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 / πof 0.10 ±0.03. ; JRC.G.2-Standards for Nuclear Safety, Security and Safeguard

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Flux modulations seen by the muon veto of the Gerda experiment

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