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19 April 2024

» arxiv » 1202.6403

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Cosmic-muon flux and annual modulation in Borexino at 3800 m water-equivalent depth
G. Bellini ; J. Benziger ; D. Bick ; G. Bonfini ; D. Bravo ; M. Buizza Avanzini ; B. Caccianiga ; L. Cadonati ; F. Calaprice ; C. Carraro ; P. Cavalcante ; A. Chavarria ; A. Chepurnov ; D. D'Angelo ; S. Davini ; A. Derbin ; A. Etenko ; F. von Feilitzsch ; K. Fomenko ; D. Franco ; C. Galbiati ; S. Gazzana ; C. Ghiano ; M. Giammarchi ; M. Goeger-Neff ; A. Goretti ; L. Grandi ; E. Guardincerri ; C. Hagner ; S. Hardy ; Aldo Ianni ; Andrea Ianni ; D. Korablev ; G. Korga ; Y. Koshio ; D. Kryn ; M. Laubenstein ; T. Lewke ; E. Litvinovich ; B. Loer ; F. Lombardi ; P. Lombardi ; L. Ludhova ; I. Machulin ; S. Manecki ; W. Maneschg ; G. Manuzio ; Q. Meindl ; E. Meroni ; L. Miramonti ; M. Misiaszek ; D. Montanari ; P. Mosteiro ; V. Muratova ; L. Oberauer ; M. Obolensky ; F. Ortica ; K. Otis ; M. Pallavicini ; L. Papp ; L. Perasso ; S. Perasso ; A. Pocar ; R.S. Raghavan ; G. Ranucci ; A. Razeto ; A. Re ; A. Romani ; A. Sabelnikov ; R. Saldanha ; C. Salvo ; S. Schönert ; H. Simgen ; M. Skorokhvatov ; O. Smirnov ; A. Sotnikov ; S. Sukhotin ; Y. Suvorov ; R. Tartaglia ; G. Testera ; D. Vignaud ; R.B. Vogelaar ; J. Winter ; M. Wojcik ; A. Wright ; M. Wurm ; J. Xu ; O. Zaimidoroga ; S. Zavatarelli ; G. Zuzel ;
Date:	28 Feb 2012
Abstract:	We have measured the muon flux at the underground Gran Sasso National Laboratory (3800 m w.e.) to be (3.41 pm 0.01) imes 10-4m-2s-1 using four years of Borexino data. A modulation of this signal is observed with a period of (366pm3) days and a relative amplitude of (1.29 pm 0.07)%. The measured phase is (179 pm 6) days, corresponding to a maximum on the 28th of June. Using the most complete atmospheric data models available, muon rate fluctuations are shown to be positively correlated with atmospheric temperature, with an effective coefficient {alpha}T = 0.93 pm 0.04. This result represents the most precise study of the muon flux modulation for this site and is in good agreement with expectations.
Source:	arXiv, 1202.6403
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