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Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth

Author(s): Bellini, G; Benziger, Jay B.; Bick, D; Bonfini, G; Bravo, D; et al

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Abstract: The solar neutrino experiment Borexino, which is located in the Gran Sasso underground laboratories, is in a unique position to study muon-induced backgrounds in an organic liquid scintillator. In this study, a large sample of cosmic muons is identified and tracked by a muon veto detector external to the liquid scintillator, and by the specific light patterns observed when muons cross the scintillator volume. The yield of muon-induced neutrons is found to be Y-n = (3.10 +/- 0.11) . 10(-4) n/(mu . (g/cm(2))). The distance profile between the parent muon track and the neutron capture point has the average value lambda = (81.5 +/- 2.7) cm. Additionally the yields of a number of cosmogenic radioisotopes are measured for N-12, B-12, He-8, C-9, Li-9, B-8, He-6, Li-8, Be-11, C-10 and C-11. All results are compared with Monte Carlo simulation predictions using the FLUKA and GEANT4 packages. General agreement between data and simulation is observed for the cosmogenic production yields with a few exceptions, the most prominent case being C-11 yield for which both codes return about 50% lower values. The predicted mu-n distance profile and the neutron multiplicity distribution are found to be overall consistent with data.
Publication Date: Aug-2013
Electronic Publication Date: 27-Aug-2013
Citation: Bellini, G, Benziger, J, Bick, D, Bonfini, G, Bravo, D, Avanzini, M Buizza, Caccianiga, B, Cadonati, L, Calaprice, F, Cavalcante, P, Chavarria, A, Chepurnov, A, D Angelo, D, Davini, S, Derbin, A, Empl, A, Etenko, A, Fomenko, K, Franco, D, Galbiati, C, Gazzana, S, Ghiano, C, Giammarchi, M, Goeger-Neff, M, Goretti, A, Grandi, L, Hagner, C, Hungerford, E, Ianni, Aldo, Ianni, Andrea, Kobychev, V, Korablev, D, Korga, G, Kryn, D, Laubenstein, M, Lewke, T, Litvinovich, E, Loer, B, Lombardi, P, Lombardi, F, Ludhova, L, Lukyanchenko, G, Machulin, I, Manecki, S, Maneschg, W, Manuzio, G, Meindl, Q, Meroni, E, Miramonti, L, Misiaszek, M, Moellenberg, R, Mosteiro, P, Muratova, V, Oberauer, L, Obolensky, M, Ortica, F, Otis, K, Pallavicini, M, Papp, L, Perasso, L, Perasso, S, Pocar, A, Ranucci, G, Razeto, A, Re, A, Romani, A, Rossi, N, Saldanha, R, Salvo, C, Schoenert, S, Simgen, H, Skorokhvatov, M, Smirnov, O, Sotnikov, A, Sukhotin, S, Suvorovt, Y, Tartaglia, R, Testera, G, Vignaud, D, Vogelaar, RB, von Feilitzsch, F, Winter, J, Wojcik, M, Wright, A, Wurm, M, Xu, J, Zaimidoroga, O, Zavatarelliq, S, Zuzel, G, Collaboration, Borexino. (2013). Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 10.1088/1475-7516/2013/08/049
DOI: doi:10.1088/1475-7516/2013/08/049
ISSN: 1475-7516
Type of Material: Journal Article
Version: Author's manuscript

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