Browsing by Author "Lombardi, Francesco"

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    Constraining non-standard interactions of the neutrino with Borexino
    Agarwalla, S. K.; Lombardi, Francesco; Takeuchi, Tatsu (Springer, 2012-12-01)
    We use the Borexino 153.6 ton·year data to place constraints on non-standard neutrino-electron interactions, taking into account the uncertainties in the 7Be solar neutrino flux and the mixing angle θ 23, and backgrounds due to 85Kr and 210Bi β-decay. We find that the bounds are comparable to existing bounds from all other experiments. Further improvement can be expected in Phase II of Borexino due to the reduction in the 85Kr background.
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    Modulations of the cosmic muon signal in ten years of Borexino data
    Agostini, Matteo; Altenmueller, Konrad; Appel, S.; Atroshchenko, Victor; Bagdasarian, Zara; Basilico, D.; Bellini, G.; Benziger, Jay; Bick, D.; Bolognino, Irene; Bonfini, G.; Bravo, D.; Caccianiga, B.; Calaprice, F.; Caminata, A.; Caprioli, S.; Carlini, M.; Cavalcante, P.; Cavanna, F.; Chepurnov, A.; Choi, K.; Collica, L.; D'Angelo, D.; Davini, S.; Derbin, A. V.; Ding, X. F.; Di Ludovico, Antonio; Di Noto, Lea; Drachnev, I.; Fomenko, K.; Formozov, A.; Franco, D.; Gabriele, Federico; Galbiati, C.; Gschwender, M.; Ghiano, C.; Giammarchi, Marco; Goretti, A.; Gromov, M.; Guffanti, D.; Hagner, C.; Houdy, T.; Hungerford, Ed V.; Ianni, Aldo; Ianni, Andrea; Jany, A.; Jeschke, D.; Kobychev, V.; Korablev, D.; Korga, G.; Kudryavtsev, V. A.; Kumaran, S.; Lachenmaier, Tobias; Laubenstein, Matthias; Litvinovich, E.; Lombardi, Francesco; Lombardi, Paolo; Ludhova, L.; Lukyanchenko, G.; Lukyanchenko, L.; Machulin, I. N.; Manuzio, G.; Marcocci, S.; Maricic, Jelena; Martyn, J.; Meighen-Berger, S.; Meroni, E.; Meyer, M.; Miramonti, L.; Misiaszek, M.; Muratova, V. N.; Neumair, B.; Nieslony, M.; Oberauer, L.; Opitz, B.; Orekhov, V.; Ortica, F.; Pallavicini, M.; Papp, L.; Penek, Oe; Pietrofaccia, L.; Pilipenko, N.; Pocar, A.; Porcelli, A.; Raikov, G.; Ranucci, G.; Razeto, A.; Re, A.; Redchuk, M.; Romani, A.; Rossi, Nicola; Rottenanger, Sebastian; Schoenert, S.; Semenov, D. A.; Skorokhvatov, Mikhail D.; Smirnov, O. Y.; Sotnikov, A.; Stokes, Lee F. F.; Suvorov, Yura; Tartaglia, R.; Testera, G.; Thurn, J.; Toropova, M.; Unzhakov, E. V.; Vishneva, A.; Vogelaar, R. Bruce; von Feilitzsch, F.; Weinz, S.; Wojcik, M. M.; Wurm, M.; Yokley, Z. W.; Zaimidoroga, O.; Zavatarelli, S.; Zuber, Kai; Zuzel, G. (2019-02)
    We have measured the flux of cosmic muons in the Laboratori Nazionali del Gran Sasso at 3800 m.w.e. to be (3.432 +/- 0.003) center dot 10(-4) m(-2) s(-1) based on ten years of Borexino data acquired between May 2007 and May 2017. A seasonal modulation with a period of (366.3 +/- 0.6) d and a relative amplitude of (1.36 +/- 0.04)% is observed. The phase is measured to be (181.7 +/- 0.4) d, corresponding to a maximum at the 1 st of July. Using data inferred from global atmospheric models, we show the muon flux to be positively correlated with the atmospheric temperature and measure the e ff ective temperature coe ffi cient alpha(T) = 0.90 +/- 0.02. The origin of cosmic muons from pion and kaon decays in the atmosphere allows to interpret the e ff ective temperature coe ffi cient as an indirect measurement of the atmospheric kaon-topion production ratio r(K/pi) = 0.11(-0.07)(+0.11) for primary energies above 18TeV. We find evidence for a long-term modulation of the muon flux with a period of similar to 3000 d and a maximum in June 2012 that is not present in the atmospheric temperature data. A possible correlation between this modulation and the solar activity is investigated. The cosmogenic neutron production rate is found to show a seasonal modulation in phase with the cosmic muon flux but with an increased amplitude of (2.6 +/- 0.4)%.
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    Solar Neutrinos Spectroscopy with Borexino Phase-II
    Miramonti, Lino; Agostini, Matteo; Altenmueller, Konrad; Appel, Simon; Atroshchenko, Victor; Bagdasarian, Zara; Basilico, Davide; Bellini, Gianpaolo; Benziger, Jay; Bick, Daniel; Bolognino, Irene; Bonfini, Giuseppe; Bravo, David; Caccianiga, Barbara; Calaprice, Frank; Caminata, Alessio; Caprioli, Silvia; Carlini, Marco; Cavalcante, Paolo; Cavanna, Francesca; Chepurnov, Alexander; Choi, Koun; Collica, Laura; Davini, Stefano; Derbin, Alexander; Ding, XueFeng; Di Ludovico, Antonio; Di Noto, Lea; Drachnev, Ilia; Fomenko, Kirill; Formozov, Andrey; Franco, Davide; Gabriele, Federico; Galbiati, Cristiano; Gschwender, Michael; Ghiano, Chiara; Giammarchi, Marco; Goretti, Augusto; Gromov, Maxim; Guffanti, Daniele; Hagner, Caren; Houdy, Thibaut; Hungerford, Ed V.; Ianni, Aldo; Ianni, Andrea; Jany, Anna; Jeschke, Dominik; Kobychev, Vladislav; Korablev, Denis; Korga, Gyorgy; Lachenmaier, Tobias; Laubenstein, Matthias; Litvinovich, Evgeny; Lombardi, Francesco; Lombardi, Paolo; Ludhova, Livia; Lukyanchenko, Georgy; Lukyanchenko, Liudmila; Machulin, Igor; Manuzio, Giulio; Marcocci, Simone; Maricic, Jelena; Martyn, Johann; Meroni, Emanuela; Meyer, Mikko; Misiaszek, Marcin; Muratova, Valentina; Neumair, Birgit; Oberauer, Lothar; Opitz, Bjoern; Orekhov, Vsevolod; Ortica, Fausto; Pallavicini, Marco; Papp, Laszlo; Penek, Omer; Pietrofaccia, Lidio; Pilipenko, Nelly; Pocar, Andrea; Porcelli, Alessio; Raikov, Georgy; Ranucci, Gioacchino; Razeto, Alessandro; Re, Alessandra; Redchuk, Mariia; Romani, Aldo; Rossi, Nicola; Rottenanger, Sebastian; Schöenert, Stefan; Semenov, Dmitrii; Skorokhvatov, Mikhail D.; Smirnov, Oleg; Sotnikov, Albert; Stokes, Lee F. F.; Suvorov, Yura; Tartaglia, Roberto; Testera, Gemma; Thurn, Jan; Toropova, Maria; Unzhakov, Evgenii; Vishneva, Alina; Vogelaar, R. Bruce; von Feilitzsch, Franz; Weinz, Stefan; Wojcik, Marcin; Wurm, Michael; Yokley, Zachary; Zaimidoroga, Oleg; Zavatarelli, Sandra; Zuber, Kai; Zuzel, Grzegorz (MDPI, 2018-11-07)
    Solar neutrinos have played a central role in the discovery of the neutrino oscillation mechanism. They still are proving to be a unique tool to help investigate the fusion reactions that power stars and further probe basic neutrino properties. The Borexino neutrino observatory has been operationally acquiring data at Laboratori Nazionali del Gran Sasso in Italy since 2007. Its main goal is the real-time study of low energy neutrinos (solar or originated elsewhere, such as geo-neutrinos). The latest analysis of experimental data, taken during the so-called Borexino Phase-II (2011-present), will be showcased in this talk—yielding new high-precision, simultaneous wide band flux measurements of the four main solar neutrino components belonging to the “pp” fusion chain (pp, pep, 7 Be, 8 B), as well as upper limits on the remaining two solar neutrino fluxes (CNO and hep).