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1. Borexino’s search for low-energy neutrinos associated with gravitational wave events from GWTC-3 database

Author: D. Basilico, G. Bellini, J. Benziger, R. Biondi, B. Caccianiga, F. Calaprice, A. Caminata, A. Chepurnov, D. D’Angelo, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, Aldo Ianni, Andrea Ianni, A. Jany, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, I. Machulin, J. Martyn, E. Meroni, L. Miramonti, M. Misiaszek, V. Muratova, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Pelicci, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M. T. Ranalli, G. Ranucci, A. Re, N. Rossi, S. Schönert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, R. Tartaglia, G. Testera, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, S. Zavatarelli, K. Zuber, and G. Zuzel
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract The search for neutrino events in correlation with gravitational wave (GW) events for three observing runs (O1, O2 and O3) from 09/2015 to 03/2020 has been performed using the Borexino data-set of the same period. We have searched for signals of neutrino-electron scattering and inverse beta-decay (IBD) within a time window of $$\pm \, 1000$$ ± 1000 s centered at the detection moment of a particular GW event. The search was done with three visible energy thresholds of 0.25, 0.8 and 3.0 MeV. Two types of incoming neutrino spectra were considered: the mono-energetic line and the supernova-like spectrum. GW candidates originated by merging binaries of black holes (BHBH), neutron stars (NSNS) and neutron star and black hole (NSBH) were analyzed separately. Additionally, the subset of most intensive BHBH mergers at closer distances and with larger radiative mass than the rest was considered. In total, follow-ups of 74 out of 93 gravitational waves reported in the GWTC-3 catalog were analyzed and no statistically significant excess over the background was observed. As a result, the strongest upper limits on GW-associated neutrino and antineutrino fluences for all flavors ( $$\nu _e, \nu _\mu , \nu _\tau $$ ν e , ν μ , ν τ ) at the level $$10^9{-}10^{15}~\textrm{cm}^{-2}\,\textrm{GW}^{-1}$$ 10 9 - 10 15 cm - 2 GW - 1 have been obtained in the 0.5–5 MeV neutrino energy range.
Published: 2023
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2. Search for low-energy signals from fast radio bursts with the Borexino detector

Author: S. Appel, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, R. Biondi, B. Caccianiga, F. Calaprice, A. Caminata, A. Chepurnov, D. D’Angelo, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, A. S. Göttel, M. Gromov, D. Guffanti, Aldo Ianni, Andrea Ianni, A. Jany, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, I. Machulin, J. Martyn, E. Meroni, L. Miramonti, M. Misiaszek, V. Muratova, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Pelicci, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M. T. Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, N. Rossi, S. Schönert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, R. Tartaglia, G. Testera, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, S. Zavatarelli, I. Zhutikov, K. Zuber, G. Zuzel, and Borexino Collaboration
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract The search for neutrino events in correlation with 42 most intense fast radio bursts (FRBs) has been performed using the Borexino dataset from 05/2007 to 06/2021. We have searched for signals with visible energies above 250 keV within a time window of $$\pm \, 1000$$ ± 1000 s corresponding to detection time of a particular FRB. We also applied an alternative approach based on searching for specific shapes of neutrino-electron scattering spectra in the full exposure data of the Borexino detector. In particular, two incoming neutrino spectra were considered: the monoenergetic line and the spectrum expected from supernovae. The same spectra were considered for electron antineutrinos detected through inverse beta-decay reaction. No statistically significant excess over the background was observed. As a result, the strongest upper limits on FRB-associated neutrino fluences of all flavors have been obtained in the 0.5–50 MeV neutrino energy range.
Published: 2022
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3. Identification of the cosmogenic $$^{11}$$ 11 C background in large volumes of liquid scintillators with Borexino

Author: M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, R. Biondi, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, P. Cavalcante, A. Chepurnov, D. D’Angelo, S. Davini, A. Derbin, A. Di ZGiacintio, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, A. Formozov, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, A. S. Göttel, M. Gromov, D. Guffanti, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, L. Pelicci, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, A. Porcelli, G. Raikov, M. T. Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Schönert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, Y. Suvorov, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, S. Zavatarelli, K. Zuber, and G. Zuzel
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Cosmogenic radio-nuclei are an important source of background for low-energy neutrino experiments. In Borexino, cosmogenic $$^{11}$$ 11 C decays outnumber solar pep and CNO neutrino events by about ten to one. In order to extract the flux of these two neutrino species, a highly efficient identification of this background is mandatory. We present here the details of the most consolidated strategy, used throughout Borexino solar neutrino measurements. It hinges upon finding the space-time correlations between $$^{11}$$ 11 C decays, the preceding parent muons and the accompanying neutrons. This article describes the working principles and evaluates the performance of this Three-Fold Coincidence (TFC) technique in its two current implementations: a hard-cut and a likelihood-based approach. Both show stable performances throughout Borexino Phases II (2012–2016) and III (2016–2020) data sets, with a $$^{11}$$ 11 C tagging efficiency of $$\sim 90$$ ∼ 90 % and $$\sim $$ ∼ 63–66 % of the exposure surviving the tagging. We present also a novel technique that targets specifically $$^{11}$$ 11 C produced in high-multiplicity during major spallation events. Such $$^{11}$$ 11 C appear as a burst of events, whose space-time correlation can be exploited. Burst identification can be combined with the TFC to obtain about the same tagging efficiency of $$\sim 90\%$$ ∼ 90 % but with a higher fraction of the exposure surviving, in the range of $$\sim $$ ∼ 66–68 %.
Published: 2021
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4. Characterization of SABRE crystal NaI-33 with direct underground counting

Author: M. Antonello, I. J. Arnquist, E. Barberio, T. Baroncelli, J. Benziger, L. J. Bignell, I. Bolognino, F. Calaprice, S. Copello, I. Dafinei, D. D’Angelo, G. D’Imperio, M. D’Incecco, G. Di Carlo, M. Diemoz, A. Di Giacinto, A. Di Ludovico, W. Dix, A. R. Duffy, E. Hoppe, A. Ianni, M. Iannone, L. Ioannucci, S. Krishnan, G. J. Lane, I. Mahmood, A. Mariani, S. Milana, J. Mould, F. Nuti, D. Orlandi, V. Pettinacci, L. Pietrofaccia, S. Rahatlou, F. Scutti, M. Souza, A. E. Stuchbery, B. Suerfu, C. Tomei, P. Urquijo, C. Vignoli, A. Wallner, M. Wada, A. G. Williams, A. Zani, and M. Zurowski
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Ultra-pure NaI(Tl) crystals are the key element for a model-independent verification of the long standing DAMA result and a powerful means to search for the annual modulation signature of dark matter interactions. The SABRE collaboration has been developing cutting-edge techniques for the reduction of intrinsic backgrounds over several years. In this paper we report the first characterization of a 3.4 kg crystal, named NaI-33, performed in an underground passive shielding setup at LNGS. NaI-33 has a record low $$^{39}$$ 39 K contamination of 4.3 ± 0.2 ppb as determined by mass spectrometry. We measured a light yield of 11.1 ± 0.2 photoelectrons/keV and an energy resolution of 13.2% (FWHM/E) at 59.5 keV. We evaluated the activities of $$^{226}$$ 226 Ra and $$^{228}$$ 228 Th inside the crystal to be $$5.9\pm 0.6~\upmu $$ 5.9 ± 0.6 μ Bq/kg and $$1.6\pm 0.3~\upmu $$ 1.6 ± 0.3 μ Bq/kg, respectively, which would indicate a contamination from $$^{238}$$ 238 U and $$^{232}$$ 232 Th at part-per-trillion level. We measured an activity of 0.51 ± 0.02 mBq/kg due to $$^{210}$$ 210 Pb out of equilibrium and a $$\alpha $$ α quenching factor of 0.63 ± 0.01 at 5304 keV. We illustrate the analyses techniques developed to reject electronic noise in the lower part of the energy spectrum. A cut-based strategy and a multivariate approach indicated a rate, attributed to the intrinsic radioactivity of the crystal, of $$\sim $$ ∼ 1 count/day/kg/keV in the [5–20] keV region.
Published: 2021
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5. Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II

Author: The Borexino collaboration, S. K. Agarwalla, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, L. Cappelli, P. Cavalcante, F. Cavanna, A. Chepurnov, K. Choi, D. D’Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, K. Fomenko, A. Formozov, D. Franco, F. Gabriele, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, C. Hagner, E. Hungerford, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, S. Kumaran, V. Kobychev, G. Korga, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, G. Manuzio, S. Marcocci, J. Maricic, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, C. Sun, Y. Suvorov, T. Takeuchi, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, K. Zuber, and G. Zuzel
Subjects: Neutrino Physics, Beyond Standard Model, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract The Borexino detector measures solar neutrino fluxes via neutrino-electron elastic scattering. Observed spectra are determined by the solar-ν e survival probability P ee (E), and the chiral couplings of the neutrino and electron. Some theories of physics beyond the Standard Model postulate the existence of Non-Standard Interactions (NSI’s) which modify the chiral couplings and P ee (E). In this paper, we search for such NSI’s, in particular, flavor-diagonal neutral current interactions that modify the ν e e and ν τ e couplings using Borexino Phase II data. Standard Solar Model predictions of the solar neutrino fluxes for both high- and low-metallicity assumptions are considered. No indication of new physics is found at the level of sensitivity of the detector and constraints on the parameters of the NSI’s are placed. In addition, with the same dataset the value of sin2 θ W is obtained with a precision comparable to that achieved in reactor antineutrino experiments .
Published: 2020
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6. The SABRE project and the SABRE Proof-of-Principle

Author: M. Antonello, E. Barberio, T. Baroncelli, J. Benziger, L. J. Bignell, I. Bolognino, F. Calaprice, S. Copello, D. D’Angelo, G. D’Imperio, I. Dafinei, G. Di Carlo, M. Diemoz, A. Di Ludovico, W. Dix, A. R. Duffy, F. Froborg, G. K. Giovanetti, E. Hoppe, A. Ianni, L. Ioannucci, S. Krishnan, G. J. Lane, I. Mahmood, A. Mariani, M. Mastrodicasa, P. Montini, J. Mould, F. Nuti, D. Orlandi, M. Paris, V. Pettinacci, L. Pietrofaccia, D. Prokopovic, S. Rahatlou, N. Rossi, A. Sarbutt, E. Shields, M. J. Souza, A. E. Stuchbery, B. Suerfu, C. Tomei, V. Toso, P. Urquijo, C. Vignoli, M. Wada, A. Wallner, A. G. Williams, and J. Xu
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract SABRE aims to directly measure the annual modulation of the dark matter interaction rate with NaI(Tl) crystals. A modulation compatible with the standard hypothesis, in which our Galaxy is immersed in a dark matter halo, has been measured by the DAMA experiment in the same target material. Other direct detection experiments, using different target materials, seem to exclude the interpretation of such modulation in the simplest scenario of WIMP-nucleon elastic scattering. The SABRE experiment aims to carry out an independent search with sufficient sensitivity to confirm or refute the DAMA claim. The goal of the SABRE experiment is to achieve the lowest background rate for a NaI(Tl) experiment (order of 0.1 cpd/kg/keVee in the energy region of interest for dark matter). This challenging goal could be achievable by operating high-purity crystals inside a liquid scintillator veto for active background rejection. In addition, twin detectors will be located in the northern and southern hemispheres to identify possible contributions to the modulation from seasonal or site-related effects. The SABRE project includes an initial Proof-of-Principle phase at LNGS (Italy), to assess the radio-purity of the crystals and the efficiency of the liquid scintillator veto. This paper describes the general concept of SABRE and the expected sensitivity to WIMP annual modulation.
Published: 2019
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7. Solar neutrino physics with Borexino

Author: Andrea Pocar, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, L. Cappelli, S. Caprioli, M. Carlini, P. Cavalcante, F. Cavanna, A. Chepurnov, K. Choi, L. Collica, D. D’Angelo, S. Davini, A. Derbin, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, K. Fomenko, A. Formozov, D. Franco, F. Gabriele, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, T. Houdy, E. Hungerford, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, S. Kumaran, V. Kobychev, G. Korga, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, G. Manuzio, S. Marcocci, J. Maricic, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Porcelli, G. Raikov, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, L. F. F. Stokes, Y. Suvorov , R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, S. Weinz, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, K. Zuber, G. Zuzel
Subjects: Physics, QC1-999
Abstract: We present the most recent solar neutrino results from the Borexino experiment at the Gran Sasso underground laboratory. In particular, refined measurements of all neutrinos produced in the {\it pp} fusion chain have been made. It is the first time that the same detector measures the entire range of solar neutrinos at once. These new data weakly favor a high-metallicity Sun. Prospects for measuring CNO solar neutrinos are also discussed.
Published: 2019
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8. Solar and geoneutrinos

Author: L Ludhova, M Agostini, K Altenmüller, S Appel, V Atroshchenko, Z Bagdasarian, D Basilico, G Bellini, J Benziger, R Biondi, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D’Angelo, S Davini, A Derbin, A Di Giacinto, V Di Marcello, X.F Ding, A Di Ludovico, L Di Noto, I Drachnev, A Formozov, D Franco, C Galbiati, C Ghiano, M Giammarchi, A Goretti, A.S Göttel, M Gromov, D Guffanti, Aldo Ianni, Andrea Ianni, A Jany, D Jeschke, V Kobychev, G Korga, S Kumaran, M Laubenstein, E Litvinovich, P Lombardi, I Lomskaya, G Lukyanchenko, L Lukyanchenko, I Machulin, J Martyn, E Meroni, M Meyer, L Miramonti, M Misiaszek, V Muratova, B Neumair, M Nieslony, R Nugmanov, L Oberauer, V Orekhov, F Ortica, M Pallavicini, L Papp, L Pelicci, Ö Penek, L Pietrofaccia, N Pilipenko, A Pocar, G Raikov, M.T Ranalli, G Ranucci, A Razeto, A Re, M Redchuk, A Romani, N Rossi, S Schönert, D Semenov, G Settanta, M Skorokhvatov, A Singhal, O Smirnov, A Sotnikov, Y Suvorov, R Tartaglia, G Testera, J Thurn, E Unzhakov, F Villante, A Vishneva, R.B Vogelaar, F von Feilitzsch, M Wojcik, M Wurm, S Zavatarelli, K Zuber, G Zuzel, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), and Borexino
Subjects: History, neutrino: solar, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, ddc:530, High Energy Physics::Experiment, neutrino: geophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ddc, Physics::Geophysics, Computer Science Applications, Education
Abstract: Thanks to the progress of neutrino physics, today we are able of exploiting neutrinos as a tool to study astrophysical objects. The latter in turn serve as unique sources of elusive neutrinos, which fundamental properties are still to be understood. This contribution attempts to summarize the latest results obtained by measuring neutrinos emitted from the Sun and geoneutrinos produced in radioactive decays inside the Earth, with a particular focus on a recent discovery of the CNO-cycle solar neutrinos by Borexino. Comprehensive measurement of the pp-chain solar neutrinos and the first directional detection of sub-MeV solar neutrinos by Borexino, the updated 8B solar neutrino results of Super-Kamiokande, as well as the latest Borexino and KamLAND geoneutrino measurements are also discussed.
Published: 2021
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9. First Cherenkov directional detection of sub-MeV solar neutrinos in Borexino

Author: Johann Martyn, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, R. Biondi, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, P. Cavalcante, A. Chepurnov, D. D’Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X.F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, A. Formozov, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, A.S. Göttel, M. Gromov, D. Guffanti, null Aldo Ianni, null Andrea Ianni, A. Jany, D. Jeschke, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, L. Pelicci, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M.T. Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Schönert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, Y. Suvorov, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R.B. Vogelaar, F. von Feilitzsch, M. Wojcik, B. Wonsak, M. Wurm, S. Zavatarelli, K. Zuber, and G. Zuzel
Subjects: Computer Science::Machine Learning, History, Physics::Instrumentation and Detectors, Computer Science::Mathematical Software, Computer Science::Digital Libraries, Computer Science Applications, Education
Abstract: Borexino is a 280t liquid scintillator detector at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. Its main goal is the precision spectroscopy of solar neutrinos down to energies of 0.19 MeV and for this task it features an unprecedented radio-purity and a high scintillation light yield. The solar neutrinos are measured by the elastic scattering off electrons which induce isotropically emitted scintillation photons as well as a sub-dominant number of Cherenkov photons that are detected by photomulitplier tubes. Here we present the first detection of sub-MeV solar neutrinos using their associated Cherenkov photons in a high light yield liquid scintillator detector. In Borexino electrons with E>0.16MeV produce Cherenkov photons, where the ratio of Cherenkov photons from the neutrino scattered electrons is estimated to be < 1% for all PMT hits, so a typical event by event direction reconstruction is not possible. Instead this analysis looks at the integrated signal of the PMT hits of all detected events by correlating the position of each hit PMT relative to the reconstructed position of the event and the well known position of the Sun. In this way it is possible to measure an angular distribution that shows the statistical contribution of Cherenkov photons from the solar neutrino recoil electrons. Using the Geant4-based Borexino Monte Carlo to produce the expected angular distribution for solar neutrinos and background we have measured 8643 − 2058 +2252 neutrino events out of 19904 total events for an energy region around the 7Be edge between 0.53 MeV and 0.74 MeV.
Published: 2021
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10. Observation of CNO cycle solar neutrinos in Borexino

Author: Ö Penek, M Agostini, K Altenmüller, S Appel, V Atroshchenko, Z Bagdasarian, D Basilico, G Bellini, J Benziger, R Biondi, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D’Angelo, S Davini, A Derbin, A Di Giacinto, V Di Marcello, X.F Ding, A Di Ludovico, L Di Noto, I Drachnev, A Formozov, D Franco, C Galbiati, C Ghiano, M Giammarchi, A Goretti, A.S Göttel, M Gromov, D Guffanti, Aldo Ianni, Andrea Ianni, A Jany, D Jeschke, V Kobychev, G Korga, S Kumaran, M Laubenstein, E Litvinovich, P Lombardi, I Lomskaya, L Ludhova, G Lukyanchenko, L Lukyanchenko, I Machulin, J Martyn, E Meroni, M Meyer, L Miramonti, M Misiaszek, V Muratova, B Neumair, M Nieslony, R Nugmanov, L Oberauer, V Orekhov, F Ortica, M Pallavicini, L Papp, L Pelicci, L Pietrofaccia, N Pilipenko, A Pocar, G Raikov, M.T Ranalli, G Ranucci, A Razeto, A Re, M Redchuk, A Romani, N Rossi, S Schønert, D Semenov, G Settanta, M Skorokhvatov, A Singhal, O Smirnov, A Sotnikov, Y Suvorov, R Tartaglia, G Testera, J Thurn, E Unzhakov, F Villante, A Vishneva, R.B Vogelaar, F von Feilitzsch, M Wojcik, M Wurm, S Zavatarelli, K Zuber, and G Zuzel
Subjects: History, Physics::Instrumentation and Detectors, Astrophysics::Solar and Stellar Astrophysics, ddc:530, High Energy Physics::Experiment, Computer Science Applications, Education
Abstract: The Borexino detector, located at the Laboratori Nazionali del Gran Sasso in Italy, is a radiopure 280 ton liquid scintillator detector with a primary goal to measure low-energy solar neutrinos created in the core of the Sun. These neutrinos are a consequence of nuclear fusion reactions in the solar core where Hydrogen is burned into Helium and provide a direct probe of the energy production processes, namely the proton-proton (pp) chain and the Carbon-Nitrogen-Oxygen (CNO) cycle. The fusion of Hydrogen in the case of the CNO cycle, which is expected to contribute in the order of less than 1% to the total solar energy, is catalyzed by Carbon, Nitrogen, and Oxygen directly depending on the abundances of these elements in the solar core. The measurement of CNO neutrinos is challenging due to the high spectral correlation with the decay electrons of the background isotope 210Bi and the pep solar neutrino signal. The experimental achievement of thermal stabilization of the Borexino detector after mid 2016, has opened the possibility to develop a method to constrain the 210Bi rate through its decay daughter and α emitter 210Po which can be identified in Borexino with an efficiency close to 100 percent on an event-by-event basis. Moreover, the flux of pep neutrinos can be constrained precisely through a global analysis of solar neutrino data which is independent of the dataset used for the CNO analysis. This conference contribution is dedicated to the first experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun which is at the same time the dominant energy production mechanism in heavier stars compared to the Sun.
Published: 2021
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11. Characterization of SABRE crystal NaI-33 with direct underground counting

Author: Andrea Zani, S. Milana, A. Di Ludovico, C. Vignoli, Marcella Diemoz, Andrew Stuchbery, I. J. Arnquist, A. Di Giacinto, T. Baroncelli, Giulia D'imperio, F. Calaprice, Federico Scutti, D. D'Angelo, Jeremy Mould, M. Wada, G. Di Carlo, Anton Wallner, Elisabetta Luigia Barberio, Michael Souza, L. Pietrofaccia, Lindsey J. Bignell, Shahram Rahatlou, Gregory Lane, Anthony G. Williams, M. Zurowski, Andrea Mariani, D. Orlandi, S. Copello, M. Antonello, Eric W. Hoppe, Francesco Nuti, V. Pettinacci, I. Bolognino, I. Mahmood, Alan R. Duffy, Claudia Tomei, L. Ioannucci, P. Urquijo, M. Iannone, Ioan Dafinei, B. Suerfu, Aldo Ianni, S. Krishnan, W. Dix, J. Benziger, and M. D'Incecco
Subjects: Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Analytical chemistry, FOS: Physical sciences, lcsh:Astrophysics, 01 natural sciences, Atomic, Crystal, Particle and Plasma Physics, 0103 physical sciences, Energy spectrum, lcsh:QB460-466, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear, 010306 general physics, Engineering (miscellaneous), physics.ins-det, Physics, Quantum Physics, 010308 nuclear & particles physics, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Full width at half maximum, 13. Climate action, lcsh:QC770-798, Energy (signal processing)
Abstract: Ultra-pure NaI(Tl) crystals are the key element for a model-independent verification of the long standing DAMA result and a powerful means to search for the annual modulation signature of dark matter interactions. The SABRE collaboration has been developing cutting-edge techniques for the reduction of intrinsic backgrounds over several years. In this paper we report the first characterization of a 3.4 kg crystal, named NaI-33, performed in an underground passive shielding setup at LNGS. NaI-33 has a record low $$^{39}$$ 39 K contamination of 4.3 ± 0.2 ppb as determined by mass spectrometry. We measured a light yield of 11.1 ± 0.2 photoelectrons/keV and an energy resolution of 13.2% (FWHM/E) at 59.5 keV. We evaluated the activities of $$^{226}$$ 226 Ra and $$^{228}$$ 228 Th inside the crystal to be $$5.9\pm 0.6~\upmu $$ 5.9 ± 0.6 μ Bq/kg and $$1.6\pm 0.3~\upmu $$ 1.6 ± 0.3 μ Bq/kg, respectively, which would indicate a contamination from $$^{238}$$ 238 U and $$^{232}$$ 232 Th at part-per-trillion level. We measured an activity of 0.51 ± 0.02 mBq/kg due to $$^{210}$$ 210 Pb out of equilibrium and a $$\alpha $$ α quenching factor of 0.63 ± 0.01 at 5304 keV. We illustrate the analyses techniques developed to reject electronic noise in the lower part of the energy spectrum. A cut-based strategy and a multivariate approach indicated a rate, attributed to the intrinsic radioactivity of the crystal, of $$\sim $$ ∼ 1 count/day/kg/keV in the [5–20] keV region.
Published: 2020
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12. Ten years of cosmic muons observation with Borexino

Author: Davide D’Angelo, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, L. Cappelli, P. Cavalcante, F. Cavanna, A. Chepurnov, K. Choi, D. D’Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X.F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, K. Fomenko, A. Formozov, D. Franco, F. Gabriele, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, C. Hagner, E. Hungerford, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, S. Kumaran, V. Kobychev, G. Korga, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, G. Manuzio, S. Marcocci, J. Maricic, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, O. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M.T. Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, Y. Suvorov, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R.B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, K. Zuber, and G. Zuzel
Subjects: Physics, History, Physics::Instrumentation and Detectors, precision measurement, flux [muon], pi, Astronomy, model [atmosphere], solar, Computer Science Applications, Education, Gran Sasso, modulation, correlation, high [energy], High Energy Physics::Experiment, Borexino, Cosmic muons, temperature [atmosphere], Nuclear Experiment
Abstract: The Borexino detector at Gran Sasso has now accumulated over ten years of continuous data which represent a magnificent opportunity to study the cosmic muon flux at a deep underground location. We present here a precision measurement of the flux and of the expected seasonal modulation. We present the correlation with the atmospheric temperature variations from global atmospheric models. We measure the correlation parameters and infer the kaon-to-pion ratio in the production of cosmic muons from high energy primaries. We also find evidence of a long term modulation that is not present in the atmospheric data and we investigate a possible positive correlation with the solar activity. Finally we observe a seasonal modulation of the production rate of cosmogenic neutrons that is in phase with the muon modulation but shows a surprisingly larger amplitude.
Published: 2020
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13. Updated geoneutrino measurement with Borexino

Author: S. Rottenanger, D. Franco, A. Caminata, B. Caccianiga, E. Unzhakov, I. Lomskaya, Andrea Ianni, L. Oberauer, M. Gschwender, I. Drachnev, K. Zuber, O. Zaimidoroga, V. Atroshchenko, D. Guffanti, O. Smirnov, C. Ghiano, R.B. Vogelaar, F. von Feilitzsch, A. Re, G. Bonfini, M. Wojcik, J. Martyn, G. Zuzel, B. Neumair, X.F. Ding, A. Razeto, K. Altenmüller, G. Manuzio, V. Di Marcello, V. Strati, F. Gabriele, M. Redchuk, D. Semenov, F. Mantovani, V. Orekhov, L. Miramonti, M. Vivier, M. Gromov, M. Nieslony, D. Jeschke, N. Rossi, A. Di Ludovico, D. Bick, A. Onillon, R. Tartaglia, Ö. Penek, C. Hagner, J. Thurn, M. Meyer, L. Cappelli, B. Ricci, S. Zavatarelli, L. Pietrofaccia, M. Montuschi, A. Pocar, E. Hungerford, G. Bellini, T. Lachenmaier, A. Romani, T. Lasserre, L. Papp, A. Goretti, D. Basilico, V. Muratova, A. Sotnikov, J. Maricic, S. Kumaran, C. Galbiati, M. Giammarchi, I. Machulin, Z. Bagdasarian, G. Korga, J. Benziger, M. Agostini, S. Marcocci, A. Derbin, S. Schöinert, M. Pallavicini, Y. Suvorov, F. Ortica, Livia Ludhova, M. Skorokhvatov, M. Misiaszek, G. Ranucci, S. Davini, S. Appel, V. Kobychev, M.T. Ranalli, A. Formozov, P. Lombardi, L. Lukyanchenko, M. Laubenstein, E. Meroni, A. Chepurnov, G. Fiorentini, G. Lukyanchenko, L. Di Noto, N. Pilipenko, E. Litvinovich, A. Di Giacinto, D. D'Angelo, D. Bravo, M. Wurm, Aldo Ianni, A. Vishneva, G. Raikov, F. Calaprice, G. Testera, F. Cavanna, L. Ludhova, P. Cavalcante, A. Jany, and K. Choi
Subjects: data analysis method, History, Particle physics, liquid [scintillation counter], Geoneutrino, Computer Science Applications, Education, geophysics [neutrino], statistics, Environmental science, Borexino, low [background], activity report, experimental results
Abstract: Borexino is a 280-ton liquid scintillator detector located at the Laboratori Nazionali del Gran Sasso (LNGS), Italy and is one of the two detectors that has measured geoneutrinos so far. The unprecedented radio-purity of the scintillator, the shielding with highly purified water, and the placement of the detector at a 3800 m w.e. depth have resulted in very low background levels and has made Borexino an excellent apparatus for geoneutrino measurements. The new update of the Borexino geoneutrino measurement, using the data obtained from December 2007 to April 2019, has been presented. Enhanced analysis techniques, adopted in this measurement, have been also presented (poster presentation #39 by S. Kumaran). The updated statistics and the new elaborate analysis have led to more than a factor two increase in exposure ((1.12 ± 0.05) × 1032 protons × yr) when compared to the latest Borexino result from 2015. The resulting geoneutrino signal of 47.0 − 7.7 + 8.4 ( stat ) − 1.9 + 2.4 ( sys ) TNU has − 17.2 + 18.3 % total precision. The geological interpretations of this measurement have been discussed. In particular, the 99% C.L. observation of the mantle signal by exploiting the relatively well-known lithospheric contribution, the estimation of the radiogenic heat, as well as the comparison of these results to the predictions based on different geological models. The upper limits on the power of a hypothetical georeactor that might be present at different locations inside the Earth have been set.
Published: 2020
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14. Constraints on Flavor-Diagonal Non-Standard Neutrino Interactions from Borexino Phase-II

Author: G. Korga, D. Jeschke, Z. Bagdasarian, S. Appel, E. Litvinovich, K. Fomenko, Michael Wurm, M. Gschwender, Matthias Laubenstein, B. Caccianiga, Ö. Penek, F. Calaprice, Sanjib Kumar Agarwalla, J. Thurn, L. Lukyanchenko, J. Martyn, F. Gabriele, D. Bick, Sandra Zavatarelli, G. Raikov, Livia Ludhova, A. M. Goretti, A. S. Chepurnov, Tatsu Takeuchi, O. Zaimidoroga, E. Meroni, G. Zuzel, Cristiano Galbiati, P. Cavalcante, Gioacchino Ranucci, B. Neumair, D. Guffanti, M. Nieslony, D. Bravo, Fausto Ortica, G. Lukyanchenko, G. Testera, Tobias Lachenmaier, Marco Giammarchi, G. Bellini, A. Sotnikov, R. Tartaglia, N. Rossi, D. Semenov, Kai Zuber, Aldo Ianni, S. Kumaran, E. V. Unzhakov, Xuefeng Ding, A. Vishneva, A. Di Ludovico, Matteo Agostini, D. Franco, J. Maricic, Andrey Formozov, D. Basilico, M. Skorokhvatov, N. Pilipenko, F. von Feilitzsch, Y. Suvorov, S. Rottenanger, L. Oberauer, V. N. Muratova, Caren Hagner, M. Gromov, M. Meyer, Andrea Ianni, A. Di Giacinto, A. Razeto, G. Manuzio, I. N. Machulin, A. V. Derbin, M. Misiaszek, Marco Pallavicini, D. D'Angelo, C. Ghiano, A. Jany, L. Cappelli, L. Pietrofaccia, A. Pocar, Marcin Wójcik, V. Atroshchenko, Chen Sun, M. Redchuk, Paolo Lombardi, Lino Miramonti, V. Di Marcello, V. V. Kobychev, E. Hungerford, I. Drachnev, F. Cavanna, K. Altenmüller, R. B. Vogelaar, Alessandra Re, A. Caminata, V. Orekhov, S. Marcocci, G. Bonfini, J. Benziger, K. Choi, S. Davini, Aldo Romani, L. Papp, L. Di Noto, Oleg Smirnov, Stefan Schönert, Agarwalla, S. K., Agostini, M., Altenmuller, K., Appel, S., Atroshchenko, V., Bagdasarian, Z., Basilico, D., Bellini, G., Benziger, J., Bick, D., Bonfini, G., Bravo, D., Caccianiga, B., Calaprice, F., Caminata, A., Cappelli, L., Cavalcante, P., Cavanna, F., Chepurnov, A., Choi, K., D'Angelo, D., Davini, S., Derbin, A., Di Giacinto, A., Di Marcello, V., Ding, X. F., Di Ludovico, A., Di Noto, L., Drachnev, I., Fomenko, K., Formozov, A., Franco, D., Gabriele, F., Galbiati, C., Gschwender, M., Ghiano, C., Giammarchi, M., Goretti, A., Gromov, M., Guffanti, D., Hagner, C., Hungerford, E., Ianni, A., Jany, A., Jeschke, D., Kumaran, S., Kobychev, V., Korga, G., Lachenmaier, T., Laubenstein, M., Litvinovich, E., Lombardi, P., Ludhova, L., Lukyanchenko, G., Lukyanchenko, L., Machulin, I., Manuzio, G., Marcocci, S., Maricic, J., Martyn, J., Meroni, E., Meyer, M., Miramonti, L., Misiaszek, M., Muratova, V., Neumair, B., Nieslony, M., Oberauer, L., Orekhov, V., Ortica, F., Pallavicini, M., Papp, L., Penek, O., Pietrofaccia, L., Pilipenko, N., Pocar, A., Raikov, G., Ranucci, G., Razeto, A., Re, A., Redchuk, M., Romani, A., Rossi, N., Rottenanger, S., Schonert, S., Semenov, D., Skorokhvatov, M., Smirnov, O., Sotnikov, A., Sun, C., Suvorov, Y., Takeuchi, T., Tartaglia, R., Testera, G., Thurn, J., Unzhakov, E., Vishneva, A., Vogelaar, R. B., von Feilitzsch, F., Wojcik, M., Wurm, M., Zaimidoroga, O., Zavatarelli, S., Zuber, K., Zuzel, G., Agarwalla, S, Agostini, M, Altenmuller, K, Appel, S, Atroshchenko, V, Bagdasarian, Z, Basilico, D, Bellini, G, Benziger, J, Bick, D, Bonfini, G, Bravo, D, Caccianiga, B, Calaprice, F, Caminata, A, Cappelli, L, Cavalcante, P, Cavanna, F, Chepurnov, A, Choi, K, D'Angelo, D, Davini, S, Derbin, A, Di Giacinto, A, Di Marcello, V, Ding, X, Di Ludovico, A, Di Noto, L, Drachnev, I, Fomenko, K, Formozov, A, Franco, D, Gabriele, F, Galbiati, C, Gschwender, M, Ghiano, C, Giammarchi, M, Goretti, A, Gromov, M, Guffanti, D, Hagner, C, Hungerford, E, Ianni, A, Jany, A, Jeschke, D, Kumaran, S, Kobychev, V, Korga, G, Lachenmaier, T, Laubenstein, M, Litvinovich, E, Lombardi, P, Ludhova, L, Lukyanchenko, G, Lukyanchenko, L, Machulin, I, Manuzio, G, Marcocci, S, Maricic, J, Martyn, J, Meroni, E, Meyer, M, Miramonti, L, Misiaszek, M, Muratova, V, Neumair, B, Nieslony, M, Oberauer, L, Orekhov, V, Ortica, F, Pallavicini, M, Papp, L, Penek, O, Pietrofaccia, L, Pilipenko, N, Pocar, A, Raikov, G, Ranucci, G, Razeto, A, Re, A, Redchuk, M, Romani, A, Rossi, N, Rottenanger, S, Schonert, S, Semenov, D, Skorokhvatov, M, Smirnov, O, Sotnikov, A, Sun, C, Suvorov, Y, Takeuchi, T, Tartaglia, R, Testera, G, Thurn, J, Unzhakov, E, Vishneva, A, Vogelaar, R, von Feilitzsch, F, Wojcik, M, Wurm, M, Zaimidoroga, O, Zavatarelli, S, Zuber, K, Zuzel, G, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Borexino, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Physics
Subjects: Physics - Instrumentation and Detectors, neutrino: solar, Physics::Instrumentation and Detectors, Solar neutrino, Physics beyond the Standard Model, Electron, metal: solar, 01 natural sciences, neutrino: flux, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), solar [model], elastic scattering [neutrino electron], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], neutrino/e: coupling, detector [neutrino], Borexino, Physics, Elastic scattering, interaction [neutrino/tau], new physics, Beyond Standard Model, Neutrino Physics, Instrumentation and Detectors (physics.ins-det), neutrino electron: elastic scattering, coupling [neutrino/e], nuclear reactor [antineutrino], High Energy Physics - Phenomenology, neutrino: detector, Astrophysics - Solar and Stellar Astrophysics, coupling [neutrino], solar [neutrino], Neutrino, precision measurement [Weinberg angle], model: solar, Nuclear and High Energy Physics, Particle physics, sensitivity [detector], FOS: Physical sciences, neutrino/tau: interaction, neutral current: coupling, Weinberg angle: precision measurement, neutrino: new interaction, neutrino: spectrum, 0103 physical sciences, antineutrino: nuclear reactor, neutrino: coupling, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, 010306 general physics, Solar and Stellar Astrophysics (astro-ph.SR), Standard solar model, chiral [coupling], Neutral current, 010308 nuclear & particles physics, solar [metal], High Energy Physics::Phenomenology, coupling [neutral current], spectrum [neutrino], flux [neutrino], coupling: chiral, detector: sensitivity, new interaction [neutrino], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], lcsh:QC770-798, High Energy Physics::Experiment, Neutrino Physic
Abstract: The Borexino detector measures solar neutrino fluxes via neutrino-electron elastic scattering. Observed spectra are determined by the solar-$\nu_{e}$ survival probability $P_{ee}(E)$, and the chiral couplings of the neutrino and electron. Some theories of physics beyond the Standard Model postulate the existence of Non-Standard Interactions (NSI's) which modify the chiral couplings and $P_{ee}(E)$. In this paper, we search for such NSI's, in particular, flavor-diagonal neutral current interactions that modify the $\nu_e e$ and $\nu_\tau e$ couplings using Borexino Phase II data. Standard Solar Model predictions of the solar neutrino fluxes for both high- and low-metallicity assumptions are considered. No indication of new physics is found at the level of sensitivity of the detector and constraints on the parameters of the NSI's are placed. In addition, with the same dataset the value of $\sin^2\theta_W$ is obtained with a precision comparable to that achieved in reactor antineutrino experiments., Comment: 28 pages, 7 figures. Slight modifications in the title, abstract, and conclusion. Few references added. Text expanded for clarity. Accepted in JHEP
Published: 2019
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15. First real time detection of 7Be solar neutrinos by Borexino

Author: A. Martemianov, S. Gazzana, K. McCarty, Andrew Sonnenschein, Malcolm J. Joyce, M. Misiaszek, Cristiano Galbiati, S. Vitale, G. Manuzio, S. Hardy, C. Salvo, O. Smirnov, Hardy Simgen, Matthias Laubenstein, V. Muratova, M. E. Monzani, O. Zaimidoroga, A. Pocar, Andrea Ianni, Sandra Zavatarelli, A.V. Etenko, Aldo Ianni, M. Goeger-Neff, G. Testera, A. Razeto, Livia Ludhova, V. G. Tarasenkov, D. Franco, F. Dalnoki-Veress, R. Tartaglia, L. Papp, G. Bellini, R. J. Ford, R. S. Raghavan, Marco Giammarchi, C. Arpesella, S. Bonetti, Marcin Wójcik, G. Korga, D. Kryn, Fausto Masetti, A. A. Sabelnikov, Paolo Lombardi, M. Skorokhvatov, C. Grieb, S. V. Sukhotin, Y. Suvorov, R. B. Vogelaar, Martin Deutsch, S. Schönert, L. Oberauer, M. Obolensky, H. de Kerret, L. Perasso, Fausto Ortica, I. Machulin, E. Litvinovich, B. Caccianiga, F. Calaprice, F. von Feilitzsch, L. Niedermeier, Michael K.H. Leung, B. Freudiger, Marco Pallavicini, D. D'Angelo, K. Fomenko, J. Benziger, G. Zuzel, A. Sotnikov, A. Derbin, E. Meroni, A. Goretti, G. Heusser, Gioacchino Ranucci, D. Montanari, D. Vignaud, Lino Miramonti, APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Borexino, Arpesella, C., Suvorov, Y., Et, Al., Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)
Subjects: Low background detector, Nuclear and High Energy Physics, Particle physics, Liquid scintillator, Neutrino oscillation, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Physics::Instrumentation and Detectors, Solar neutrino, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 01 natural sciences, 7. Clean energy, Neutrino Oscillations, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Nuclear physics, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Borexino, Physics, ICARUS, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), High Energy Physics::Phenomenology, Solar neutrino problem, Low Background Detectors, Liquid Scintillators, 3. Good health, Solar Neutrinos, High Energy Physics - Phenomenology, Neutrino detector, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino
Abstract: This paper reports a direct measurement of the Be7 solar neutrino signal rate performed with the Borexino low background liquid scintillator detector. This is the first real-time spectral measurement of sub-MeV solar neutrinos. The result for 0.862 MeV Be7 is 47 +- 7 (stat} +- 12 (sys} counts/(day x 100 ton), consistent with predictions of Standard Solar Models and neutrino oscillations with LMA-MSW parameters., Paper submitted to PRLB. 9 pages, 6 figures (EPS) PDF files included into tar.gz file, together with LaTeX source, eps figs and style files
Published: 2008
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16. Recent results from Borexino

Author: G Testera, M Agostin, K Altenmüller, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D’Angelo, S Davini, A Derbin, L Di Noto, I Drachnev, A Etenko, K Fomenko, D Franco, F Gabriele, C Galbiati, C Ghiano, M Giammarchi, M Göger-Neff, A Goretti, M Gromov, C Hagner, E Hungerford, Aldo Ianni, Andrea Ianni, K Jedrzejczak, M Kaiser, V Kobychev, D Korablev, G Korga, D Kryn, M Laubenstein, B Lehnert, E Litvinovich, F Lombardi, P Lombardi, L Ludhova, G Lukyanchenko, I Machulin, S Manecki, W Maneschg, S Marcocci, E Meroni, M Meyer, L Miramonti, M Misiaszek, M Montuschi, P Mosteiro, V Muratova, B Neumair, L Oberauer, M Obolensky, F Ortica, M Pallavicini, L Papp, L Perasso, A Pocar, G Ranucci, A Razeto, A Re, A Romani, R Roncin, N Rossi, S Schönert, D Semenov, H Simgen, M Skorokhvatov, O Smirnov, A Sotnikov, S Sukhotin, Y Suvorov, R Tartaglia, J Thurn, M Toropova, E Unzhakov, A Vishneva, RB Vogelaar, F von Feilitzsch, H Wang, S Weinz, J Winter, M Wojcik, M Wurm, Z Yokley, O Zaimidoroga, S Zavatarelli, K Zuber, G Zuzel, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: History, neutrino: solar, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, energy spectrum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Computer Science Applications, Education, Physics and Astronomy (all), 0103 physical sciences, charge: conservation law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Borexino, 010306 general physics, experimental results, energy: low
Abstract: International audience; We review the solar neutrinos results of Borexino and the limit on the charge conservation obtained in the context of the analysis of the low energy region of the energy spectrum.
Published: 2016
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17. Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth

Author: L. Oberauer, V. N. Muratova, A. E. Chavarria, L. Perasso, A.V. Etenko, D. Bravo, C. Salvo, O. Zaimidoroga, Michael Wurm, L. Grandi, M. Göger-Neff, R. Möllenberg, S. Perasso, R. Tartaglia, S. V. Sukhotin, Laura Cadonati, G. Korga, Andrea Ianni, A. Wright, Jilei Xu, Y. Suvorov, D. Franco, G. Zuzel, Livia Ludhova, G. Testera, Fausto Ortica, A. M. Goretti, V. V. Kobychev, A. S. Chepurnov, A. V. Derbin, K. Otis, I. Machulin, A. Sotnikov, Aldo Ianni, Gioacchino Ranucci, A. Empl, Stefan Schönert, G. Bonfini, P. Cavalcante, S. Davini, Q. Meindl, C. Ghiano, M. Obolensky, W. Maneschg, G. Lukyanchenko, R. Saldanha, P. J. Mosteiro, E. Litvinovich, S. Manecki, G. Bellini, K. Fomenko, F. von Feilitzsch, B. Caccianiga, D. Bick, Sandra Zavatarelli, Marco Giammarchi, J. Winter, Aldo Romani, L. Papp, F. Calaprice, Lino Miramonti, S. Gazzana, Cristiano Galbiati, Oleg Smirnov, N. Rossi, A. Pocar, Caren Hagner, D. Vignaud, Marco Pallavicini, D. D'Angelo, D. Korablev, T. Lewke, E. Hungerford, M. Misiaszek, M. Skorokhvatov, Marcin Wójcik, M. Buizza Avanzini, R. B. Vogelaar, Hardy Simgen, Paolo Lombardi, Alessandra Re, Matthias Laubenstein, A. Razeto, G. Manuzio, D. Kryn, B. Loer, J. Benziger, F. Lombardi, E. Meroni, Physics Department, Amherst U., University of Massachusetts System (UMASS), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratori Nazionali del Gran Sasso (LNGS), Istituto Nazionale di Fisica Nucleare (INFN), Laboratoire Kastler Brossel (LKB (Jussieu)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Dept. Microelectronics and Nanoscience, Chalmers University of Technology [Göteborg], departement de physique, Albert-Ludwigs-Universität Freiburg, Dip. di Fisica dell'Università di Genova - Italy, Università degli studi di Torino (UNITO), Departamento de Engenharia Elétrica [Minas Gerais] (DEE - UFMG), Universidade Federal de Minas Gerais, Rhodes University, Grahamstown, Laboratoire de Spectroscopie Hertzienne de l'ENS (LSH-ENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Institute of Physics, Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences (PAN), International Iberian Nanotechnology Laboratory (INL), Bellini, G., Suvorov, Y., Et, Al., Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Università degli studi di Genova = University of Genoa (UniGe), and Università degli studi di Torino = University of Turin (UNITO)
Subjects: Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Solar neutrino, Monte Carlo method, dark matter experiment, cosmic ray experiment, FOS: Physical sciences, Scintillator, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), neutrino experiments, 0103 physical sciences, Neutron, 010306 general physics, Borexino, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Muon, 010308 nuclear & particles physics, dark matter experiments, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Neutron capture, Neutrino detector, neutrino experiment, High Energy Physics::Experiment, cosmic ray experiments, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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 Yn =(3.10+-0.11)10-4 n/({\mu} (g/cm2)). 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 12N, 12B, 8He, 9C, 9Li, 8B, 6He, 8Li, 11Be, 10C and 11C. 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 11C 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., Comment: 26 pages, 13 figures (in 14 files), 4 tables. 3 extra data files. accepted by JCAP
Published: 2013
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18. Lifetime measurements of 214Po and 212Po with the CTF liquid scintillator detector at LNGS

Author: R. B. Vogelaar, Alessandra Re, Matthias Laubenstein, C. Carraro, P. Cavalcante, W. Maneschg, A. Razeto, G. Manuzio, J. Benziger, Michael Wurm, L. Grandi, A. Pocar, V. Chubakov, M. Skorokhvatov, F. Lombardi, D. Korablev, D. Bick, Sandra Zavatarelli, F. von Feilitzsch, Fabio Mantovani, S. Perasso, S. Davini, S. Nisi, G. Zuzel, L. Oberauer, R. Saldanha, S. Manecki, M. Buizza Avanzini, V. N. Muratova, A. E. Chavarria, G. Testera, Hardy Simgen, L. Perasso, A. Sotnikov, Aldo Ianni, Marco Giammarchi, Y. Suvorov, Q. Meindl, A.V. Etenko, Gioacchino Ranucci, D. Kryn, D. Franco, D. Bravo, Aldo Romani, L. Papp, Laura Cadonati, E. Meroni, N. Rossi, Fausto Ortica, I. Machulin, Marco Pallavicini, D. D'Angelo, C. Salvo, O. Zaimidoroga, B. Loer, Yusuke Koshio, Andrea Ianni, M. Obolensky, A. V. Derbin, M. M. Wojcik, Cristiano Galbiati, Oleg Smirnov, G. Bellini, Paolo Lombardi, M. Göger-Neff, E. Guardincerri, S. V. Sukhotin, A. Wright, D. Montanari, V. V. Kobychev, Stefan Schönert, Livia Ludhova, A. A. Sabelnikov, A. M. Goretti, A. S. Chepurnov, S. Hardy, Marcello Lissia, C. Ghiano, Jilei Xu, K. Otis, P. J. Mosteiro, G. Bonfini, Lino Miramonti, T. Lewke, R. Tartaglia, G. Korga, E. Litvinovich, K. Fomenko, S. Gazzana, B. Caccianiga, F. Calaprice, J. Winter, Gerti Xhixha, M. Misiaszek, Borexino Collaboration, Physics Department, University of Massachusetts System (UMASS), AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratori Nazionali del Gran Sasso (LNGS), Istituto Nazionale di Fisica Nucleare (INFN), Dept. Microelectronics and Nanoscience, Chalmers University of Technology [Göteborg], Paul Scherrer Institute (PSI), Rhodes University, Grahamstown, Laboratoire de Spectroscopie Hertzienne de l'ENS (LSH-ENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), International Iberian Nanotechnology Laboratory (INL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Bellini, G., Suvorov, Y., and Et, Al.
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Nuclear Theory, Hadron, FOS: Physical sciences, Scintillator, 01 natural sciences, Coincidence, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear fusion, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear theory, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Test facility, 010308 nuclear & particles physics, Detector, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Phenomenology, National laboratory, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: We have studied the alpha decays of 214Po into 210Pb and of 212Po into 208Pb tagged by the coincidence with the preceding beta decays from 214Bi and 212Bi, respectively. The employed 222Rn, 232Th, and 220Rn sources were sealed inside quartz vials and inserted in the Counting Test Facility at the underground Gran Sasso National Laboratory in Italy. We find that the mean lifetime of 214Po is (236.00 +- 0.42(stat) +- 0.15(syst)) \mu s and that of 212Po is (425.1 +- 0.9(stat) +- 1.2(syst)) ns. Our results, obtained from data with signal-to-background ratio larger than 1000, reduce the overall uncertainties and are compatible with previous measurements., Comment: RevTex, 11 pages, 5 figures, 3 tables. This second version matches the one accepted for publication in EPJA: minor stylistic changes plus a discussion of calibration of TDC time scale
Published: 2013
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19. Borexino calibrations: Hardware, Methods, and Results

Author: Cristiano Galbiati, A. Razeto, E. Litvinovich, R. Saldanha, F. von Feilitzsch, B. Caccianiga, S. Gazzana, F. Calaprice, Marco Giammarchi, D. Vignaud, Laura Cadonati, Livia Ludhova, A. Kayunov, Jilei Xu, T. Lewke, Fausto Ortica, Y. Suvorov, I. Machulin, G. Zuzel, L. Oberauer, P. Cavalcante, R. Tartaglia, K. Otis, S. Kidner, M. Obolensky, A. E. Chavarria, W. Maneschg, M. Goeger-Neff, M. Skorokhvatov, A. Sotnikov, Aldo Ianni, L. Perasso, R. B. Vogelaar, Matthias Laubenstein, V. Muratova, P. J. Mosteiro, A.V. Etenko, Michael Wurm, L. Grandi, Lino Miramonti, Alessandra Re, D. Franco, S. V. Sukhotin, G. Korga, Andrea Ianni, D. Bravo, D. Bick, Sandra Zavatarelli, A. Wright, V. V. Kobychev, A. Pocar, Stefan Schönert, D. Rountree, A. Derbin, R. S. Raghavan, A. Goretti, D. Korablev, D. Kryn, G. Bonfini, C. Ghiano, N. Rossi, E. Meroni, Paolo Lombardi, G. Bellini, Marco Pallavicini, D. D'Angelo, C. Salvo, Marcin Wójcik, S. Manecki, M. Buizza Avanzini, S. Hardy, O. Zaimidoroga, K. Fomenko, Hardy Simgen, S. Davini, J. Benziger, F. Lombardi, Gioacchino Ranucci, C. Carraro, D. Montanari, G. Fernandes, S. Perasso, Q. Meindl, Aldo Romani, L. Papp, E. Guardincerri, G. Manuzio, G. Testera, A. A. Sabelnikov, J. Winter, M. Misiaszek, O. Smirnov, H. O. Back, B. Loer, Yusuke Koshio, Borexino collaboration, H, Back, G, Bellini, Suvorov, Yury, and Et, Al.
Subjects: Calorimeter, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Solar neutrino, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Scintillator, Large detector systems for particle and astroparticle physic, Calibration, Environmental science, Neutrino, Instrumentation, Borexino, Mathematical Physics, Remote sensing
Abstract: Borexino was the first experiment to detect solar neutrinos in real-time in the sub-MeV region. In order to achieve high precision in the determination of neutrino rates, the detector design includes an internal and an external calibration system. This paper describes both calibration systems and the calibration campaigns that were carried out in the period between 2008 and 2011. We discuss some of the results and show that the calibration procedures preserved the radiopurity of the scintillator. The calibrations provided a detailed understanding of the detector response and led to a significant reduction of the systematic uncertainties in the Borexino measurements.
Published: 2012

20. Cosmic-muon flux and annual modulation in Borexino at 3800 m water-equivalent depth

Author: Jilei Xu, R. Tartaglia, K. Otis, D. Vignaud, G. Testera, C. Carraro, A. Sotnikov, Aldo Ianni, Caren Hagner, G. Zuzel, P. J. Mosteiro, T. Lewke, L. Oberauer, J. Benziger, V. N. Muratova, P. Cavalcante, A. Razeto, A. E. Chavarria, G. Manuzio, S. Manecki, W. Maneschg, L. Perasso, Gioacchino Ranucci, C. Ghiano, F. Lombardi, S. Davini, M. Misiaszek, Cristiano Galbiati, Y. Suvorov, A. Pocar, Michael Wurm, L. Grandi, B. Loer, M. Skorokhvatov, Yusuke Koshio, H. Simgen, Oleg Smirnov, D. Korablev, D. Kryn, C. Salvo, Matthias Laubenstein, G. Bonfini, M. Buizza Avanzini, E. Litvinovich, K. Fomenko, E. Guardincerri, F. von Feilitzsch, J. Winter, R. Saldanha, D. Montanari, R. S. Raghavan, Paolo Lombardi, B. Caccianiga, S. Gazzana, O. Zaimidoroga, A.V. Etenko, S. Hardy, S. V. Sukhotin, F. Calaprice, Laura Cadonati, Marco Giammarchi, D. Bravo, R. B. Vogelaar, Lino Miramonti, A. Wright, M. Goeger-Neff, E. Meroni, Alessandra Re, Fausto Ortica, I. Machulin, Stefan Schönert, D. Franco, G. Bellini, M. Obolensky, Livia Ludhova, A. A. Sabelnikov, A. M. Goretti, A. S. Chepurnov, Andrea Ianni, D. Bick, A. V. Derbin, Sandra Zavatarelli, M. M. Wojcik, S. Perasso, Q. Meindl, Aldo Romani, L. Papp, Marco Pallavicini, D. D'Angelo, G. Korga, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Borexino, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Bellini, G., Suvorov, Y., and Et, Al.
Subjects: Particle physics, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], FOS: Physical sciences, Water equivalent, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Relative amplitude, Borexino, Physics, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], COSMIC cancer database, Muon, 010308 nuclear & particles physics, Astronomy and Astrophysics, Atmospheric temperature, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Physics - Atmospheric and Oceanic Physics, neutrino detector, 13. Climate action, Modulation, Atmospheric and Oceanic Physics (physics.ao-ph), Muon flux, neutrino experiment, Astrophysics - Instrumentation and Methods for Astrophysics
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) \times 10-4m-2s-1 using four years of Borexino data. A modulation of this signal is observed with a period of (366\pm3) 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., Comment: 14 pages, 8 figures, published on JCAP as JCAP05(2012)015 on May 15th 2012
Published: 2012
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21. First evidence of pep solar neutrinos by direct detection in Borexino

Author: A.V. Etenko, A. Pocar, D. Bravo, R. Tartaglia, Livia Ludhova, Denis Korablev, A. S. Chepurnov, A. Razeto, S. Davini, S. Schönert, Marcin Wójcik, G. Manuzio, B. Loer, R. S. Raghavan, C. Ghiano, G. Zuzel, R. B. Vogelaar, M. Obolensky, R. Saldanha, Yusuke Koshio, M. Goeger-Neff, K. Otis, Y. Suvorov, D. Montanari, Alessandra Re, L. Oberauer, A. A. Sabelnikov, P. Cavalcante, A. Derbin, M. Misiaszek, A. E. Chavarria, L. Perasso, Aldo Ianni, Marco Giammarchi, A. Sotnikov, E. Litvinovich, E. Meroni, F. Lombardi, V. Muratova, B. Caccianiga, P. J. Mosteiro, J. Benziger, Andrea Ianni, F. Calaprice, D. Bick, Sandra Zavatarelli, C. Salvo, O. Zaimidoroga, A. Goretti, E. Guardincerri, O. Smirnov, G. Testera, S. Manecki, Aldo Romani, L. Papp, Paolo Lombardi, J. Winter, S. Perasso, S. V. Sukhotin, Gioacchino Ranucci, A. Wright, Jingke Xu, Cristiano Galbiati, G. Bellini, S. Hardy, M. Skorokhvatov, Matthias Laubenstein, J. Quirk, T. Lewke, D. Kryn, Marco Pallavicini, D. D'Angelo, Stefano Bonetti, K. Fomenko, S. Gazzana, Michael Wurm, L. Grandi, Q. Meindl, F. von Feilitzsch, W. Maneschg, Laura Cadonati, Fausto Ortica, I. Machulin, Lino Miramonti, D. Vignaud, G. Korga, D. Franco, G. Bonfini, M. Buizza Avanzini, Hardy Simgen, C. Carraro, Bellini, G., Suvorov, Y., Et, Al., APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), AstroParticule et Cosmologie (APC (UMR_7164)), Borexino, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Subjects: History, Metallicity, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrinos, General Physics and Astronomy, FOS: Physical sciences, Astrophysics, 01 natural sciences, Main-sequence: late-type stars, Education, High Energy Physics - Experiment, 26.65.+t, 14.60.Lm, 95.55.Vj, 97.20.Jg, Nuclear physics, Physics and Astronomy (all), High Energy Physics - Experiment (hep-ex), Ordinary neutrinos (nuW bosons, muon, 0103 physical sciences, Neutrino, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Astrophysics::Solar and Stellar Astrophysics, 010306 general physics, Neutrino oscillation, Borexino, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Range (particle radiation), Standard solar model, Muon, 010308 nuclear & particles physics, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], High Energy Physics::Phenomenology, pion, cosmic ray detectors, [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], and other elementary particle detectors, Computer Science Applications, 3. Good health, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Physics::Space Physics, High Energy Physics::Experiment
Abstract: We observed, for the first time, solar neutrinos in the 1.0-1.5 MeV energy range. We measured the rate of pep solar neutrino interactions in Borexino to be [3.1+-0.6(stat)+-0.3(syst)] counts/(day x 100 ton) and provided a constraint on the CNO solar neutrino interaction rate of, Submitted to Physical Review Letters (2011)
Published: 2011
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22. New experimental limits on the Pauli-forbidden transitions inC12nuclei obtained with485days Borexino data

Author: G. Bellini, S. Bonetti, M. Buizza Avanzini, B. Caccianiga, D. D’Angelo, D. Franco, M. Giammarchi, P. Lombardi, L. Ludhova, E. Meroni, L. Miramonti, L. Perasso, G. Ranucci, A. Re, Y. Suvorov, J. Benziger, L. Cadonati, A. Pocar, F. Calaprice, A. Chavarria, F. Dalnoki-Veress, C. Galbiati, A. Goretti, Andrea Ianni, M. Leung, B. Loer, R. Saldanha, J. Xu, C. Carraro, S. Davini, E. Guardincerri, G. Manuzio, M. Pallavicini, S. Perasso, P. Risso, C. Salvo, G. Testera, S. Zavatarelli, H. de Kerret, D. Kryn, M. Obolensky, D. Vignaud, A. Derbin, V. Muratova, A. Etenko, E. Litvinovich, I. Machulin, A. Sabelnikov, M. Skorokhvatov, S. Sukhotin, K. Fomenko, O. Smirnov, A. Sotnikov, O. Zaimidoroga, S. Gazzana, C. Ghiano, Aldo Ianni, G. Korga, D. Montanari, A. Razeto, R. Tartaglia, M. Goeger-Neff, T. Lewke, Q. Meindl, L. Oberauer, F. von Feilitzsch, Y. Winter, M. Wurm, C. Grieb, S. Hardy, M. Joyce, S. Manecki, L. Papp, R. S. Raghavan, D. Rountree, R. B. Vogelaar, W. Maneschg, S. Schönert, H. Simgen, G. Zuzel, M. Misiaszek, M. Wojcik, F. Ortica, and A. Romani
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, 010308 nuclear & particles physics, Hadron, Carbon-12, Elementary particle, Fermion, 01 natural sciences, 7. Clean energy, Baryon, 0103 physical sciences, 010306 general physics, Nucleon, Lepton
Abstract: The Pauli exclusion principle (PEP) has been tested for nucleons ($n,p$) in $^{12}C$ with the Borexino detector.The approach consists of a search for $\gamma$, $n$, $p$ and $\beta^\pm$ emitted in a non-Paulian transition of 1$P_{3/2}$- shell nucleons to the filled 1$S_{1/2}$ shell in nuclei. Due to the extremely low background and the large mass (278 t) of the Borexino detector, the following most stringent up-to-date experimental bounds on PEP violating transitions of nucleons have been established: $\tau({^{12}\rm{C}}\to{^{12}\widetilde{\rm{C}}}+\gamma) \geq 5.0\cdot10^{31}$ y, $\tau({^{12}\rm{C}}\to{^{11}\widetilde{\rm{B}}}+ p) \geq 8.9\cdot10^{29}$ y, $\tau({^{12}\rm{C}}\to{^{11}\widetilde{\rm{C}}}+ n) \geq 3.4 \cdot 10^{30}$ y, $\tau({^{12}\rm{C}}\to{^{12}\widetilde{\rm{N}}}+ e^- + \widetilde{\nu_e}) \geq 3.1\cdot 10^{30}$ y and $\tau({^{12}\rm{C}}\to{^{12}\widetilde{\rm{B}}}+ e^+ + \nu_e) \geq 2.1 \cdot 10^{30}$ y, all at 90% C.L. The corresponding upper limits on the relative strengths for the searched non-Paulian electromagnetic, strong and weak transitions have been estimated: $\delta^2_{\gamma} \leq 2.2\cdot10^{-57}$, $\delta^2_{N} \leq 4.1\cdot10^{-60}$ and $\delta^2_{\beta} \leq 2.1\cdot10^{-35}$.
Published: 2010
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23. Observation of Geo-Neutrinos

Author: W. Maneschg, F. Dalnoki-Veress, G. Zuzel, P. Risso, R. Tartaglia, Matthias Laubenstein, A. A. Sabelnikov, A. Razeto, M. Skorokhvatov, G. Bellini, R. Saldanha, Michael Wurm, C. Salvo, Jilei Xu, Aldo Romani, L. Papp, A. Goretti, M. Goeger-Neff, Marco Giammarchi, S. Davini, Malcolm J. Joyce, S. Gazzana, S. Perasso, J. Winter, D. Franco, C. Ghiano, R. B. Vogelaar, Q. Meindl, Barbara Ricci, E. Litvinovich, M. Misiaszek, G. Manuzio, Gioacchino Ranucci, A. Sotnikov, O. Zaimidoroga, Alessandra Re, B. Caccianiga, F. Calaprice, E. Guardincerri, T. Lewke, D. Kryn, Cristiano Galbiati, G. Testera, O. Smirnov, Livia Ludhova, A.V. Etenko, D. Vignaud, Giovanni Fiorentini, D. Montanari, D. Rountree, Stefano Bonetti, A. Pocar, B. Loer, Yusuke Koshio, R. S. Raghavan, Aldo Ianni, Marcin Wójcik, Y. Suvorov, L. Oberauer, A. E. Chavarria, L. Perasso, S. Schönert, S. Hardy, Lino Miramonti, Andrea Ianni, Sandra Zavatarelli, S. Manecki, Michael K.H. Leung, V. Muratova, K. Fomenko, Marco Pallavicini, D. D'Angelo, A. Derbin, E. Meroni, J. Benziger, Laura Cadonati, G. Korga, Fausto Ortica, I. Machulin, F. von Feilitzsch, M. Buizza Avanzini, Hardy Simgen, C. Carraro, S. V. Sukhotin, A. Wright, V. V. Kobychev, Paolo Lombardi, M. Obolensky, H. de Kerret, APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Borexino, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Bellini, G., Suvorov, Y., and Et, Al.
Subjects: Nuclear and High Energy Physics, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Anti-neutrinos from reactors, Geoneutrino, Physics::Instrumentation and Detectors, Solar neutrino, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Anti-neutrinos from reactors, Geo-neutrino, Neutrino detector, 01 natural sciences, 7. Clean energy, NO, Physics::Geophysics, High Energy Physics - Experiment, Neutrino detector, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Nuclear Experiment, Borexino, Physics, Anti-neutrinos from reactor, 010308 nuclear & particles physics, Astronomy, Solar neutrino problem, humanities, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Cosmic neutrino background, Geo-neutrino, 13. Climate action, Measurements of neutrino speed, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Neutrino astronomy
Abstract: Geo-neutrinos, electron anti-neutrinos produced in beta decays of naturally occurring radioactive isotopes in the Earth, are a unique direct probe of our planet's interior. We report the first observation at more than 3$\sigma$ C.L. of geo-neutrinos, performed with the Borexino detector at Laboratori Nazionali del Gran Sasso. Anti-neutrinos are detected through the neutron inverse beta decay reaction. With a 252.6 ton-yr fiducial exposure after all selection cuts, we detected 9.9^{+4.1}_{-3.4}(^{+14.6}_{-8.2}) geo-neutrino events, with errors corresponding to a 68.3%(99.73%) C.L. From the $\ln{\cal{L}}$ profile, the statistical significance of the Borexino geo-neutrino observation corresponds to a 99.997% C.L. Our measurement of the geo-neutrinos rate is 3.9^{+1.6}_{-1.3}(^{+5.8}_{-3.2}) events/(100ton-yr). This measurement rejects the hypothesis of an active geo-reactor in the Earth's core with a power above 3 TW at 95% C.L. The observed prompt positron spectrum above 2.6 MeV is compatible with that expected from european nuclear reactors (mean base line of approximately 1000 km). Our measurement of reactor anti-neutrinos excludes the non-oscillation hypothesis at 99.60% C.L., Comment: 8 pages, 4 figures, 3 tables
Published: 2010
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24. The Borexino detector at the Laboratori Nazionali del Gran Sasso

Author: V. Vyrodov, D. Bondi, Malcolm J. Joyce, Laura Cadonati, T. Goldbrunner, T. Hertich, E. de Haas, O. Smirnov, F. von Feiltitsch, M. Misiaszek, W. Czech, Matthias Laubenstein, A. de Bellefon, A. Martemiano, W. Maneschg, Stefano Nisi, M. Marchelli, M. Parodi, Stefano Bonetti, D. Manuzio, Marco Pallavicini, V. M. Gehman, A. Alimonti, Augusto Brigatti, D. Bartolomei, Fausto Ortica, D. D'Angelo, Michael Wurm, Andrew Sonnenschein, I. Machulin, A. Bevilacqua, E. Litvinovich, P. Musico, G. Di Pietro, G. Testera, K. McCarty, R. von Hentig, A. Cubauu, M. Orsini, Sandra Malvezzi, M. E. Monzani, J. Benziger, P. Saggese, J. Kiko, Q. Meindl, S. Parmeggiano, D. Rountree, J. Maneira, A. Di Credico, B. William, Daniel McKinsey, A. Manco, V. Muratova, B. Caccianiga, P.H. La Marche, R. Scardaoni, Aldo Romani, F. Calaprice, L. Papp, B. Freudiger, Ugo Mazzucato, F. Soricelli, D. Vignaud, G. Ceccet, L. Niedermeier, Michael K.H. Leung, A. Pocar, H. Neder, S. Hardy, M. Goeger-Neff, T. A. Shutt, R. Fernholz, G. Manuzio, K. H. Schubeck, Till Kirsten, I. Manno, Cristiano Galbiati, C. Sule, Mikael Hult, A. Nelson, D. Loeser, Danilo Giugni, R. Ceresto, Hardy Simgen, D. Schimizzi, D. Franco, F. Dalnoki-Veress, R. Eisenstein, S. Gazzana, A. Chen, K. Fomenko, V. Lagomarsino, A. de Bari, D. Kryne, C. Carraro, K. Jaenner, S. Vital, R. Tartaglia, E. Harding, D. Montanari, M. Skorokhvatov, G. Bellini, A. A. Sabelnikov, C. Arpesella, R. B. Vogelaar, R. Wordel, S. Schönert, Lino Miramonti, A. Golubchikov, S. Kidner, T. Lewke, C. Lendvai, Martin Deutsch, G. Heusser, A. Derbin, Marcin Wójcik, C. Grieb, Elisa Resconi, E. Meroni, Andrea Ianni, Sandra Zavatarelli, Gioacchino Ranucci, R. S. Raghavan, H.O. Back, Fausto Elisei, G. Korga, R. Saldhana, Y. Suvorov, L. Oberauer, A. Sotnikov, G. Korschnik, M. Gärtner, A. E. Chavarria, L. Perasso, S. V. Sukhotin, V. V. Kobychev, M. Obolensky, H. de Kerret, G. Zuzel, Y. Kozlov, Fausto Masetti, Paolo Lombardi, A.V. Etenko, A. Goretti, Livia Ludhova, W. Hampel, A. S. Chepurnov, M. Balata, F. Siccardi, C. Salvo, B. Loer, C. Hagner, W. Rau, O. Zaimidoroga, P. Risso, F. Gattig, V. G. Tarasenkov, F. Hartmann, Nicomede Pelliccia, A. Razeto, A. Di Ldovico, R. J. Ford, Marco Giammarchi, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Borexino, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Alimonti, G., Suvorov, Y., Et, Al., Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris
Subjects: Low background detector, Nuclear and High Energy Physics, Photomultiplier, Particle physics, Liquid scintillator, Physics - Instrumentation and Detectors, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Physics::Instrumentation and Detectors, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Solar neutrino, FOS: Physical sciences, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], High Energy Physics - Experiment (hep-ex), Low background detectors, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Borexino, Nuclear and High Energy Physic, Physics, ICARUS, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Instrumentation and Detectors (physics.ins-det), Liquid scintillators, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], High Energy Physics::Experiment, Neutrino, Large Volume Detector
Abstract: Borexino, a large volume detector for low energy neutrino spectroscopy, is currently running underground at the Laboratori Nazionali del Gran Sasso, Italy. The main goal of the experiment is the real-time measurement of sub MeV solar neutrinos, and particularly of the mono energetic (862 keV) Be7 electron capture neutrinos, via neutrino-electron scattering in an ultra-pure liquid scintillator. This paper is mostly devoted to the description of the detector structure, the photomultipliers, the electronics, and the trigger and calibration systems. The real performance of the detector, which always meets, and sometimes exceeds, design expectations, is also shown. Some important aspects of the Borexino project, i.e. the fluid handling plants, the purification techniques and the filling procedures, are not covered in this paper and are, or will be, published elsewhere (see Introduction and Bibliography)., Comment: 37 pages, 43 figures, to be submitted to NIM
Published: 2009
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25. First results on 7Be solar neutrinos from the Borexino real time detector

Author: G Bellini, J Benziger, S Bonetti, B Caccianiga, F Calaprice, F Dalnoki-Veress, D D'Angelo, H de Kerret, A Derbin, A Etenko, K Fomenko, R Ford, D Franco, C Galbiati, S Gazzana, M Giammarchi, M Goeger-Neff, A Goretti, C Grieb, S Hardy, G Heusser, A Ianni, M Joyce, G Korga, D Kryn, M Laubenstein, M Leung, E Litvinovich, P Lombardi, L Ludhova, I Machulin, G Manuzio, F Masetti, K McCarty, E Meroni, L Miramonti, M Misiaszek, D Montanari, M E Monzani, V Muratova, L Niedermeier, L Oberauer, M Obolensky, F Ortica, M Pallavicini, L Papp, L Perasso, A Pocar, R S Raghavan, G Ranucci, A Razeto, A Sabelnikov, C Salvo, S Schönert, H Simgen, O Smirnov, M Skorokhvatov, A Sonnenschein, A Sotnikov, S Sukhotin, Y Suvorov, V Tarasenkov, R Tartaglia, G Testera, D Vignaud, R B Vogelaar, F von Feilitzsch, M Wojcik, O Zaimidoroga, S Zavatarelli, G Zuzel, the Borexino Collaboration, APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Borexino, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)
Subjects: Physics, History, Particle physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Solar neutrino, Detector, Solar neutrino problem, 01 natural sciences, 7. Clean energy, Computer Science Applications, Education, Nuclear physics, Neutrino detector, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, 010306 general physics, Order of magnitude, Borexino
Abstract: International audience; The Borexino experiment started the data taking may 15th 2007. It is until now the only experiment able to detect in real time neutrino interactions below 2 MeV. This is due to the very high radio-purity reached by the detector, more than one order of magnitude better than the goal of the design. The detector allows the single fluxes of low energy solar neutrinos to be determined from all sources not previously studied: 7Be, pep, CNO and hopefully pp. Here the first measurement of the 7Be, obtained from the first 47.6 live days of data taking, is presented.
Published: 2008
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26. Measurements of extremely low radioactivity levels in BOREXINO

Author: C. Arpesella, H.O. Back, M. Balata, T. Beau, G. Bellini, J. Benziger, S. Bonetti, A. Brigatti, C. Buck, B. Caccianiga, L. Cadonati, F. Calaprice, G. Cecchet, M. Chen, O. Dadoun, D. D'Angelo, A. De Bari, A. de Bellefon, E. De Haas, H. de Kerret, A. Derbin, M. Deutsch, A. Di Credico, F. Elisei, A. Etenko, F. von Feilitzsch, R. Fernholz, R. Ford, D. Franco, B. Freudiger, C. Galbiati, F. Gatti, S. Gazzana, M.G. Giammarchi, D. Giugni, M. Göger-Neff, T. Goldbrunner, A. Golubchikov, A. Goretti, C. Grieb, C. Hagner, T. Hagner, W. Hampel, E. Harding, F.X. Hartmann, R. von Hentig, G. Heusser, M. Hult, A. Ianni, A.M. Ianni, J. Kiko, T. Kirsten, M. Köhler, G. Korga, G. Korschinek, Y. Kozlov, D. Kryn, P. LaMarche, M. Laubenstein, C. Lendvai, F. Loeser, P. Lombardi, K. McCarty, I. Machulin, S. Malvezzi, J. Maneira, I. Manno, G. Manuzio, A. Martemianov, F. Masetti, U. Mazzucato, E. Meroni, L. Miramonti, M.E. Monzani, P. Musico, H. Neder, L. Niedermeier, S. Nisi, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, L. Perasso, A. Pocar, R.S. Raghavan, G. Ranucci, W. Rau, A. Razeto, E. Resconi, T. Riedel, A. Sabelnikov, C. Salvo, R. Scardaoni, S. Schönert, K.H. Schuhbeck, T. Shutt, H. Simgen, A. Sonnenschein, O. Smirnov, A. Sotnikov, M. Skorokhvatov, S. Sukhotin, V. Tarasenkov, R. Tartaglia, G. Testera, P.R. Trincherini, V. Vyrodov, R.B. Vogelaar, D. Vignaud, S. Vitale, M. Wójcik, O. Zaimidoroga, and G. Zuzel
Subjects: Physics, Scintillation, Particle physics, Solar neutrino, radioactivity low level measurements, BOREXINO, Isotope, Physics::Instrumentation and Detectors, Settore FIS/01 - Fisica Sperimentale, FOS: Physical sciences, chemistry.chemical_element, Astronomy and Astrophysics, Germanium, Mass spectrometry, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, High Energy Physics - Experiment (hep-ex), chemistry, Atom, Borexino, Neutron activation
Abstract: The techniques researched, developed and applied towards the measurement of radioisotope concentrations at ultra-low levels in the real-time solar neutrino experiment BOREXINO at Gran Sasso are presented and illustrated with specific results of widespread interest. We report the use of low-level germanium gamma spectrometry, low-level miniaturized gas proportional counters and low background scintillation detectors developed in solar neutrino research. Each now sets records in its field. We additionally describe our techniques of radiochemical ultra-pure, few atom manipulations and extractions. Forefront measurements also result from the powerful combination of neutron activation and low-level counting. Finally, with our techniques and commercially available mass spectrometry and atomic absorption spectroscopy, new low-level detection limits for isotopes of interest are obtained., 27 pages, 5 figures. Submitted to Astroparticle Physics (17 Sep 2001). Spokesperson of the Borexino Collaboration: G. Bellini. Corresponding author: W. Hampel
Published: 2002

27. Kinetic Processes on Metal Single-Crystal Surfaces

Author: R. J. Madix and J. Benziger
Subjects: Surface (mathematics), Work (thermodynamics), Materials science, Adsorption, Chemical physics, Desorption, Molecule, Physical and Theoretical Chemistry, Heterogeneous catalysis, Electrocatalyst, Single crystal
Abstract: Chemical interactions between gas molecules and solid surfaces manifest themselves as crucial considerations in such diverse areas as wall effects in fusion reactors, heterogeneous catalysis (including electrocatalysis), corrosion, and molecular cos mology. In each of these fields the resolution of important questions rests on a more fundamental understanding of molecular transformations that occur at solid surfaces. Each process in question is characterizcd by thc sequence of molecular events (a) adsorption, (b) surface reaction, and (c) desorption (except when the reac tion product is nonvolatile). The purpose of this article is to review the recent work that utilizes single-crystal surfaces to understand these elementary processes, in cluding the effects of surface structure and composition. Excellent review articles are available concerning adsorption-desorption and surface reaction phenomena (82, 106, 108, 118, 141) and the interested reader should consult these for further information. In addition to these kinetic events, the current knowledge of the nature of the adsorbed state is also briefly reviewed. Surface oxidation processes which involve the surface as a final reaction product are not discussed.
Published: 1978
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28. The Monte Carlo simulation of the Borexino detector.

Author: S Marcocci, M Agostini, K Altenmüller, S Appel, V Atroshchenko, Z Bagdasarian, D Basilico, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, S Caprioli, M Carlini, P Cavalcante, A Chepurnov, and K Choi
Published: 2020
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29. Study of solar and geo-neutrinos with the Borexino detector

Author: J. Benziger, L. Grandi, M. Buizza Avanzini, R. Saldanha, L. Perasso, Q. Meindl, A. Goretti, G. Testera, P. Mosteiro, M. Goger-Neff, C. Salvo, S. Zavatarelli, Y. Koshio, R. Tartaglia, M. Wojcik, J. Xu, A. Razeto, S. Davini, S. Manecki, D. Korablev, S. Perasso, A. Chavarria, G. Korga, Gioacchino Ranucci, V. N. Muratova, E. Litvinovich, B. Caccianiga, R. S. Raghavan, S. Gazzana, R. B. Vogelaar, M. Pallavicini, D. Bick, F. von Feilitzsch, D. Dangelo, D. Montanari, G. Zuzel, A.V. Etenko, D. Vignaud, C. Carraro, W. Maneschg, L. Oberauer, Y. Suvorov, C. Galbiati, P. Cavalcante, S. Bonetti, D. Franco, E. Guardincerri, An. Ianni, A. A. Sabelnikov, F. Ortica, T. Lewke, S. Hardy, M. Obolensky, A. Sotnikov, A. Pocar, M. D. Skorokhvatov, O. Smirnov, I. N. Machulin, Laura Cadonati, G. Manuzio, S. Schonert, A. Wright, Lino Miramonti, L. Papp, M. Giammarchi, J. Winter, S. V. Sukhotin, K. Fomenko, A. Re, G. Bellini, V. V. Kobychev, P. Lombardi, M. Misiaszek, Al. Ianni, A. Romani, F. Calaprice, A. V. Derbin, B. Loer, D. Kryn, E. Meroni, M. Wurm, C. Ghiano, O. Zaimidoroga, and H. Simgen
Subjects: Nuclear physics, Physics, Neutrino detector, Solar neutrino, Detector, Measurements of neutrino speed, Astronomy, Neutrino, Solar neutrino problem, Neutrino oscillation, Borexino

30. CeSOX: An experimental test of the sterile neutrino hypothesis with Borexino.

Author: M Gromov, M Agostini, K Altenmüller, S Appel, V Atroshchenko, Z Bagdasarian, D Basilico, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, S Caprioli, M Carlini, P Cavalcante, A Chepurnov, and K Choi
Published: 2017
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31. A Search for Low-energy Neutrinos Correlated with Gravitational Wave Events GW 150914, GW 151226, and GW 170104 with the Borexino Detector.

Author: M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, S. Caprioli, M. Carlini, P. Cavalcante, A. Chepurnov, K. Choi, and D. D'angelo
Subjects: SOLAR neutrinos, GRAVITATIONAL waves, BETA decay, COSMOLOGICAL principle
Abstract: We present the results of a low-energy neutrino search using the Borexino detector in coincidence with the gravitational wave (GW) events GW 150914, GW 151226, and GW 170104. We searched for correlated neutrino events with visible energies greater than 250 keV within a time window of ±500 s centered around the GW detection time. A total of five candidates were found for all three GW events combined. This is consistent with the expected number of solar neutrino and background events. As a result, we have obtained the best current upper limits on all flavor neutrino () fluence associated with GW events, in the neutrino energy range 0.5–5.0 MeV. [ABSTRACT FROM AUTHOR]
Published: 2017
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32. Solar neutrino detectors as sterile neutrino hunters.

Author: Marco Pallavicini, Collaboration, Borexino-SOX, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, G. Bellini, J. Benziger, N. Berton, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, M. Carlini, P. Cavalcante, A. Chepurnov, K. Choi, and O. Cloué
Published: 2017
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33. Test of the electron stability with the Borexino detector.

Author: A Vishneva, M Agostini, K Altenmüller, S Appel, V. Atroshchenko, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, M Carlini, P Cavalcante, A Chepurnov, K Choi, D D’Angelo, S Davini, and K de Kerret
Published: 2017
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34. Improvements in the simulation code of the SOX experiment.

Author: A. Caminata, M. Agostini, K. Altenmüeller, S. Appel, V. Atroshchenko, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, M. Carlini, P. Cavalcante, A. Chepurnov, K. Choi, M. Cribier, D. D’Angelo, S. Davini, and A. Derbin
Published: 2017
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35. Recent Results from Borexino.

Author: D Jeschke, M Agostini, K Altenmüller, S Appel, V Atroshchenko, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, M Carlini, P Cavalcante, A Chepurnov, K Choi, D D’Angelo, S Davini, and A Derbin
Published: 2017
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36. High significance measurement of the terrestrial neutrino flux with the Borexino detector.

Author: A Ianni, M Agostini, K Altenmüller, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D’Angelo, S Davini, A Derbin, L Di Noto, I Drachnev, and A Etenko
Published: 2016
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37. SOX: search for short baseline neutrino oscillations with Borexino.

Author: M Vivier, M Agostini, K Altenmüller, S Appel, G Bellini, J Benziger, N Berton, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, K Choi, M Cribier, D D’Angelo, S Davini, and A Derbin
Published: 2016
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38. The 144Ce source for SOX.

Author: M Durero, M Vivier, M Agostini, K Altenmüller, S Appel, G Bellini, J Benziger, N Berton, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, K Choi, M Cribier, D D'Angelo, and S Davini
Published: 2016
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39. Understanding the detector behavior through Montecarlo and calibration studies in view of the SOX measurement.

Author: A Caminata, M Agostini, K Altenmüller, S Appel, G Bellini, J Benziger, N Berton, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, P Cavalcante, A Chepurnov, K Choi, M Cribier, D D'Angelo, S Davini, A Derbin, and L Di Noto
Published: 2016
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40. The high precision measurement of the 144Ce activity in the SOX experiment.

Author: L Di Noto, M Agostini, K Althenmüller, S Appel, G Bellini, J Benziger, N Berton, D Bick, G Bonfini, D Bravo—Berguño, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, R Cereseto, A Chepurnov, K Choi, M Cribier, D DAngelo, and S Davini
Published: 2016
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41. Measurement of Solar pp-neutrino flux with Borexino: results and implications.

Author: O Yu Smirnov, M Agostini, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D'Angelo, S Davini, A Derbin, L Di Noto, I Drachnev, A Etenko, and K Fomenko
Published: 2016
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42. CNO and pep solar neutrino measurements and perspectives in Borexino.

Author: S Davini, M Agostini, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D'Angelo, A Derbin, L Di Noto, I Drachnev, A Etenko, K Fomenko, and D Franco
Published: 2016
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43. Test of the electric charge conservation law with Borexino detector.

Author: A Vishneva, M Agostini, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D’ Angelo, S Davini, A Derbin, L Di Noto, I Drachnev, A Etenko, and K Fomenko
Published: 2016
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44. Geo-neutrino results with Borexino.

Author: R Roncin, M Agostini, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D'Angelo, S Davini, A Derbin, L Di Noto, I Drachnev, A Etenko, and K Fomenko
Published: 2016
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45. Overview and accomplishments of the Borexino experiment.

Author: G Ranucci, M Agostini, S Appel, G Bellini, J Benziger, D Bick, G Bonfini, D Bravo, B Caccianiga, F Calaprice, A Caminata, P Cavalcante, A Chepurnov, D D'Angelo, S Davini, A Derbin, L Di Noto, I Drachnev, A Etenko, and K Fomenko
Published: 2016
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46. Discovery of underground argon with low level of radioactive 39Ar and possible applications to WIMP dark matter detectors

Author: D. Marks, M. Roncadelli, K. McCarty, L. Basgall, C. Vignoli, Alfredo G. Cocco, L. Grandi, A. P. Burgers, D. Cheng, F. Di Pompeo, G. Meng, Alexey Yushkov, M. Antonello, N. Canci, F. Fitch, F. Resnati, T. Hohman, Brendan Lyons, F. Carbonara, Matthias Laubenstein, Richard Vondrasek, R. Saldanha, R. Acciarri, C. J. Ballentine, Daniel Robertson, Tiberiu Tesileanu, A. Shirley, J. Ruderman, S. Gazzana, A. Rappoldi, Frank Calaprice, R Highfill, R. Bansal, M. Cambiaghi, C. Rubbia, A. LaCava, A. Pocar, F. Pietropaolo, E. Calligarich, D. Acosta-Kane, Sandro Ventura, A. O. Bazarko, Michael K.H. Leung, G. Fiorillo, A. M. Szelc, P. Benetti, T. Pivonka, F. Cavanna, Luciano Pandola, C. Schmitt, Jay Burton Benziger, R. Tartaglia, Roland Purtschert, O Amaize, M. Gaull, S. Centro, Al. Ianni, F. Dalnoki-Veress, M. Baldo Ceolin, E. de Haas, B. Loer, An. Ianni, Philippe Collon, H.H. Loosli, Robert G. Scott, A. E. Chavarria, Massimo Rossella, A. M. Goretti, V. Gallo, C. Montanari, Cristiano Galbiati, M. Cassidy, B. Baibussinov, T Highfill, O. Palamara, Hye Young Lee, E. Segreto, C. Visnjic, G.L. Raselli, Sujoy Mukhopadhyay, A. Nelson, C., Galbiati, D., Acosta Kane, R., Acciarri, O., Amaize, M., Antonello, B., Baibussinov, M. B., Ceolin, C. J., Ballentine, R., Bansal, L., Basgall, A., Bazarko, P., Benetti, J., Benziger, A., Burger, F., Calaprice, E., Calligarich, M., Cambiaghi, N., Canci, F., Carbonara, M., Cassidy, F., Cavanna, S., Centro, A., Chavarria, D., Cheng, A. G., Cocco, P., Collon, F., Dalnoki Vere, E. d., Haasi, F. D., Pompeo, Fiorillo, Giuliana, F., Fitch, V., Gallo, M., Gaull, S., Gazzana, L., Grandi, A., Gorettil, R., Highfill, T., Highfill, T., Hohman, A., Ianni, A., Lacava, M., Laubenstein, H. Y., Lee, M., Leung, B., Loer, H. H., Loosli, B., Lyon, D., Mark, K., Mccarty, G., Meng, C., Montanari, S., Mukhopadhyay, A., Nelson, O., Palamara, L., Pandola, F., Pietropaolo, T., Pivonka, A., Pocar, R., Purtschert, A., Rappoldi, G., Raselli, F., Resnati, D., Robertson, M., Roncadelli, M., Rossella, C., Rubbia, J., Ruderman, R., Saldanha, C., Schmitt, R., Scott, E., Segreto, A., Shirley, A. M., Szelc, R., Tartaglia, T., Tesileanu, S., Ventura, C., Vignoli, C., Visnjic, R., Vondrasek, A., Yushkov, E. d., Haa, and A., Goretti
Subjects: History, Nuclear and High Energy Physics, ADSORPTION, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, chemistry.chemical_element, Astrophysics, WIMP Argon Programme, 01 natural sciences, Education, Nuclear physics, WIMP, Natural gas, LIQUID ARGON, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Chemical Physics, 010306 general physics, Instrumentation, Helium, Physics, Argon, 010308 nuclear & particles physics, business.industry, Astrophysics (astro-ph), Detector, Isotopes of argon, Computer Science Applications, NITROGEN, chemistry, 13. Climate action, business
Abstract: We report on the first measurement of 39Ar in argon from underground natural gas reservoirs. The gas stored in the US National Helium Reserve was found to contain a low level of 39Ar. The ratio of 39Ar to stable argon was found to be, 6 pages, 2 figures, 2 tables
Published: 2008
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47. DarkSide search for dark matter

Author: I. N. Machulin, R. Klemmer, Marco Pallavicini, N. Rossi, G. Forster, K. Fomenko, W. Sands, G. Di Pietro, H. Cao, D. D'Angelo, M. Komor, A. Razeto, N. N. Nurakhov, R. Saldanha, S. Parmeggiano, A. Nemtzow, E. Shields, F. Perfetto, Min-Xin Guan, M. Gromov, K. Randle, E. V. Unzhakov, S. Bussino, M. Orsini, M. Montuschi, E. Meroni, G. Korga, Austin P. Lund, Marc S. Seigar, A. Tonazzo, E. de Haas, G. Testera, L. Lukyanchenko, S. Gazzana, M. D. Skorokhvatov, B. Rossi, M. De Vincenzi, J. Maricic, L. Grandi, G. Zuzel, Laura Cadonati, M. E. Monzani, Yanhui Ma, D. Durben, M. Zehfus, B. J. Mount, Chung-Yao Yang, Augusto Brigatti, Lawrence Pinsky, A. Kayunov, R. B. Vogelaar, A. Meregaglia, S. Chidzik, C. Joliet, C. Condon, C. Ghiano, A. Pocar, N. Pelliccia, C. L. Kendziora, P. Saggese, A. Nelson, Sandra Zavatarelli, P. X. Li, O. Smirnov, S. Westerdale, Livia Ludhova, A. M. Goretti, A. S. Chepurnov, Thomas Alexander, S. Pordes, E. V. Hungerford, G. Koh, G. Guray, A. Sotnikov, Fausto Ortica, C. Guo, D. A. Semenov, R. Tartaglia, E. Pantic, K. Arisaka, G. Fiorillo, D. Korablev, I. Dratchnev, C. J. Martoff, Frank Calaprice, J. Brodsky, J. Tatarowicz, K. Keeter, Gioacchino Ranucci, Marcin Wójcik, D. Franco, W. Zhong, P. Cavalcante, Henning O. Back, G. Bonfini, P. Beltrame, P. D. Meyers, J. Thompson, An. Ianni, V. N. Muratova, L. Perasso, D. Alton, C. Salvo, S. Perasso, A.V. Etenko, R. Parsells, S. Davini, A. G. Cocco, Al. Ianni, Stefano Maria Mari, S. Luitz, Han Wang, P. J. Mosteiro, F. Gabriele, Jingke Xu, Cristiano Galbiati, D. Montanari, A. Fan, A. Empl, S. Kidner, S. V. Sukhotin, A. Wright, V. V. Kobychev, K. Lung, C. Love, T. Mohayai, A. Candela, S. D. Rountree, Paolo Lombardi, Aldo Romani, B Loer, A. V. Derbin, Y Suvarov, Jay Burton Benziger, T., Alexander, D., Alton, K., Arisaka, H. O., Back, P., Beltrame, J., Benziger, G., Bonfini, A., Brigatti, J., Brodsky, S., Bussino, L., Cadonati, F., Calaprice, A., Candela, H., Cao, P., Cavalcante, A., Chepurnov, S., Chidzik, A. G., Cocco, C., Condon, D., D'Angelo, S., Davini, M. D., Vincenzi, E. D., Haa, A., Derbin, G. D., Pietro, I., Dratchnev, D., Durben, A., Empl, A., Etenko, A., Fan, Fiorillo, Giuliana, D., Franco, K., Fomenko, G., Forster, F., Gabriele, C., Galbiati, S., Gazzana, C., Ghiano, A., Goretti, L., Grandi, M., Gromov, M., Guan, C., Guo, G., Guray, E. V., Hungerford, A., Ianni, C., Joliet, A., Kayunov, K., Keeter, C., Kendziora, S., Kidner, R., Klemmer, V., Kobychev, G., Koh, M., Komor, D., Korablev, G., Korga, P., Li, B., Loer, P., Lombardi, C., Love, L., Ludhova, S., Luitz, L., Lukyanchenko, A., Lund, K., Lung, Y., Ma, I., Machulin, S., Mari, J., Maricic, C. J., Martoff, A., Meregaglia, E., Meroni, P., Meyer, T., Mohayai, D., Montanari, M., Montuschi, M. E., Monzani, P., Mosteiro, B., Mount, V., Muratova, A., Nelson, A., Nemtzow, N., Nurakhov, M., Orsini, F., Ortica, M., Pallavicini, E., Pantic, S., Parmeggiano, R., Parsell, N., Pelliccia, L., Perasso, S., Perasso, Perfetto, Francesco, L., Pinsky, A., Pocar, S., Porde, K., Randle, G., Ranucci, A., Razeto, A., Romani, B., Rossi, N., Rossi, S. D., Rountree, P., Saggese, R., Saldanha, C., Salvo, W., Sand, M., Seigar, D., Semenov, E., Shield, M., Skorokhvatov, O., Smirnov, A., Sotnikov, S., Sukhotin, Y., Suvarov, R., Tartaglia, J., Tatarowicz, G., Testera, J., Thompson, A., Tonazzo, E., Unzhakov, R. B., Vogelaar, H., Wang, S., Westerdale, M., Wojcik, A., Wright, J., Xu, C., Yang, S., Zavatarelli, M., Zehfu, W., Zhong, G., Zuzel, Physics Department, Amherst U., University of Massachusetts System (UMASS), Biomécanique et Bioingénierie (BMBI), Université de Technologie de Compiègne (UTC)-Centre National de la Recherche Scientifique (CNRS), Régulation de l'expression génétique chez les microorganismes (REGCM), Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), departement de physique, Albert-Ludwigs-Universität Freiburg, SLAC National Accelerator Laboratory (SLAC), Stanford University, Anhui University [Hefei], Physics Department, Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Department of Geological Sciences, University of Michigan [Ann Arbor], University of Michigan System-University of Michigan System, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), Università degli studi di Genova = University of Genoa (UniGe), Departamento de Engenharia Elétrica [Minas Gerais] (DEE - UFMG), Universidade Federal de Minas Gerais, Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, Rhodes University, Grahamstown, EAST CHINA UNIVERSITY, KEY LAB, Institute of Physics, Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences (PAN), International Iberian Nanotechnology Laboratory (INL), Centre de Recherche en Information Biomédicale sino-français (CRIBS), Université de Rennes (UR)-Southeast University [Jiangsu]-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut Européen des membranes (IEM), Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Alexander, T, Alton, D, Arisaka, K, Back, Ho, Beltrame, P, Benziger, J, Bonfini, G, Brigatti, A, Brodsky, J, Bussino, Severino Angelo Maria, Cadonati, L, Calaprice, F, Candela, A, Cao, H, Cavalcante, P, Chepurnov, A, Chidzik, S, Cocco, Ag, Condon, C, D'Angelo, D, Davini, S, DE VINCENZI, Mario, De Haas, E, Derbin, A, Di Pietro, G, Dratchnev, I, Durben, D, Empl, A, Etenko, A, Fan, A, Fiorillo, G, Franco, D, Fomenko, K, Forster, G, Gabriele, F, Galbiati, C, Gazzana, S, Ghiano, C, Goretti, A, Grandi, L, Gromov, M, Guan, M, Guo, C, Guray, G, Hungerford, Ev, Ianni, Al, Ianni, An, Joliet, C, Kayunov, A, Keeter, K, Kendziora, C, Kidner, S, Klemmer, R, Kobychev, V, Koh, G, Komor, M, Korablev, D, Korga, G, Li, P, Loer, B, Lombardi, P, Love, C, Ludhova, L, Luitz, S, Lukyanchenko, L, Lund, A, Lung, K, Ma, Y, Machulin, I, Mari, Stefano Maria, Maricic, J, Martoff, Cj, Meregaglia, A, Meroni, E, Meyers, P, Mohayai, T, Montanari, D, Montuschi, M, Monzani, Me, Mosteiro, P, Mount, B, Muratova, V, Nelson, A, Nemtzow, A, Nurakhov, N, Orsini, M, Ortica, F, Pallavicini, M, Pantic, E, Parmeggiano, S, Parsells, R, Pelliccia, N, Perasso, L, Perasso, S, Perfetto, F, Pinsky, L, Pocar, A, Pordes, S, Randle, K, Ranucci, G, Razeto, A, Romani, A, Rossi, B, Rossi, N, Rountree, Sd, Saggese, P, Saldanha, R, Salvo, C, Sands, W, Seigar, M, Semenov, D, Shields, E, Skorokhvatov, M, Smirnov, O, Sotnikov, A, Sukhotin, S, Suvarov, Y, Tartaglia, R, Tatarowicz, J, Testera, G, Thompson, J, Tonazzo, A, Unzhakov, E, Vogelaar, Rb, Wang, H, Westerdale, S, Wojcik, M, Wright, A, Xu, J, Yang, C, Zavatarelli, S, Zehfus, M, Zhong, W, Zuzel, G., Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Dip. di Fisica dell'Università di Genova - Italy, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Southeast University [Jiangsu]-Institut National de la Santé et de la Recherche Médicale (INSERM), and Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)
Subjects: Physics::Instrumentation and Detectors, Dark matter, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, Dark Matter detector, 010306 general physics, Instrumentation, Mathematical Physics, ComputingMilieux_MISCELLANEOUS, Event reconstruction, Physics, [PHYS]Physics [physics], Scintillation, Argon, Time projection chamber, 010308 nuclear & particles physics, Detector, chemistry, Scintillation counter, High Energy Physics::Experiment, Noble liquid detector, DarkSide detector, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: "The DarkSide staged program utilizes a two-phase time projection chamber (TPC) with liquid argon as the target material for the scattering of dark matter particles. Efficient background reduction is achieved using low radioactivity underground argon as well as several experimental handles such as pulse shape, ratio of ionization over scintillation signal, 3D event reconstruction, and active neutron and muon vetos. The DarkSide-10 prototype detector has proven high scintillation light yield, which is a particularly important parameter as it sets the energy threshold for the pulse shape discrimination technique. The DarkSide-50 detector system, currently in commissioning phase at the Gran Sasso Underground Laboratory, will reach a sensitivity to dark matter spin-independent scattering cross section of 10(-45) cm(2) within 3 years of operation."
Published: 2013
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48. Lifetimes of (214)Po and (212)Po measured with Counting Test Facility at Gran Sasso National Laboratory.

Author: Miramonti L, Bellini G, Benziger J, Bick D, Bonfini G, Bravo D, Buizza Avanzini M, Caccianiga B, Cadonati L, Calaprice F, Carraro C, Cavalcante P, Chavarria A, Chubakov V, D'Angelo D, Davini S, Derbin A, Etenko A, Fomenko K, Franco D, Galbiati C, Gazzana S, Ghiano C, Giammarchi M, Göger-Neff M, Goretti A, Grandi L, Guardincerri E, Hardy S, Ianni A, Ianni A, Kobychev V, Korablev D, Korga G, Koshio Y, Kryn D, Laubenstein M, Lewke T, Lissia M, Litvinovich E, Loer B, Lombardi F, Lombardi P, Ludhova L, Machulin I, Manecki S, Maneschg W, Mantovani F, Manuzio G, Meindl Q, Meroni E, Misiaszek M, Montanari D, Mosteiro P, Muratova V, Nisi S, 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, Sabelnikov A, Saldanha R, Salvo C, Schönert S, Simgen H, Skorokhvatov M, Smirnov O, Sotnikov A, Sukhotin S, Suvorov Y, Tartaglia R, Testera G, Vignaud D, Vogelaar RB, von Feilitzsch F, Winter J, Wojcik M, Wright A, Wurm M, Xhixha G, Xu J, Zaimidoroga O, Zavatarelli S, and Zuzel G
Subjects: Alpha Particles, Half-Life, Laboratories, Radiation Monitoring, Lead Radioisotopes analysis, Polonium analysis, Radioactive Pollutants analysis
Abstract: The decays of (214)Po into (210)Pb and of (212)Po into (208)Pb tagged by the previous decays from (214)Bi and (212)Bi have been studied inserting quartz vials inside the Counting Test Facility (CTF) at the underground laboratory in Gran Sasso (LNGS). We find that the mean lifetime of (214)Po is (236.00 ± 0.42(stat) ± 0.15(syst)) μs and that of (212)Po is (425.1 ± 0.9(stat) ± 1.2(syst)) ns. Our results are compatible with previous measurements, have a much better signal to background ratio, and reduce the overall uncertainties., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
Published: 2014
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49. Effect of interfacial water transport resistance on coupled proton and water transport across Nafion.

Author: Cheah MJ, Kevrekidis IG, and Benziger J
Abstract: Dynamic and steady-state water flux, current density, and resistance across a Nafion 115 membrane-electrode-assembly (MEA) were measured as functions of temperature, water activity, and applied potential. After step changes in applied potential, the current, MEA resistance, and water flux evolved to new values over 3000-5000 s, indicating a slow redistribution of water in the membrane. Steady-state current density initially increased linearly with increasing potential and then saturated at higher applied potentials. Water flux increases in the direction of current flow resulting from electro-osmotic drag. The coupled transport of water and protons was modeled with an explicit accounting for electro-osmotic drag, water diffusion, and interfacial water transport resistance across the vapor/membrane interface. The model shows that water is dragged inside the membrane by the proton current, but the net water flux into and out of the membrane is controlled by interfacial water transport at the membrane/vapor interface. The coupling of electro-osmotic drag and interfacial water transport redistributes the water in the membrane. Because water entering the membrane is limited by interfacial transport, an increase in current depletes water from the anode side of the membrane, increasing the membrane resistance there, which in turn limits the current. This feedback loop between current density and membrane resistance determines the stable steady-state operation at a fixed applied potential that results in current saturation. We show that interfacial water transport resistance substantially reduces the impact of electro-osmotic drag on polymer electrolyte membrane fuel cell operation., (© 2011 American Chemical Society)
Published: 2011
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50. Diffusion and interfacial transport of water in Nafion.

Author: Zhao Q, Majsztrik P, and Benziger J
Abstract: Water absorption, membrane swelling, and self-diffusivity of water in 1100 equivalent weight Nafion were measured as functions of temperature and water activity. Free volume per water at 80 °C, determined from water uptake and volume expansion data, decreases with water content in the membrane from 12 cm(3)/mol at λ = 0.5 H(2)O/SO(3) to 1.5 cm(3)/mol at λ = 4. The change in free volume with water content displays a transition at λ = 4. Limiting water self-diffusivity in Nafion was determined by pulsed gradient spin echo NMR at long delay times. The limiting self-diffusivity increases exponentially with water activity; the rate of increase of diffusivity with water content shows a transition at λ = 4. The tortuosity of the hydrophilic domains in Nafion decreased from 20 at low membrane water activity to 3 at λ = 4. It suggested a change in the connectivity of the hydrophilic domains absorbed water occurs at λ ∼ 4. The diffusivity results were employed to separate the contributions of diffusional and interfacial resistance for water transport across Nafion membranes, which enabled the determination of the interfacial mass transport coefficients. A diffusion model was developed which incorporated activity-dependent diffusivity, volume expansion, and the interfacial resistance, and was used to resolve the water activity profiles in the membrane.
Published: 2011
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