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27 results on '"V Di Marcello"'

1. Funzioni iperboliche e circolari.

Author

V Di Marcello, Franco Eugeni, and Giovanni Mataloni

Subjects
Mathematics, QA1-939, Probabilities. Mathematical statistics, QA273-280
Abstract

Nella presente nota si introduce la nozione di arco associato ad un settore iperbolico e si studiano le relazioni tra funzioni circolari ed iperboliche di argomenti associati.

Published
1996

2. 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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3. Study of antineutrinos from the Earth and the Cosmos with the Borexino detector

Author

Sandra Zavatarelli, M. Agostini, K. Altenmuller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, R. Biondi, D. Bravo, B. Caccianiga, A. Caminata, F. Calaprice, 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. Gottel, 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, 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. Schonert, 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

Published
2023
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4. Numerical analysis of radon behavior in radon-suppressed clean room environments

Author

V. Di Marcello, A. Ianni, and G. Panella

Subjects
Instrumentation, Mathematical Physics
Abstract

Radon-free clean rooms are essential for the production and assembly of components adopted in low-background experiments. In particular, long-lived radon decay products are often problematic for rare events searches, such as low energy neutrino interactions, direct dark matter detection, and neutrinoless double beta decay. These isotopes can easily deposit onto surfaces exposed to radon, leading to a residual background that can limit the sensitivity of experiments. In order to mitigate this background source, construction of detectors in radon-reduced environments is essential. In this framework, design and building of radon-suppressed clean rooms require a deep understanding of the radon behavior and the different sources of contamination. In the paper, computation fluid-dynamics (CFD) analyses of the radon-suppressed clean rooms built for the DarkSide-50 experiment are reported. The numerical model including the main radon contributions, such as structural materials, equipment, and operators activity, provides very promising results in a remarkable agreement with available experimental data, confirming the validity of the current modelling approach for future applications.

Published
2022
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6. 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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7. 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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8. 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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9. Fluid-dynamics and transport of 210Po in the scintillator Borexino detector: A numerical analysis

Author

V. Di Marcello, Andrea Ianni, N. Rossi, A. Di Giacinto, Frank Calaprice, D. Bravo-Berguño, Riccardo Mereu, Aldo Ianni, A. Di Ludovico, and L. Pietrofaccia

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Solar neutrino, Computational fluid dynamics, 01 natural sciences, Neutrino detector, 0103 physical sciences, Thermal, 010306 general physics, Instrumentation, Borexino, Physics, Natural convection, 010308 nuclear & particles physics, business.industry, Detector, Po Background, Computational Fluid Dynamics, Transport analysis, Computational physics, Neutrino, business
Abstract

Moving beyond the important contributions to neutrino physics obtained by the Borexino experiment during the last years, research activities are ongoing at INFN Gran Sasso National Laboratories to further improve the detector sensitivity in order to perform an accurate measurement of the subdominant CNO solar neutrino rate. To this purpose, the improvement of the detector fluid-dynamic stability is the key to further reduce the 210Po background, that is continuously being transported inside the measurement fiducial volume by convective currents. In this framework, numerical simulations of the detector fluid-dynamics may help to better comprehend the 210Po behaviour, and also to suggest effective countermeasures, able to minimize the natural convection inside the detector. In the present work, two-dimensional numerical simulations have been performed to improve the current understanding of Borexino thermal and fluid-dynamics. Adopted models have been optimized for different regions and periods of interest, focusing on the most critical aspects that were identified as influencing the polonium background concentrations. In particular, a Borexino-specific benchmark was constructed in order to validate the model temperature predictions. The derived inner vessel surface temperatures are successively used as boundary conditions for a more refined convective model of the inner most part of the detector. Based on the calculated convective currents, the transport behaviour of background 210Po inside the detector active volume was investigated by means of a convection–diffusion model, showing a reasonable good agreement between calculations and experimental data.

Published
2020

10. 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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11. The study of solar neutrinos and of non-standard neutrino interactions with Borexino

Author

S. Rottenanger, Luigi Cappelli, S. Schönert, Andrea Ianni, D. Bick, Sandra Zavatarelli, M. Gschwender, Matthias Laubenstein, V. Di Marcello, O. Zaimidoroga, J. Martyn, E. Litvinovich, N. Rossi, L. Lukyanchenko, G. Raikov, Z. Bagdasarian, K. Choi, M. Gromov, A. Jany, N. Pilipenko, B. Neumair, A. Vishneva, V. V. Kobychev, Xuefeng Ding, G. Korga, M. D. Skorokhvatov, Kai Zuber, Ö. Penek, A. M. Goretti, L. Papp, E. Meroni, E. V. Hungerford, D. Basilico, Michael Wurm, G. Bellini, S. Zavatarelli, J. Thurn, M. T. Ranalli, S. Marcocci, S. Kumaran, Fausto Ortica, A. Sotnikov, Tobias Lachenmaier, A. V. Derbin, L. Pietrofaccia, A. Razeto, D. Guffanti, V. Atroshchenko, Marco Giammarchi, D. Franco, G. Bonfini, G. Testera, D. Jeschke, Frank Calaprice, I. Lomskaya, Andrey Formozov, K. Altenmüller, I. S. Drachnev, D. Bravo, F. von Feilitzsch, M. Redchuk, Lothar Oberauer, S. Davini, R. Tartaglia, M. S. Meyer, V. N. Muratova, V. Orekhov, M. M. Wojcik, Matteo Agostini, Aldo Romani, L. Di Noto, M. Nieslony, A. Pocar, Jay Burton Benziger, Lino Miramonti, D. A. Semenov, F. Cavanna, Paolo Lombardi, O. Smirnov, A. Caminata, G. Zuzel, Marco Pallavicini, F. Gabriele, Y. Suvorov, E. V. Unzhakov, A. Di Ludovico, G. Lukyanchenko, Gioacchino Ranucci, G. Manuzio, J. Maricic, Alessandra Re, S. Appel, R. B. Vogelaar, Aldo Ianni, C. Galbiati, Livia Ludhova, A. S. Chepurnov, B. Caccianiga, C. Ghiano, Caren Hagner, I. N. Machulin, A. Di Giacinto, P. Cavalcante, M. Misiaszek, and D. D'Angelo

Subjects
Physics, History, Particle physics, Range (particle radiation), Physics::Instrumentation and Detectors, Oscillation, business.industry, Solar neutrino, High Energy Physics::Phenomenology, Scintillator, Solar energy, Computer Science Applications, Education, Observatory, High Energy Physics::Experiment, ddc:530, Neutrino, business, Borexino
Abstract

The Borexino liquid scintillator neutrino observatory has a unique capability to perform high-precision solar neutrino observations thanks to its exceptional radiopurity and good energy resolution (5% at 1 MeV). A comprehensive study of the pp-chain neutrinos was presented that includes the direct measurements of 7Be, pp and pep neutrino fluxes with the highest precision ever achieved (down to 2.8% in the 7Be component), the 8B with the lowest energy threshold, the best limit on CNO neutrinos and the first Borexino limit on hep neutrinos. These results are important to validate the MSW-LMA oscillation paradigm across the full solar energy range and to exclude possible Non-Standard neutrino Interactions (NSIs). In particular the effects of neutrino-flavor-diagonal Neutral-Current (NC) interactions that modify the vee and vτe couplings while preserving their chiral and flavor structures, have been investigated. At detection, the shape of the electron-recoil spectrum is affected by changes in the vee and vτe couplings, quantified by the parameters ε e L / R and ε τ L / R . New bounds to all four parameters were obtained, quite stringent compared to the global ones. In particular, the best constraint to-date on ε e L was achieved. A comprehensive summary of all the recent results on solar neutrinos from Borexino is reported in the present paper.

Published
2020
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12. 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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13. Analysis strategies for the updated geoneutrino measurement with Borexino

Author

S. Davini, Y. Suvorov, Matteo Agostini, S. Schöinert, Aldo Ianni, V. Di Marcello, O. Zaimidoroga, G. Raikov, Z. Bagdasarian, D. Bravo, Giovanni Fiorentini, C. Galbiati, S. Rottenanger, O. Smirnov, Livia Ludhova, V. V. Kobychev, I. S. Drachnev, N. Pilipenko, A. S. Chepurnov, V. N. Muratova, E. V. Unzhakov, M. Vivier, Lino Miramonti, Luigi Cappelli, D. Franco, D. Basilico, A. Jany, A. M. Goretti, Virginia Strati, Ö. Penek, F. Cavanna, A. Razeto, A. Onillon, S. Kumaran, M. T. Ranalli, J. Thurn, G. Lukyanchenko, I. N. Machulin, Michele Montuschi, K. Choi, E. V. Hungerford, M. Gromov, Andrea Ianni, D. Bick, Sandra Zavatarelli, Tobias Lachenmaier, Marco Giammarchi, M. S. Meyer, D. A. Semenov, G. Testera, A. Sotnikov, D. D'Angelo, G. Bonfini, M. M. Wojcik, J. Martyn, Aldo Romani, L. Di Noto, Alessandra Re, Frank Calaprice, Paolo Lombardi, E. Litvinovich, A. V. Derbin, Jay Burton Benziger, M. Redchuk, N. Rossi, J. Maricic, S. Appel, Kai Zuber, D. Jeschke, A. Pocar, R. B. Vogelaar, Xuefeng Ding, Gioacchino Ranucci, L. Pietrofaccia, G. Zuzel, I. Lomskaya, B. Caccianiga, Andrey Formozov, F. von Feilitzsch, Fabio Mantovani, V. Orekhov, B. Neumair, G. Korga, L. Papp, Fausto Ortica, D. Guffanti, A. Di Ludovico, G. Manuzio, K. Altenmüller, L. Lukyanchenko, A. Vishneva, G. Bellini, M. Nieslony, A. Caminata, Marco Pallavicini, F. Gabriele, Barbara Ricci, M. Gschwender, S. Marcocci, R. Tartaglia, V. Atroshchenko, M. D. Skorokhvatov, Michael Wurm, Lothar Oberauer, Matthias Laubenstein, T. Lasserre, E. Meroni, C. Ghiano, Caren Hagner, A. Di Giacinto, P. Cavalcante, and M. Misiaszek

Subjects
History, Particle physics, data analysis method, Analysis strategies, Analysis techniques, Cosmogenic, Geo-neutrinos, Liquid scintillator detectors, Low background, Purified water, Time windows, Geoneutrino, water, Education, NO, low [background], Borexino, liquid [scintillation counter], shielding, Computer Science Applications, Gran Sasso, geophysics [neutrino], statistics, Environmental science, Toyama 2019/09/09 [talk], 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 have made Borexino an excellent apparatus for geoneutrino measurements. The analysis techniques of the latest geoneutrino results with Borexino were presented using the data obtained from December 2007 to April 2019, corresponding to an exposure of (1.12 ± 0.05) × 1032 protons × yr. Enhanced analysis techniques, such as an increased fiducial volume, improved veto for cosmogenic backgrounds, extended energy and coincidence time windows, as well as a more efficient α/β particle discrimination have been adopted in this measurement. The updated statistics and these elaborate resulted in a geoneutrino signal of 47.0 − 7.7 + 8.4 ( stat ) − 1.9 + 2.4 ( sys ) TNU with − 17.2 + 18.3 % total precision.

Published
2020
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14. Search for low-energy neutrinos from astrophysical sources with Borexino

Author

V. Atroshchenko, Alessandra Re, R. Tartaglia, D. Jeschke, E. V. Hungerford, Lothar Oberauer, Ö. Penek, J. Thurn, G. Bonfini, Frank Calaprice, Matteo Agostini, M. T. Ranalli, A. Sotnikov, Matthias Laubenstein, S. Appel, G. Lukyanchenko, G. Testera, S. Marcocci, Andrey Formozov, S. Kumaran, L. Lukyanchenko, K. Choi, Y. Suvorov, Livia Ludhova, A. M. Goretti, A. S. Chepurnov, An. Ianni, F. Cavanna, B. Caccianiga, G. Zuzel, F. von Feilitzsch, M. Gromov, R. B. Vogelaar, E. Meroni, I. N. Machulin, Cristiano Galbiati, D. A. Semenov, A. V. Derbin, V. Orekhov, G. Bellini, D. D'Angelo, L. Papp, M. Redchuk, A. Jany, I. Lomskaya, V. Di Marcello, O. Zaimidoroga, N. Rossi, I. S. Drachnev, Tobias Lachenmaier, J. Martyn, Marco Giammarchi, E. Litvinovich, V. N. Muratova, V. V. Kobychev, M. Gschwender, Fausto Ortica, A. Vishneva, M. D. Skorokhvatov, Michael Wurm, D. Guffanti, J. Maricic, Xuefeng Ding, Lino Miramonti, D. Basilico, A. Di Ludovico, C. Ghiano, Kai Zuber, Caren Hagner, G. Korga, G. Manuzio, B. Neumair, M. Meyer, L. Pietrofaccia, D. Bick, Sandra Zavatarelli, A. Di Giacinto, N. Pilipenko, A. Razeto, P. Cavalcante, D. Bravo, D. Franco, M. Misiaszek, Paolo Lombardi, Gioacchino Ranucci, A. Pocar, S. Rottenanger, S. Davini, O. Smirnov, S. Schönert, E. V. Unzhakov, Marcin Wójcik, K. Altenmüller, M. Nieslony, A. Caminata, Marco Pallavicini, F. Gabriele, Barbara Ricci, G. Raikov, Z. Bagdasarian, L. Cappelli, Jay Burton Benziger, Aldo Romani, L. Di Noto, AstroParticule et Cosmologie (APC (UMR_7164)), 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), Borexino, 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), 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, 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, Lomskaya, I, 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, Ranalli, M, Ranucci, G, Razeto, A, Re, A, Redchuk, M, Ricci, B, Romani, A, Rossi, N, Rottenanger, S, Schonert, S, Semenov, D, Skorokhvatov, M, Smirnov, O, Sotnikov, A, Suvorov, Y, 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, 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), 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
antineutrinos, Physics - Instrumentation and Detectors, solar flares, magnetic field: high, neutrino: solar, Physics::Instrumentation and Detectors, Solar neutrino, scintillation counter: liquid, elastic scattering, antineutrino/e: particle identification, 01 natural sciences, 7. Clean energy, neutrino: flux, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], neutrino: supernova, 26.65.+t, 010303 astronomy & astrophysics, Borexino, Elastic scattering, Physics, Solar flare, Supernova Relic Neutrinos, neutrino: energy spectrum, S067EB8, neutrinos, Instrumentation and Detectors (physics.ins-det), neutrino: magnetic moment, Diffuse Supernova Neutrino Background, 3. Good health, Supernova, Homestake, ddc:540, neutrino: flavor, Antineutrino, Neutrino, 97.60.Bw, Homestake experiment, Flare, antineutrino/e: flux, Antineutrinos, 13.15.+G, 26.65.+T, 29.40.Mc, Diffuse supernova neutrino background, Neutrinos, Solar flares, Supernova relic neutrinos, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Supernova relic neutrino, supernova relic neutrinos, NO, Nuclear physics, 13.15.+g, PE2_2, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], diffuse supernova neutrino background, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Astronomy and Astrophysics, neutrino: particle source, Gran Sasso, Solar Flares, 13. Climate action, spectral, High Energy Physics::Experiment, experimental results
Abstract

We report on searches for neutrinos and antineutrinos from astrophysical sources performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. Electron antineutrinos ($\bar{\nu}_e$) are detected in an organic liquid scintillator through the inverse $\beta$-decay reaction. In the present work we set model-independent upper limits in the energy range 1.8-16.8 MeV on neutrino fluxes from unknown sources that improve our previous results, on average, by a factor 2.5. Using the same data set, we first obtain experimental constraints on the diffuse supernova $\bar{\nu}_e$ fluxes in the previously unexplored region below 8 MeV. A search for $\bar{\nu}_e$ in the solar neutrino flux is also presented: the presence of $\bar{\nu}_e$ would be a manifestation of a non-zero anomalous magnetic moment of the neutrino, making possible its conversion to antineutrinos in the strong magnetic field of the Sun. We obtain a limit for a solar $\bar{\nu}_e$ flux of 384 cm$^{-2}$s$^{-1}$ (90% C.L.), assuming an undistorted solar $^{8}$B neutrinos energy spectrum, that corresponds to a transition probability $p_{ \nu_e \rightarrow \bar\nu_{e}}$ 1.8 MeV. At lower energies, by investigating the spectral shape of elastic scattering events, we obtain a new limit on solar $^{7}$Be-$\nu_e$ conversion into $\bar{\nu}_e$ of $p_{ \nu_e \rightarrow \bar \nu_{e}}, Comment: 18 pages, 8 figures, 4 tables, 73 references

Published
2019
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15. 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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16. Thermal diffusion of helium in 238Pu-doped UO2

Author

Philippe E. Raison, Thierry Wiss, P. Van Uffelen, Jean-Yves Colle, V. Di Marcello, Arne Janssen, R.J.M. Konings, and Z. Talip

Subjects
inorganic chemicals, Nuclear and High Energy Physics, Bubble, Uranium dioxide, Analytical chemistry, chemistry.chemical_element, Thermal diffusivity, chemistry.chemical_compound, Nuclear Energy and Engineering, chemistry, Atom, Physics::Atomic and Molecular Clusters, General Materials Science, Physics::Atomic Physics, Knudsen number, Diffusion (business), Atomic physics, Energy source, Helium
Abstract

UO 2 samples doped with 0.1 wt.% plutonium oxide have been investigated with the aim to study alpha-damage effects and the behaviour of radiogenic helium in spent nuclear fuel by single effects studies. Characterizations were performed by X-ray diffraction, scanning and transmission electron microscopy. Helium release rate as a function of temperature and total helium quantity were measured using a Knudsen effusion mass spectrometer and a quantitative gas measurement system, respectively. A new model for the simulation of helium release has been developed taking into account single gas atom and bubble motion, trapping, grain and bubble growth. The model, embedded into commercial multiphysics software, provided a good description of the experimental data and correlations for gas-atom and bubble diffusion coefficients have been proposed. Finally, the effect of radiation damage on helium diffusion was assessed by comparing the results of the present study with literature data.

Published
2014
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17. Towards a multiscale approach for assessing fission product behaviour in UN

Author

A. Schubert, P. Van Uffelen, M. Klipfel, J. van de Laar, and V. Di Marcello

Subjects
Nuclear and High Energy Physics, Nuclear fission product, Fission products, Materials science, Schottky defect, Ab initio, Thermodynamics, 02 engineering and technology, Nitride, 021001 nanoscience & nanotechnology, 7. Clean energy, 01 natural sciences, Crystallography, chemistry.chemical_compound, Nuclear Energy and Engineering, chemistry, Vacancy defect, 0103 physical sciences, General Materials Science, Neutron, 010306 general physics, 0210 nano-technology, Uranium nitride
Abstract

Ab initio modelling of fission products (i.e. Nb, Y, Gd, Nd, Zr, Sm, Eu, Ce, Ba, Mo, Sr, Rh, Pd, and Ru) in uranium nitride is carried out by assessing the incorporation, along with their contributions to local swelling of the fuel matrix. Fission products (FP's) in UN have shown to be preferably accommodated at U vacancies in bound [1 0 0]-Schottky defects, nevertheless, similar incorporation energies were found at a single U vacancy. From the investigated incorporation and migration mechanism, we found that FP's in UN predominately migrate along U–U vacancies, since the incorporation energies for all FP are lowest at single U vacancy or at the U vacancy in a Schottky defect. The energy required to induce a migration of a volatile FP from an N vacancy to U vacancy is about 4–5.5 eV. The local volume changes caused by the fission-product substitution have been assessed by means of DFT and combined with the fission-product concentrations obtained by means of neutron calculations (SCALE) to predict fission product swelling in UN. The linear swelling of nitride fuel resulting from these calculations, and the assumption that fission products do not interact and form secondary phases, leads to a reasonable estimation for the swelling rate as a function of burn-up (or time) when compared with empirical correlations in the open literature.

Published
2013
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18. Extension of the TRANSURANUS code to the fuel rod performance analysis of LBE-cooled nuclear reactors

Author

V. Di Marcello, Lelio Luzzi, P. Botazzoli, and F. Agosti

Subjects
Cladding (metalworking), Nuclear and High Energy Physics, Work (thermodynamics), Fuel rod performance, Radiation, Materials science, Lead-bismuth eutectic, Nuclear engineering, Lead–Bismuth Eutectic, Accelerator-Driven System, T91 steel, Condensed Matter Physics, Corrosion, Creep, Heat transfer, General Materials Science, Eutectic system, Nuclear chemistry
Abstract

This work intends to be a starting point for the extension of the TRANSURANUS fuel rod performance code to the modelling of the T91 steel, which is designed to be the cladding material in LBE (lead–bismuth eutectic) accelerator-driven systems (ADS). On the basis of the experimental data available in the recent literature on LBE and T91, a preliminary modelling of the T91 corrosion with flowing LBE under oxygen control is proposed, and the main issues (i.e., heat transfer, creep, swelling) relevant for the performance of this steel in a reactor are discussed, in order to be properly considered in TRANSURANUS.

Published
2009
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19. Transfer Function Modeling of Zero-Power Dynamics of Circulating Fuel Reactors

Author

Lelio Luzzi, Antonio Cammi, V. Di Marcello, and Claudia Renata Guerrieri

Subjects
Neutron transport, circulating fuel reactor (CFR), molten salt reactor (MSR), system dynamic behavior, Molten salt reactor, Mechanical Engineering, Molten-Salt Reactor Experiment, Nuclear engineering, Energy Engineering and Power Technology, Aerospace Engineering, Mechanical engineering, Nuclear reactor, Coolant, law.invention, Fuel Technology, Nuclear Energy and Engineering, law, Environmental science, Neutron, Molten salt, Delayed neutron
Abstract

In this paper, the zero-power behavior of circulating fuel reactors (CFRs) has been investigated by means of a zero-dimensional neutron kinetics model that provides a simplified but useful approach to the simulation of the dynamics of this class of nuclear reactors. Among CFRs, the most promising is the molten salt reactor (MSR), which is one of the six innovative concepts of reactor proposed by the “Generation IV International Forum” for future nuclear energy supply. One of the key features of CFRs is represented by the fission material, which is dissolved in a liquid mixture that serves both as fuel and coolant. This causes a relevant coupling between neutronics and thermo-hydrodynamics, so that fuel velocity plays a relevant role in determining the dynamic performance of such systems. In the present study, a preliminary model has been developed that is based on the zero-power kinetics equations (i.e., reactivity feedbacks due to temperature change are neglected), modified in order to take into account the effects of the molten salt circulation on the drift of delayed neutron precursors. The system dynamic behavior has been analyzed using the theory of linear systems, and the transfer functions of the neutron density with respect to both reactivity and fuel velocity have been calculated. The developed model has been assessed on the basis of the available experimental data from the molten salt reactor experiment (MSRE) provided by the Oak Ridge National Laboratory. The results of the present work show that the developed simplified theoretical model is well descriptive of the MSRE zero-power dynamics, allowing a preliminary evaluation of the effects due to the circulation of the fuel salt on the neutronics of the system. Moreover, the model is of general validity for any kind of CFRs, and hence is applicable to study other MSR concepts in order to have some indications on the control strategy to be adopted in the MSR development envisaged by Generation IV.

Published
2011

21. Multiscale modelling for the fission gas behaviour in the TRANSURANUS Code

Author

V. Di Marcello, Giovanni Pastore, P. Van Uffelen, and Lelio Luzzi

Subjects
Diffusion equation, Nuclear fuel, Fission, Chemistry, Computation, Fuel Performance, Nuclear Fuel, Intra-granular Diffusion, Mechanics, Simple extension, Finite element method, Power (physics), Nuclear Energy and Engineering, Fission Gas Release, Diffusion (business), Simulation
Abstract

A formulation is proposed for modelling the process of intra-granular diffusion of fission gas during irradiation of UO₂ under both normal operating conditions and power transients. The concept represents a simple extension of the formulation of Speight, including an estimation of the contribution of bubble motion to fission gas diffusion. The resulting equation is formally identical to the diffusion equation adopted in most models that are based on the formulation of Speight, therefore retaining the advantages in terms of simplicity of the mathematical-numerical treatment and allowing application in integral fuel performance codes. The development of the new model proposed here relies on results obtained by means of molecular dynamics simulations as well as finite element computations. The formulation is proposed for incorporation in the TRANSURANUS fuel performance code.

22. 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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23. 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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24. 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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25. Improved Measurement of Solar Neutrinos from the Carbon-Nitrogen-Oxygen Cycle by Borexino and Its Implications for the Standard Solar Model.

Author

Appel S, Bagdasarian Z, Basilico D, Bellini G, Benziger J, Biondi R, Caccianiga B, Calaprice F, Caminata A, Cavalcante P, Chepurnov A, D'Angelo D, Derbin A, Di Giacinto A, Di Marcello V, Ding XF, Di Ludovico A, Di Noto L, Drachnev I, Franco D, Galbiati C, Ghiano C, Giammarchi M, Goretti A, Göttel AS, Gromov M, Guffanti D, Ianni A, Ianni A, Jany A, Kobychev V, Korga G, Kumaran S, Laubenstein M, Litvinovich E, Lombardi P, Lomskaya I, Ludhova L, Lukyanchenko G, Machulin I, Martyn J, Meroni E, Miramonti L, Misiaszek M, Muratova V, Nugmanov R, Oberauer L, Orekhov V, Ortica F, Pallavicini M, Papp L, Pelicci L, Penek Ö, Pietrofaccia L, Pilipenko N, Pocar A, Raikov G, Ranalli MT, Ranucci G, Razeto A, Re A, Redchuk M, Rossi N, Schönert S, Semenov D, Settanta G, Skorokhvatov M, Singhal A, Smirnov O, Sotnikov A, Tartaglia R, Testera G, Unzhakov E, Villante FL, Vishneva A, Vogelaar RB, von Feilitzsch F, Wojcik M, Wurm M, Zavatarelli S, Zuber K, and Zuzel G

Abstract

We present an improved measurement of the carbon-nitrogen-oxygen (CNO) solar neutrino interaction rate at Earth obtained with the complete Borexino Phase-III dataset. The measured rate, R&#95;{CNO}=6.7&#95;{-0.8}^{+2.0}  counts/(day×100  tonnes), allows us to exclude the absence of the CNO signal with about 7σ C.L. The correspondent CNO neutrino flux is 6.6&#95;{-0.9}^{+2.0}×10^{8}  cm^{-2} s^{-1}, taking into account the neutrino flavor conversion. We use the new CNO measurement to evaluate the C and N abundances in the Sun with respect to the H abundance for the first time with solar neutrinos. Our result of N&#95;{CN}=(5.78&#95;{-1.00}^{+1.86})×10^{-4} displays a ∼2σ tension with the "low-metallicity" spectroscopic photospheric measurements. Furthermore, our result used together with the ^{7}Be and ^{8}B solar neutrino fluxes, also measured by Borexino, permits us to disfavor at 3.1σ C.L. the "low-metallicity" standard solar model B16-AGSS09met as an alternative to the "high-metallicity" standard solar model B16-GS98.

Published
2022
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26. First Directional Measurement of Sub-MeV Solar Neutrinos with Borexino.

Author

Agostini M, Altenmüller K, Appel S, Atroshchenko V, Bagdasarian Z, Basilico D, Bellini G, Benziger J, Biondi R, Bravo D, Caccianiga B, Calaprice F, Caminata A, Cavalcante P, Chepurnov A, D'Angelo D, Davini S, Derbin A, Di Giacinto A, Di Marcello V, Ding XF, Di Ludovico A, Di Noto L, Drachnev I, Formozov A, Franco D, Galbiati C, Ghiano C, Giammarchi M, Goretti A, Göttel AS, Gromov M, Guffanti D, Ianni A, Ianni A, Jany A, Jeschke D, Kobychev V, Korga G, Kumaran S, Laubenstein M, Litvinovich E, Lombardi P, Lomskaya I, Ludhova L, Lukyanchenko G, Lukyanchenko L, Machulin I, Martyn J, Meroni E, Meyer M, Miramonti L, Misiaszek M, Muratova V, Neumair B, Nieslony M, Nugmanov R, Oberauer L, Orekhov V, Ortica F, Pallavicini M, Papp L, Pelicci L, Penek Ö, Pietrofaccia L, Pilipenko N, Pocar A, Raikov G, Ranalli MT, Ranucci G, Razeto A, Re A, Redchuk M, Romani A, Rossi N, Schönert S, Semenov D, Settanta G, Skorokhvatov M, Singhal A, Smirnov O, Sotnikov A, Suvorov Y, Tartaglia R, Testera G, Thurn J, Unzhakov E, Vishneva A, Vogelaar RB, von Feilitzsch F, Wessel A, Wojcik M, Wonsak B, Wurm M, Zavatarelli S, Zuber K, and Zuzel G

Abstract

We report the measurement of sub-MeV solar neutrinos through the use of their associated Cherenkov radiation, performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The measurement is achieved using a novel technique that correlates individual photon hits of events to the known position of the Sun. In an energy window between 0.54 to 0.74 MeV, selected using the dominant scintillation light, we have measured 10 887&#95;{-2103}^{+2386}(stat)±947(syst) (68% confidence interval) solar neutrinos out of 19 904 total events. This corresponds to a ^{7}Be neutrino interaction rate of 51.6&#95;{-12.5}^{+13.9}  counts/(day·100  ton), which is in agreement with the standard solar model predictions and the previous spectroscopic results of Borexino. The no-neutrino hypothesis can be excluded with >5σ confidence level. For the first time, we have demonstrated the possibility of utilizing the directional Cherenkov information for sub-MeV solar neutrinos, in a large-scale, high light yield liquid scintillator detector. This measurement provides an experimental proof of principle for future hybrid event reconstruction using both Cherenkov and scintillation signatures simultaneously.

Published
2022
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27. Development and preliminary evaluation of a real-time polymerase chain reaction for the identification of Culicoides obsoletus sensu strictu, C. scoticus and C. montanus in the Obsoletus Complex in Italy.

Author

Monaco F, Benedetto L, Di Marcello V, Lelli R, and Goffredo M

Subjects
Animals, Italy, Ceratopogonidae classification, Polymerase Chain Reaction methods
Abstract

A real-time polymerase chain reaction (PCR) using a green fluorescence dye, followed by a comparison of derivative melting curves in the post-amplification phase, was developed to distinguish species of Culicoides within the Obsoletus Complex. The selected target sequence was internal transcribed spacer 2 (ITS 2) of the ribosomal DNA (rDNA). Using the newly developed method, 140 midges were morphologically classified in the Obsoletus Complex and were processed. The results were compared to those obtained by combining the morphological identification with the gel based reverse transcriptase (RT)-PCR. By analysing the species-specific pattern of the dissociation curves, it was possible to identify 52 midges as Culicoides scoticus, 82 midges as C. obsoletus sensu strictu and 6 as C. montanus. These results matched those obtained by the combination of gel-based PCR and morphological identification used on a routine basis. Given its diagnostic flexibility, rapid results, automation capability, high quality result performance and expression, the real-time ITS 2 rDNA PCR appears to be more functional and efficient than the gel-based PCR, especially when dealing with large-scale monitoring of midges belonging to the Obsoletus Complex.

Published
2010

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