Wszystkie pola: Pocar, Andrea

Skocz do pozycji: 1.

Tytuł:: Borexino : geo-neutrino measurement at Gran Sasso, Italy
Autorzy:: von Feilitzsch, Franz
Wójcik, Marcin
Muratova, Valentina
Gromov, Maxim
Obolensky, Michel
Schoenert, Stefan
Bick, Daniel
Caminata, Alessio
Testera, Gemma
Laubenstein, Matthias
Toropova, Maria
Unzhakov, Evgenii
Hungerford, Ed
Montuschi, Michele
Simgen, Hardy
Maneschg, Werner
Lehnert, Bjoern
Wurm, Michael
Altenmueller, Konrad
Galbiati, Cristian
Franco, Davide
Lombardi, Paolo
Kobychev, Vladislav
Gabriele, Federico
Suvorov, Yury
Miramonti, Lino
Vogelaar, Robert Bruce
Zuber, Kai
Ianni, Andrea
Pallavicini, Marco
Manecki, Szymon
Roncin, Romain
Ludhova, Livia
Drachnev, Ilya
Razeto, Alessandro
Re, Alessandra
Zavatarelli, Sandra
Vishneva, Alina
Skorokhvatov, Mikhail
Davini, Stefano
Etenko, Alexander
Ranucci, Gioacchino
Ortica, Fausto
Meroni, Emanuela
Agostini, Matteo
Bravo, David
Oberauer, Lothar
Calaprice, Frank
Kryn, Didier
Formozov, Andrey
Papp, Laszlo
Yokley, Zachary
D'Angelo, Davide
Korga, Gyorgy
Bonfini, Giuseppe
Romani, Aldo
Chepurnov, Alexander
Meyer, Mikko
Misiaszek, Marcin
Litvinovich, Evgeny
Winter, Juergen
Semenov, Dmitrii
Cavalcante, Paolo
Goeger-Neff, Marianne
Lombardi, Francesco
Hagner, Caren
Tartaglia, Roberto
Di Noto, Lea
Ianni, Aldo
Giammarchi, Marco
Jeschke, Dominik
Bellini, Gianpaolo
Rossi, Nicola
Caccianiga, Barbara
Korablev, Denis
Machulin, Igor
Benziger, Jay
Derbin, Alexander
Thurn, Jan
Jędrzejczak, Karol
Weinz, Stefan
Appel, Simon
Perasso, Laura
Zaimidoroga, Oleg
Goretti, Augusto
Fomenko, Kirill
Neumair, Birgit
Zuzel, Grzegorz
Pocar, Andrea
Sukhotin, Serguei
Smirnov, Oleg
Mosteiro, Pablo
Wang, Hanguo
Ghiano, Chiara
Sotnikov, Albert
Marcocci, Simone
Lukyanchenko, Georgy
Opis:: 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. After a brief introduction of the geo-neutrinos' properties and of the main aims of their study, we discuss the features of a detector which has recently provided breakthrough achievements in the field, Borexino, a massive, calorimetric liquid scintillator detector installed at the underground Gran Sasso Laboratory. With its unprecedented radiopurity levels achieved in the core of the detection medium, it is the only experiment in operation able to study in real time solar neutrino interactions in the challenging sub-MeV energy region. Its superior technical properties allowed Borexino also to provide a clean detection of terrestrial neutrinos. Therefore, the description of the characteristics of the detected geo-neutrino signal and of the corresponding geological implications are the main core of the discussion contained in this work.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Solar neutrinos spectroscopy with Borexino Phase-II
Autorzy:: Razeto, Alessandro
von Feilitzsch, Franz
Penek, Omer
Vishneva, Alina
Ludhova, Livia
Caccianiga, Barbara
Zavatarelli, Sandra
Redchuk, Mariia
Formozov, Andrey
Sotnikov, Albert
Lombardi, Paolo
Cavanna, Francesca
Testera, Gemma
Pocar, Andrea
Maricic, Jelena
Atroshchenko, Victor
Gabriele, Federico
Calaprice, Frank
Houdy, Thibaut
Caprioli, Silvia
Thurn, Jan
Ianni, Aldo
Miramonti, Lino
Zaimidoroga, Oleg
Machulin, Igor
Chepurnov, Alexander
Litvinovich, Evgeny
Misiaszek, Marcin
Zuber, Kai
Weinz, Stefan
Choi, Koun
Muratova, Valentina
Ding, XueFeng
Korga, Gyorgy
Derbin, Alexander
Pietrofaccia, Lidio
Marcocci, Simone
Altenmueller, Konrad
Bravo, David
Smirnov, Oleg
Romani, Aldo
Meroni, Emanuela
Giammarchi, Marco
Hungerford, Ed
Drachnev, Ilia
Schoeenert, Stefan
Bolognino, Irene
Guffanti, Daniele
Ianni, Andrea
Ghiano, Chiara
Benziger, Jay
Franco, Davide
Wójcik, Marcin
Basilico, Davide
Ortica, Fausto
Semenov, Dmitrii
Ranucci, Gioacchino
Lukyanchenko, Georgy
Lukyanchenko, Liudmila
Korablev, Denis
Di Noto, Lea
Caminata, Alessio
Jany, Anna
Stokes, Lee F. F.
Agostini, Matteo
Neumair, Birgit
Pallavicini, Marco
Toropova, Maria
Fomenko, Kirill
Laubenstein, Matthias
Skorokhvatov, Mikhail
Lachenmaier, Tobias
Unzhakov, Evgenii
Orekhov, Vsevolod
Rottenanger, Sebastian
Bick, Daniel
Collica, Laura
Galbiati, Cristiano
Yokley, Zachary
Porcelli, Alessio
Raikov, Georgy
Kobychev, Vladislav
Bagdasarian, Zara
Opitz, Bjoern
Rossi, Nicola
Gromov, Maxim
Cavalcante, Paolo
Appel, Simon
Manuzio, Giulio
Carlini, Marco
Meyer, Mikko
Martyn, Johann
Bellini, Gianpaolo
Lombardi, Francesco
Zuzel, Grzegorz
Hagner, Caren
Re, Alessandra
Davini, Stefano
Pilipenko, Nelly
Oberauer, Lothar
Goretti, Augusto
Papp, Laszlo
Vogelaar, Bruce
Suvorov, Yura
Gschwender, Michael
Bonfini, Giuseppe
Di Ludovico, Antonio
Tartaglia, Roberto
Jeschke, Dominik
Opis:: Solar neutrinos have played a central role in the discovery of the neutrino oscillation mechanism. They still are proving to be a unique tool to help investigate the fusion reactions that power stars and further probe basic neutrino properties. The Borexino neutrino observatory has been operationally acquiring data at Laboratori Nazionali del Gran Sasso in Italy since 2007. Its main goal is the real-time study of low energy neutrinos (solar or originated elsewhere, such as geo-neutrinos). The latest analysis of experimental data, taken during the so-called Borexino Phase-II (2011-present), will be showcased in this talk—yielding new high-precision, simultaneous wide band flux measurements of the four main solar neutrino components belonging to the "pp" fusion chain (pp, pep, 7 Be, 8 B), as well as upper limits on the remaining two solar neutrino fluxes (CNO and hep).
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Directionality measurement of CNO neutrinos with Borexino detector
Autorzy:: Gromov, M.
Pallavicini, M.
Zavatarelli, S.
Ranucci, G.
Jany, Anna
Miramonti, L.
Lomskaya, I.
Franco, D.
Ranalli, M.T.
Re, A.
Wurm, M.
Drachnev, I.
Pilipenko, N.
Ianni, Andrea
Bellini, G.
Villante, F.L.
Pelicci, L.
Meroni, E.
Penek, Ö.
Unzhakov, E.
Tartaglia, R.
Goretti, A.
Kobychev, V.
Ludhova, L.
Nugmanov, R.
Caminata, A.
Orekhov, V.
Laubenstein, M.
Smirnov, O.
Caccianiga, B.
Oberauer, L.
Lombardi, P.
Testera, G.
Raikov, G.
Calaprice, F.
Sotnikov, A.
Martyn, J.
Pietrofaccia, L.
Di Noto, L.
Machulin, I.
Korga, G.
Di Ludovico, A.
Vogelaar, R.B.
Guffanti, D.
Biondi, R.
Semenov, D.
Settanta, G.
Ding, X.F.
Ianni, Aldo
Giammarchi, M.
Chepurnov, A. S.
Benziger, J.
Vishneva, A.
Ortica, F.
Ghiano, C.
Rossi, N.
Di Giacinto, A.
Schönert, S.
Singhal, A.
Pocar, A.
D’Angelo, D.
Derbin, A.
Misiaszek, Marcin
Muratova, V.
Razeto, A.
Di Marcello, V.
Galbiati, C.
Skorokhvatov, M.
Basilico, Davide
Kumaran, S.
von Feilitzsch, F.
Zuber, K.
Zuzel, Grzegorz
Wójcik, Marcin
Litvinovich, E.
Opis:: In the following, the first measurement of CNO solar neutrinos obtained by Borexino by exploiting the directional information retained by solar neutrino is summarized [1]. The Correlated Integrated Directionality (CID) method makes use of the sub-dominant Cherenkov light emitted by the Borexino liquid scintillator to correlate between the first few detected photons in each event and the known position of the Sun for each event and, therefore, to discriminate between the signal and the radioactive background on a statistical basis. By applying this technique to the complete 2007-2021 Borexino dataset, the hypothesis of no CNO neutrinos is rejected with >5𝜎 posterior probability, without making use of any information on the background levels in the scintillator.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: The study of neutrinos and antineutrinos from astrophysical sources by Borexino
Autorzy:: Ghiano, C.
Gromov, M.
Ianni, Aldo
Laubenstein, M.
Semenov, D.
von Feilitzsch, F.
Muratova, V.
Pallavicini, M.
Di Giacinto, A.
Penek, O.
Tartaglia, R.
Di Noto, L.
Guffanti, D.
Goretti, A.
Machulin, I.
Wójcik, Marcin
Chepurnov, A.
Sotnikov, A.
Pocar, A.
Raikov, G.
Biondi, R.
Kumaran, S.
Nugmanov, R.
Ding, X. F.
Pelicci, L.
Caminata, A.
Oberauer, L.
Skorokhvatov, M.
Drachnev, I.
Meroni, E.
D'Angelo, D.
Unzhakov, E.
Wurm, M.
Villante, F. L.
Bellini, G.
Di Ludovico, A.
Derbin, A.
Pilipenko, N.
Galbiati, C.
Vishneva, A.
Rossi, N.
Calaprice, F.
Di Marcello, V.
Ranalli, M. T.
Franco, D.
Martyn, J.
Smirnov, O.
Zuzel, Grzegorz
Jany, Anna
Razeto, A.
Miramonti, L.
Settanta, G.
Singhal, A.
Pietrofaccia, L.
Re, A.
Ortica, F.
Schönert, S.
Testera, G.
Zavatarelli, Sandra
Giammarchi, M.
Ludhova, L.
Ianni Andrea
Misiaszek, Marcin
Orekhov, V.
Ranucci, G.
Caccianiga, B.
Benziger, J.
Lomskaya, I.
Vogelaar, R. B.
Litvinovich, E.
Basilico, D.
Kobychev, V.
Korga, G.
Zuber, K.
Lombardi, P.
Opis:: The recent observation of CNO solar neutrinos by Borexino (BX) has proven the high potential offered by large underground ultrapure liquid scintillators to disclose weak neutrino and antineutrino fluxes. Supernovae explosions, gamma-ray bursts, solar flares and Gravitational Waves (GW) are among the possible extra-terrestrial sources of neutrinos and antineutrinos. The extreme radiopurity of the BX detector has already allowed to get the best upper limits on all flavor fluences in the few MeV energy range from gamma ray bursts, to set limits on the diffuse supernova antineutrino background in the unexplored energy region below 8 MeV and to get the strongest upper limits on fast radio bursts associated neutrino fluences up to 50 MeV. Recently, BX has searched for neutrino events in correlation with GW events from 2015 to 2020 using the BX data-set of the same periods. The strongest upper limits on GW-associated neutrino and antineutrino fluences have been obtained in the (0.5 - 5.0) MeV neutrino energy range.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Final results of Borexino on CNO solar neutrinos
Autorzy:: Gromov, M.
Pallavicini, M.
Zavatarelli, S.
Vogelaar, R. B.
Ranucci, G.
Jany, Anna
Miramonti, L.
Lomskaya, I.
Franco, D.
Re, A.
Wurm, M.
Drachnev, I.
Pilipenko, N.
Ianni, Andrea
Bellini, G.
Pelicci, L.
Meroni, E.
Penek, Ö.
Unzhakov, E.
Tartaglia, R.
Goretti, A.
Kobychev, V.
Ludhova, L.
Basilico, D.
Caminata, A.
Nugmanov, R.
Orekhov, V.
Laubenstein, M.
Smirnov, O.
Caccianiga, B.
Oberauer, L.
Lombardi, P.
Testera, G.
Raikov, G.
Calaprice, F.
Sotnikov, A.
Martyn, J.
Ranalli, M. T.
Pietrofaccia, L.
Di Noto, L.
Machulin, I.
Korga, G.
Di Ludovico, A.
Guffanti, D.
Villante, F. L.
Biondi, R.
Semenov, D.
Settanta, G.
Chepurnov, A.
Ding, X. F.
Ianni, Aldo
Giammarchi, M.
Benziger, J.
Vishneva, A.
Ortica, F.
Ghiano, C.
Rossi, N.
Di Giacinto, A.
Schönert, S.
Singhal, A.
Pocar, A.
D’Angelo, D.
Derbin, A.
Misiaszek, Marcin
Muratova, V.
Razeto, A.
Di Marcello, V.
Galbiati, C.
Skorokhvatov, M.
Kumaran, S.
von Feilitzsch, F.
Zuber, K.
Zuzel, Grzegorz
Wójcik, Marcin
Litvinovich, E.
Opis:: In this paper, we report the first measurement of CNO solar neutrinos by Borexino that uses the correlated integrated directionality (CID) method, exploiting the subdominant Cherenkov light in the liquid scintillator detector. The directional information of the solar origin of the neutrinos is preserved by the early Cherenkov photons from the neutrino scattered electrons and is used to discriminate between signal and background. The directional information is independent from the spectral information on which the previous CNO solar neutrino measurements by Borexino were based, except for the selection of the energy region of interest. While the CNO spectral analysis could only be applied on the Phase-III dataset, the directional analysis can use the complete Borexino data taking period from 2007 to 2021. The absence of CNO neutrinos has been rejected with $> 5\sigma$ posterior probability using the Bayesian statistics. The directional CNO measurement is obtained without an external constraint on the $^{210}$Bi contamination of the liquid scintillator, which was applied in the spectral analysis approach. The final and the most precise CNO measurement of Borexino is then obtained by combining the new CID-based CNO result with an improved spectral fit of the Phase-III dataset. Including the statistical and the systematic errors, the extracted CNO interaction rate is $R(CNO) = 6.7^{+1.2}_{-0.8}$ cpd/100 tonnes. Taking into account the neutrino flavor conversion, the resulting CNO neutrino flux at Earth is $\Phi_{CNO} = 6.7^{+1.2}_{-0.8} \times 10^{8} cm^{-2}s^{-1}$, which is found to be in agreement with the high metallicity standard solar models. This outcome, combined with the $^{7}$Be and $^{8}$B fluxes measurements previously obtained by Borexino, can be used to disfavor the low metallicity SSM B16-AGSS09met model at 3.2$\sigma$ CL, assuming the SSM B16-GS98 high metallicity model to be true. Also, the sum of C and N abundances in the solar core with respect to the H abundance is evaluated with improved precision, resulting in $N_{CN} = 5.81^{+1.22}_{-0.94} \times 10^{-4}$, which is compatible with the high metallicity scenario and exhibits a 2$\sigma$ tension with the low metallicity case. The results described in this work reinforce the role of directional Cherenkov light in large-scale liquid scintillator detectors and open up new avenues for the next-generation liquid scintillator or hybrid neutrino experiments. A particular relevance is expected for the latter detectors, which aim to combine the advantages from both Cherenkov-based and scintillation-based detection techniques.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: Optimized $\alpha / \beta$ pulse shape discrimination in Borexino
Autorzy:: Gromov, M.
Pallavicini, M.
Zavatarelli, S.
Vogelaar, R. B.
Ranucci, G.
Jany, Anna
Miramonti, L.
Lomskaya, I.
Franco, D.
Re, A.
Wurm, M.
Drachnev, I.
Pilipenko, N.
Ianni, Andrea
Bellini, G.
Pelicci, L.
Meroni, E.
Penek, Ö.
Unzhakov, E.
Tartaglia, R.
Goretti, A.
Kobychev, V.
Ludhova, L.
Basilico, D.
Caminata, A.
Nugmanov, R.
Orekhov, V.
Laubenstein, M.
Smirnov, O.
Caccianiga, B.
Oberauer, L.
Lombardi, P.
Testera, G.
Raikov, G.
Calaprice, F.
Sotnikov, A.
Martyn, J.
Ranalli, M. T.
Pietrofaccia, L.
Di Noto, L.
Machulin, I.
Korga, G.
Di Ludovico, A.
Guffanti, D.
Biondi, R.
Semenov, D.
Settanta, G.
Chepurnov, A.
Ding, X. F.
Ianni, Aldo
Giammarchi, M.
Benziger, J.
Vishneva, A.
Ortica, F.
Ghiano, C.
Rossi, N.
Di Giacinto, A.
Schönert, S.
Singhal, A.
Pocar, A.
D’Angelo, D.
Derbin, A.
Misiaszek, Marcin
Muratova, V.
Razeto, A.
Di Marcello, V.
Galbiati, C.
Skorokhvatov, M.
Kumaran, S.
von Feilitzsch, F.
Zuber, K.
Zuzel, Grzegorz
Wójcik, Marcin
Litvinovich, E.
Opis:: Borexino could efficiently distinguish between α and β radiation in its liquid scintillator by the characteristic time profile of its scintillation pulse. This α/β discrimination, first demonstrated on the ton scale in the counting test facility prototype, was used throughout the lifetime of the experiment between 2007 and 2021. With this method, the α events are identified and subtracted from the solar neutrino events similar to β. This is particularly important in liquid scintillators, as the α scintillation is strongly quenched. In Borexino, the prominent $^{210}$Po decay peak was a background in the energy range of electrons scattered from $^{7}$Be solar neutrinos. Optimal α/β discrimination was achieved with a multilayer perceptron neural network, with a higher ability to leverage the timing information of the scintillation photons detected by the photomultiplier tubes. An event-by-event, high efficiency, stable, and uniform pulse shape discrimination was essential in characterizing the spatial distribution of background in the detector. This benefited most Borexino measurements, including solar neutrinos in the pp chain and the first direct observation of the CNO cycle in the Sun. This paper presents key milestones in α/β discrimination in Borexino as a term of comparison for current and future large liquid scintillator detectors.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego