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Wyświetlanie 1-10 z 117
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
Inne
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
Artykuł
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
Artykuł
Tytuł:
Search for high energy 5.5 MeV solar axions with the complete Borexino dataset
Autorzy:
Settanta, G.
Testera, G.
D’Angelo, D.
Zavatarelli, S.
Jany, Anna
Pocar, A.
Di Noto, L.
Ranalli, M. T.
Martyn, J.
Caminata, A.
Caccianiga, B.
Kumaran, S.
Orekhov, V.
Pilipenko, N.
Pallavicini, M.
Singhal, A.
Di Marcello, V.
Pelicci, L.
Ranucci, G.
Ortica, F.
Machulin, I.
Chepurnov, A.
Ding, X. F.
Misiaszek, Marcin
Pietrofaccia, L.
Skorokhvatov, M.
Rossi, N.
Kobychev, V.
Bellini, G.
Re, A.
Vishneva, A.
Zuzel, Grzegorz
Biondi, R.
Miramonti, L.
Sotnikov, A.
Calaprice, F.
Giammarchi, M.
von Feilitzsch, F.
Ghiano, C.
Di Ludovico, A.
Guffanti, D.
Ludhova, L.
Oberauer, L.
Schönert, S.
Benziger, J.
Derbin, A.
Drachnev, I.
Basilico, D.
Razeto, A.
Vogelaar, R. B.
Zuber, K.
Di Giacinto, A.
Galbiati, C.
Meroni, E.
Litvinovich, E.
Penek, Ö.
Lombardi, P.
Wurm, M.
Unzhakov, E.
Goretti, A.
Ianni, Andrea
Muratova, V.
Semenov, D.
Ianni, Aldo
Wójcik, Marcin
Tartaglia, R.
Lomskaya, I.
Smirnov, O.
Raikov, G.
Franco, D.
Nugmanov, R.
Gromov, M.
Korga, G.
Laubenstein, M.
Opis:
A search for solar axions and axion-like particles produced in the $p + d \to ^{3}He + A$ (5.5 MeV) reaction was performed using the complete dataset of the Borexino detector (3995 days of measurement live-time). The following interaction processes have been considered: axion decay into two photons ($A \to 2\gamma$), inverse Primakoff conversion on nuclei ($A + Z \to \gamma + Z$), the Compton conversion of axions to photons ($A + e \to e + \gamma$) and the axio-electric effect ($A + e + Z \to e + Z$). Model-independent limits on product of axion–photon ($g_{A\gamma}$), axion–electron ($g_{Ae}$), and isovector axion–nucleon ($g_{3AN}$) couplings are obtained: $\left | g_{A\gamma} \times g_{3AN} \right | \leq 2.3 \times 10^{-11} GeV^{-1}$ and $\left | g_{Ae} \times g_{3AN} \right | \leq 1.9 \times 10^{-13}$ at $m_{A} < 1 MeV$ (90% c.l.). The Borexino results exclude new large regions of $g_{A\gamma}$, and $g_{Ae}$ coupling constants and axion masses $m_{A}$, and leads to constraints on the products $\left | g_{A\gamma} \times m_{A} \right |$ and $\left | g_{Ae} \times m_{A} \right |$ for the KSVZ- and the DFSZ-axion models.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
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
Inne
Tytuł:
Borexino’s search for low-energy neutrinos associated with gravitational wave events from GWTC-3 database
Autorzy:
Settanta, G.
Testera, G.
D’Angelo, D.
Zavatarelli, S.
Jany, Anna
Pocar, A.
Di Noto, L.
Ranalli, M. T.
Martyn, J.
Caminata, A.
Caccianiga, B.
Kumaran, S.
Orekhov, V.
Pilipenko, N.
Pallavicini, M.
Singhal, A.
Di Marcello, V.
Pelicci, L.
Ranucci, G.
Ortica, F.
Machulin, I.
Chepurnov, A.
Ding, X. F.
Misiaszek, Marcin
Pietrofaccia, L.
Skorokhvatov, M.
Rossi, N.
Kobychev, V.
Bellini, G.
Re, A.
Vishneva, A.
Zuzel, Grzegorz
Biondi, R.
Miramonti, L.
Sotnikov, A.
Calaprice, F.
Giammarchi, M.
von Feilitzsch, F.
Ghiano, C.
Di Ludovico, A.
Guffanti, D.
Ludhova, L.
Oberauer, L.
Schönert, S.
Benziger, J.
Derbin, A.
Drachnev, I.
Basilico, D.
Vogelaar, R. B.
Zuber, K.
Di Giacinto, A.
Galbiati, C.
Meroni, E.
Litvinovich, E.
Penek, Ö.
Lombardi, P.
Wurm, M.
Unzhakov, E.
Goretti, A.
Ianni, Andrea
Muratova, V.
Semenov, D.
Ianni, Aldo
Wójcik, Marcin
Tartaglia, R.
Lomskaya, I.
Smirnov, O.
Raikov, G.
Franco, D.
Nugmanov, R.
Gromov, M.
Korga, G.
Laubenstein, M.
Opis:
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 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 ($v_{e}, v_{\mu}, v_{\tau}$) at the level $10^{9} - 10^{15} cm^{-2} GW^{-1}$ have been obtained in the 0.5–5 MeV neutrino energy range.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Improved measurement of solar neutrinos from the carbon-nitrogen-oxygen cycle by Borexino and its implications for the standard solar model
Autorzy:
Vogelaar, R. B.
Miramonti, L.
Franco, D.
Drachnev, I.
Cavalcante, P.
Ianni, Andrea
Unzhakov, E.
Goretti, A.
Orekhov, V.
Lombardi, P.
Sotnikov, A.
Ranalli, M. T.
Korga, G.
Guffanti, D.
Vishneva, A.
Di Giacinto, A.
Misiaszek, Marcin
Razeto, A.
Kumaran, S.
Zuber, K.
Bagdasarian, Z.
Pallavicini, M.
Redchuk, M.
Wurm, M.
Bellini, G.
Penek, Ö.
Kobychev, V.
Nugmanov, R.
Basilico, D.
Martyn, J.
Di Ludovico, A.
Villante, F. L.
Biondi, R.
Semenov, D.
Settanta, G.
Ding, X. F.
Ortica, F.
Skorokhvatov, M.
Di Marcello, V.
Zuzel, Grzegorz
Gromov, M.
Ranucci, G.
Re, A.
Pelicci, L.
Tartaglia, R.
Caminata, A.
Caccianiga, B.
Oberauer, L.
Raikov, G.
Chepurnov, A.
Benziger, J.
Ghiano, C.
Schönert, S.
Singhal, A.
Pocar, A.
Papp, L.
von Feilitzsch, F.
Testera, G.
Zavatarelli, S.
Jany, Anna
Lomskaya, I.
Pilipenko, N.
Lukyanchenko, G.
Meroni, E.
Appel, S.
Ludhova, L.
Laubenstein, M.
Smirnov, O.
Wójcik, Marcin
Calaprice, F.
Pietrofaccia, L.
Di Noto, L.
Machulin, I.
Ianni, Aldo
Giammarchi, M.
Rossi, N.
D’Angelo, D.
Derbin, A.
Muratova, V.
Galbiati, C.
Göttel, A. S.
Litvinovich, E.
Opis:
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, $R_{CNO}=6.7_{-0.8}^{+2.0}$ counts (day $\times$ 100 tonnes), allows us to exclude the absence of the CNO signal with about 7$\sigma$ C.L. The correspondent CNO neutrino flux is $6.6_{-0.9}^{+2.0} \times 10^{8} cm^{-2}s^{-1}$, 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 $N_{CN}=(5.78_{-1.00}^{+1.86})\times 10^{-4}$ displays a ∼ 2$\sigma$ 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 3.1$\sigma$ C.L. the "low-metallicity" standard solar model B16-AGSS09met as an alternative to the "high-metallicity" standard solar model B16-GS98.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 117

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