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001     1038442
005     20250203124514.0
024 7 _ |a 10.1103/PhysRevD.109.112014
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024 7 _ |a 10.34734/FZJ-2025-01438
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037 _ _ |a FZJ-2025-01438
082 _ _ |a 530
100 1 _ |a Basilico, D.
|b 0
245 _ _ |a Optimized α / β pulse shape discrimination in Borexino
260 _ _ |a Ridge, NY
|c 2024
|b American Physical Society
336 7 _ |a article
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520 _ _ |a 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 𝑝⁢𝑝 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.
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700 1 _ |a Bellini, G.
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700 1 _ |a Benziger, J.
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700 1 _ |a Biondi, R.
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700 1 _ |a Caccianiga, B.
|b 4
700 1 _ |a Calaprice, F.
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700 1 _ |a Caminata, A.
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700 1 _ |a Chepurnov, A.
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700 1 _ |a D’Angelo, D.
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700 1 _ |a Derbin, A.
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700 1 _ |a Di Giacinto, A.
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700 1 _ |a Di Marcello, V.
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700 1 _ |a Ding, X. F.
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700 1 _ |a Di Ludovico, A.
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700 1 _ |a Di Noto, L.
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700 1 _ |a Drachnev, I.
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700 1 _ |a Franco, D.
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700 1 _ |a Galbiati, C.
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700 1 _ |a Ghiano, C.
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700 1 _ |a Giammarchi, M.
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700 1 _ |a Goretti, A.
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700 1 _ |a Gromov, M.
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700 1 _ |a Guffanti, D.
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700 1 _ |a Ianni, Aldo
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700 1 _ |a Ianni, Andrea
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700 1 _ |a Jany, A.
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700 1 _ |a Kobychev, V.
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700 1 _ |a Korga, G.
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700 1 _ |a Kumaran, S.
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700 1 _ |a Laubenstein, M.
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700 1 _ |a Litvinovich, E.
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700 1 _ |a Lombardi, P.
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700 1 _ |a Lomskaya, I.
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700 1 _ |a Ludhova, L.
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700 1 _ |a Machulin, I.
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700 1 _ |a Martyn, J.
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700 1 _ |a Meroni, E.
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700 1 _ |a Miramonti, L.
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700 1 _ |a Misiaszek, M.
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700 1 _ |a Muratova, V.
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700 1 _ |a Nugmanov, R.
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700 1 _ |a Oberauer, L.
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700 1 _ |a Orekhov, V.
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700 1 _ |a Ortica, F.
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700 1 _ |a Pallavicini, M.
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700 1 _ |a Pelicci, L.
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700 1 _ |a Penek, Ö.
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700 1 _ |a Pietrofaccia, L.
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700 1 _ |a Pilipenko, N.
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700 1 _ |a Pocar, A.
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700 1 _ |a Raikov, G.
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700 1 _ |a Ranalli, M. T.
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700 1 _ |a Ranucci, G.
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700 1 _ |a Razeto, A.
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700 1 _ |a Re, A.
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700 1 _ |a Rossi, N.
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700 1 _ |a Schönert, S.
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700 1 _ |a Semenov, D.
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700 1 _ |a Settanta, G.
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700 1 _ |a Skorokhvatov, M.
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700 1 _ |a Singhal, A.
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700 1 _ |a Smirnov, O.
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700 1 _ |a Sotnikov, A.
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700 1 _ |a Tartaglia, R.
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700 1 _ |a Testera, G.
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700 1 _ |a Unzhakov, E.
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700 1 _ |a Vishneva, A.
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700 1 _ |a Vogelaar, R. B.
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700 1 _ |a von Feilitzsch, F.
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700 1 _ |a Wojcik, M.
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700 1 _ |a Wurm, M.
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700 1 _ |a Zavatarelli, S.
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700 1 _ |a Zuber, K.
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700 1 _ |a Zuzel, G.
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773 _ _ |a 10.1103/PhysRevD.109.112014
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