Journal Article

GSI-2022-00442

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Correlated and integrated directionality for sub-MeV solar neutrinos in Borexino

Agostini, M. (Corresponding author) ; 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, X. F. ; Di Ludovico, A. ; Di Noto, L. ; Drachnev, I. ; Formozov, A. ; Franco, D. ; Galbiati, C. ; Ghiano, C. ; Giammarchi, M. ; Goretti, A. ; Göttel, A. S. ; 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. (Corresponding author) ; 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, M. T. ; 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, R. B. ; von Feilitzsch, F. ; Wessel, A.GSI* ; Wojcik, M. ; Wonsak, B. ; Wurm, M. ; Zavatarelli, S. ; Zuber, K. ; Zuzel, G.

2022
Inst. Melville, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevD.105.052002  doi:10.15120/GSI-2022-00442

Report No.: arXiv:2109.04770

Abstract: Liquid scintillator detectors play a central role in the detection of neutrinos from various sources. In particular, it is the only technique used so far for the precision spectroscopy of sub-MeV solar neutrinos, as demonstrated by the Borexino experiment at the Gran Sasso National Laboratory in Italy. The benefit of a high light yield, and thus a low energy threshold and a good energy resolution, comes at the cost of the directional information featured by water Cherenkov detectors, measuring 8B solar neutrinos above a few MeV. In this paper we provide the first directionality measurement of sub-MeV solar neutrinos which exploits the correlation between the first few detected photons in each event and the known position of the Sun for each event. This is also the first signature of directionality in neutrinos elastically scattering off electrons in a liquid scintillator target. This measurement exploits the subdominant, fast Cherenkov light emission that precedes the dominant yet slower scintillation light signal. Through this measurement, we have also been able to extract the rate of 7Be solar neutrinos in Borexino. The demonstration of directional sensitivity in a traditional liquid scintillator target paves the way for the possible exploitation of the Cherenkov light signal in future kton-scale experiments using liquid scintillator targets. Directionality is important for background suppression as well as the disentanglement of signals from various sources.

Note: ISSN 2470-0029 not unique: **3 hits**. Published under the terms of the Creative Commons Attribution 4.0 International license. Funded by SCOAP3.

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Contributing Institute(s):

1. FAIR Forschung NRW (FFN)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)

Experiment(s):

1. External experiment at external facility/ no experiment at GSI (other)

Appears in the scientific report 2022

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Agostini, M. ; Altenmüller, K. ; Appel, S. ; et al
Correlated and Integrated Directionality for sub-MeV solar neutrinos in Borexino
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