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First Directional Measurement of sub-MeV Solar Neutrinos with Borexino

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arxiv 2112.11816 v1 pith:GFEPI33P submitted 2021-12-22 hep-ex physics.ins-det

First Directional Measurement of sub-MeV Solar Neutrinos with Borexino

M. Agostini , K. Altenm\"uller , S. Appel , V. Atroshchenko , Z. Bagdasarian , D. Basilico , G. Bellini , J. Benziger
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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. G\"ottel 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. Pellicci \"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. Sch\"onert 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 A. Wessel M. Wojcik B. Wonsak M. Wurm S. Zavatarelli K. Zuber G. Zuzel
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classification hep-ex physics.ins-det
keywords solarmeasurementneutrinosborexinocherenkovsub-mevconfidencedetector
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 MeV to 0.74 MeV, selected using the dominant scintillation light, we have measured 10887$^{+2386}_{-2103} (\mathrm{stat.})\pm 947 (\mathrm{syst.})$ ($68\%$ confidence interval) solar neutrinos out of 19904 total events. This corresponds to a $^{7}$Be neutrino interaction rate of 51.6$^{+13.9}_{-12.5}$ counts/(day$\cdot$ 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 $>$5$\sigma$ 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.

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