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27 April 2024

» arxiv » 2205.15975

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Improved measurement of solar neutrinos from the Carbon-Nitrogen-Oxygen cycle by Borexino and its implications for the Standard Solar Model
S. Appel ; Z. Bagdasarian ; D. Basilico ; G. Bellini ; J. Benziger ; R. Biondi ; B. Caccianiga ; F. Calaprice ; A. Caminata ; P. Cavalcante ; A. Chepurnov ; D. D'Angelo ; A. Derbin ; A. Di Giacinto ; V. Di Marcello ; X.F. Ding ; A. Di Ludovico ; L. Di Noto ; I. Drachnev ; D. Franco ; C. Galbiati ; C. Ghiano ; M. Giammarchi ; A. Goretti ; A.S. Göttel ; M. Gromov ; D. Guffanti ; Aldo Ianni ; Andrea Ianni ; A. Jany ; V. Kobychev ; G. Korga ; S. Kumaran ; M. Laubenstein ; E. Litvinovich ; P. Lombardi ; I. Lomskaya ; L. Ludhova ; G. Lukyanchenko ; I. Machulin ; J. Martyn ; E. Meroni ; L. Miramonti ; M. Misiaszek ; V. Muratova ; R. Nugmanov ; L. Oberauer ; V. Orekhov ; F. Ortica ; M. Pallavicini ; L. Papp ; L. Pelicci ; Ö. Penek ; L. Pietrofaccia ; N. Pilipenko ; A. Pocar ; G. Raikov ; M.T. Ranalli ; G. Ranucci ; A. Razeto ; A. Re ; M. Redchuk ; N. Rossi ; S. Schönert ; D. Semenov ; G. Settanta ; M. Skorokhvatov ; A. Singhal ; O. Smirnov ; A. Sotnikov ; R. Tartaglia ; G. Testera ; E. Unzhakov ; F.L. Villante ; A. Vishneva ; R.B. Vogelaar ; F. von Feilitzsch ; M. Wojcik ; M. Wurm ; S. Zavatarelli ; K. Zuber ; G. Zuzel ;
Date:	31 May 2022
Abstract:	We present an improved measurement of the CNO solar neutrino interaction rate at Earth obtained with the complete Borexino Phase-III dataset. The measured rate R$_{ m CNO}$ = $6.7^{+2.0}_{-0.8}$ counts/(day$ cdot$ 100 tonnes), allows us to exclude the absence of the CNO signal with about 7$sigma$ C.L. The correspondent CNO neutrino flux is $6.6^{+2.0}_{-0.9} imes 10^8$ 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 $N_{ m CN}$ = $(5.78^{+1.86}_{-1.00}) imes10^{-4}$ displays a $sim$2$sigma$ tension with the "low metallicity" spectroscopic photospheric measurements. On the other hand, our result used together with the $^7$Be and $^8$B solar neutrino fluxes, also measured by Borexino, permits to disfavour at 3.1$sigma$ C.L. the "low metallicity" SSM B16-AGSS09met as an alternative to the "high metallicity" SSM B16-GS98.
Source:	arXiv, 2205.15975
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