학술논문
Improved measurement of solar neutrinos from the Carbon-Nitrogen-Oxygen cycle by Borexino and its implications for the Standard Solar Model
Document Type
Working Paper
Author
Appel, S.; Bagdasarian, Z.; Basilico, D.; Bellini, G.; Benziger, J.; Biondi, R.; Caccianiga, B.; Calaprice, F.; Caminata, A.; Cavalcante, P.; Chepurnov, A.; D'Angelo, D.; Derbin, A.; Di Giacinto, A.; Di Marcello, V.; Ding, X. F.; Di Ludovico, A.; Di Noto, L.; Drachnev, I.; Franco, D.; Galbiati, C.; Ghiano, C.; Giammarchi, M.; Goretti, A.; Göttel, A. S.; Gromov, M.; Guffanti, D.; Ianni, Aldo; Ianni, Andrea; Jany, A.; Kobychev, V.; Korga, G.; Kumaran, S.; Laubenstein, M.; Litvinovich, E.; Lombardi, P.; Lomskaya, I.; Ludhova, L.; Lukyanchenko, G.; Machulin, I.; Martyn, J.; Meroni, E.; Miramonti, L.; Misiaszek, M.; Muratova, V.; 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.; Rossi, N.; Schönert, S.; Semenov, D.; Settanta, G.; Skorokhvatov, M.; Singhal, A.; Smirnov, O.; Sotnikov, A.; Tartaglia, R.; Testera, G.; Unzhakov, E.; Villante, F. L.; Vishneva, A.; Vogelaar, R. B.; von Feilitzsch, F.; Wojcik, M.; Wurm, M.; Zavatarelli, S.; Zuber, K.; Zuzel, G.
Source
Subject
Language
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$_{\rm CNO}$ = $6.7^{+2.0}_{-0.8}$ 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 $6.6^{+2.0}_{-0.9} \times 10^8$ 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 $N_{\rm CN}$ = $(5.78^{+1.86}_{-1.00})\times10^{-4}$ 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.
Comment: 8 pages, 6 figures
Comment: 8 pages, 6 figures