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Wyszukujesz frazę "Redchuk, M." wg kryterium: Autor


Tytuł:
Improved measurement of solar neutrinos from the carbon-nitrogen-oxygen cycle by Borexino and its implications for the standard solar model
Autorzy:
Vogelaar, R. B.
Miramonti, L.
Franco, D.
Drachnev, I.
Cavalcante, P.
Ianni, Andrea
Unzhakov, E.
Goretti, A.
Orekhov, V.
Lombardi, P.
Sotnikov, A.
Ranalli, M. T.
Korga, G.
Guffanti, D.
Vishneva, A.
Di Giacinto, A.
Misiaszek, Marcin
Razeto, A.
Kumaran, S.
Zuber, K.
Bagdasarian, Z.
Pallavicini, M.
Redchuk, M.
Wurm, M.
Bellini, G.
Penek, Ö.
Kobychev, V.
Nugmanov, R.
Basilico, D.
Martyn, J.
Di Ludovico, A.
Villante, F. L.
Biondi, R.
Semenov, D.
Settanta, G.
Ding, X. F.
Ortica, F.
Skorokhvatov, M.
Di Marcello, V.
Zuzel, Grzegorz
Gromov, M.
Ranucci, G.
Re, A.
Pelicci, L.
Tartaglia, R.
Caminata, A.
Caccianiga, B.
Oberauer, L.
Raikov, G.
Chepurnov, A.
Benziger, J.
Ghiano, C.
Schönert, S.
Singhal, A.
Pocar, A.
Papp, L.
von Feilitzsch, F.
Testera, G.
Zavatarelli, S.
Jany, Anna
Lomskaya, I.
Pilipenko, N.
Lukyanchenko, G.
Meroni, E.
Appel, S.
Ludhova, L.
Laubenstein, M.
Smirnov, O.
Wójcik, Marcin
Calaprice, F.
Pietrofaccia, L.
Di Noto, L.
Machulin, I.
Ianni, Aldo
Giammarchi, M.
Rossi, N.
D’Angelo, D.
Derbin, A.
Muratova, V.
Galbiati, C.
Göttel, A. S.
Litvinovich, E.
Opis:
We present an improved measurement of the carbon-nitrogen-oxygen (CNO) solar neutrino interaction rate at Earth obtained with the complete Borexino Phase-III dataset. The measured rate, $R_{CNO}=6.7_{-0.8}^{+2.0}$ counts (day $\times$ 100 tonnes), allows us to exclude the absence of the CNO signal with about 7$\sigma$ C.L. The correspondent CNO neutrino flux is $6.6_{-0.9}^{+2.0} \times 10^{8} cm^{-2}s^{-1}$, 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 $N_{CN}=(5.78_{-1.00}^{+1.86})\times 10^{-4}$ displays a ∼ 2$\sigma$ tension with the "low-metallicity" spectroscopic photospheric measurements. Furthermore, our result used together with the $^{7}Be$ and $^{8}B$ solar neutrino fluxes, also measured by Borexino, permits us to disfavor at 3.1$\sigma$ C.L. the "low-metallicity" standard solar model B16-AGSS09met as an alternative to the "high-metallicity" standard solar model B16-GS98.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun
Autorzy:
Lukyanchenko, L.
Miramonti, L.
Franco, D.
Drachnev, I.
Cavalcante, P.
Ianni, Andrea
Unzhakov, E.
Ranalli, M. T.
Goretti, A.
Orekhov, V.
Nieslony, M.
Lombardi, P.
Sotnikov, A.
Ding, X. F.
Korga, G.
Guffanti, D.
Suvorov, Y.
Vishneva, A.
Di Giacinto, A.
Neumair, B.
Misiaszek, Marcin
Razeto, A.
Kumaran, S.
Zuber, K.
Jeschke, D.
Bagdasarian, Z.
Pallavicini, M.
Atroshchenko, V.
Redchuk, M.
Wurm, M.
Bellini, G.
Romani, A.
Penek, Ö.
Kobychev, V.
Nugmanov, R.
Basilico, D.
Meyer, M.
Martyn, J.
Di Ludovico, A.
Biondi, R.
Göttel, A. S.
Semenov, D.
Settanta, G.
Ortica, F.
Formozov, A.
Skorokhvatov, M.
Di Marcello, V.
Bravo, D.
Zuzel, Grzegorz
Agostini, M.
Villante, F. L.
Gromov, M.
Ranucci, G.
Re, A.
Davini, S.
Pelicci, L.
Tartaglia, R.
Caminata, A.
Caccianiga, B.
Oberauer, L.
Raikov, G.
Vogelaar, R. B.
Chepurnov, A.
Benziger, J.
Ghiano, C.
Schönert, S.
Singhal, A.
Pocar, A.
Papp, L.
von Feilitzsch, F.
Testera, G.
Zavatarelli, S.
Jany, Anna
Lomskaya, I.
Pilipenko, N.
Lukyanchenko, G.
Meroni, E.
Appel, S.
Ludhova, L.
Altenmüller, K.
Laubenstein, M.
Smirnov, O.
Calaprice, F.
Pietrofaccia, L.
Di Noto, L.
Machulin, I.
Thurn, J.
Ianni, Aldo
Giammarchi, M.
Rossi, N.
D’Angelo, D.
Derbin, A.
Muratova, V.
Galbiati, C.
Wójcik, Marcin
Litvinovich, E.
Opis:
For most of their existence, stars are fuelled by the fusion of hydrogen into helium. Fusion proceeds via two processes that are well understood theoretically: the proton–proton (pp) chain and the carbon–nitrogen–oxygen (CNO) cycle. Neutrinos that are emitted along such fusion processes in the solar core are the only direct probe of the deep interior of the Sun. A complete spectroscopic study of neutrinos from the pp chain, which produces about 99 per cent of the solar energy, has been performed previously; however, there has been no reported experimental evidence of the CNO cycle. Here we report the direct observation, with a high statistical significance, of neutrinos produced in the CNO cycle in the Sun. This experimental evidence was obtained using the highly radiopure, large-volume, liquid-scintillator detector of Borexino, an experiment located at the underground Laboratori Nazionali del Gran Sasso in Italy. The main experimental challenge was to identify the excess signal—only a few counts per day above the background per 100 tonnes of target—that is attributed to interactions of the CNO neutrinos. Advances in the thermal stabilization of the detector over the last five years enabled us to develop a method to constrain the rate of bismuth-210 contaminating the scintillator. In the CNO cycle, the fusion of hydrogen is catalysed by carbon, nitrogen and oxygen, and so its rate—as well as the flux of emitted CNO neutrinos—depends directly on the abundance of these elements in the solar core. This result therefore paves the way towards a direct measurement of the solar metallicity using CNO neutrinos. Our findings quantify the relative contribution of CNO fusion in the Sun to be of the order of 1 per cent; however, in massive stars, this is the dominant process of energy production. This work provides experimental evidence of the primary mechanism for the stellar conversion of hydrogen into helium in the Universe.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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