The rate of neutrino-electron elastic scattering interactions from 862 keV 7Be solar neutrinos in Borexino is determined to be 46.0±1.5(stat)-1.6+1.5(syst) counts/(day·100 ton). This corresponds to a νe-equivalent 7Be solar neutrino flux of (3.10±0.15)×109 cm-2 s-1 and, under the assumption of νe transition to other active neutrino flavours, yields an electron neutrino survival probability of 0.51±0.07 at 862 keV. The no flavor change hypothesis is ruled out at 5.0 σ. A global solar neutrino analysis with free fluxes determines Φpp=6.06-0.06+0.02×1010 cm-2 s-1 and ΦCNO<1.3×109 cm-2 s-1 (95% C.L.). These results significantly improve the precision with which the Mikheyev-Smirnov-Wolfenstein large mixing angle neutrino oscillation model is experimentally tested at low energy.
Precision measurement of the 7Be solar neutrino interaction rate in Borexino / G. Bellini, J. Benziger, S. Bonetti, M. Buizza Avanzini, B. Caccianiga, L. Cadonati, F. Calaprice, C. Carraro, A. Chavarria, A. Chepurnov, D. D'Angelo, S. Davini, A. Derbin, A. Etenko, K. Fomenko, D. Franco, C. Galbiati, S. Gazzana, C. Ghiano, M. Giammarchi, M. Goeger-Neff, A. Goretti, E. Guardincerri, S. Hardy, Aldo Ianni, Andrea Ianni, M. Joyce, V.V. Kobychev, D. Korablev, Y. Koshio, G. Korga, D. Kryn, M. Laubenstein, T. Lewke, E. Litvinovich, B. Loer, P. Lombardi, L. Ludhova, I. Machulin, S. Manecki, W. Maneschg, G. Manuzio, Q. Meindl, E. Meroni, L. Miramonti, M. Misiaszek, D. Montanari, V. Muratova, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, L. Perasso, S. Perasso, A. Pocar, R.S. Raghavan, G. Ranucci, A. Razeto, A.C. Re, P. Risso, A. Romani, D. Rountree, A. Sabelnikov, R. Saldanha, C. Salvo, S. Schönert, H. Simgen, M. Skorokhvatov, O. Smirnov, A. Sotnikov, S. Sukhotin, Y. Suvorov, R. Tartaglia, G. Testera, D. Vignaud, R.B. Vogelaar, F. von Feilitzsch, J. Winter, M. Wojcik, A. Wright, M. Wurm, J. Xu, O. Zaimidoroga, S. Zavatarelli, G. Zuzel. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 107:14(2011 Sep), pp. 141302.141302.1-141302.141302.5. [10.1103/PhysRevLett.107.141302]
Precision measurement of the 7Be solar neutrino interaction rate in Borexino
G. BelliniPrimo
;M. Buizza Avanzini;B. Caccianiga;D. D'Angelo;E. Meroni;L. Miramonti;A.C. Re;
2011
Abstract
The rate of neutrino-electron elastic scattering interactions from 862 keV 7Be solar neutrinos in Borexino is determined to be 46.0±1.5(stat)-1.6+1.5(syst) counts/(day·100 ton). This corresponds to a νe-equivalent 7Be solar neutrino flux of (3.10±0.15)×109 cm-2 s-1 and, under the assumption of νe transition to other active neutrino flavours, yields an electron neutrino survival probability of 0.51±0.07 at 862 keV. The no flavor change hypothesis is ruled out at 5.0 σ. A global solar neutrino analysis with free fluxes determines Φpp=6.06-0.06+0.02×1010 cm-2 s-1 and ΦCNO<1.3×109 cm-2 s-1 (95% C.L.). These results significantly improve the precision with which the Mikheyev-Smirnov-Wolfenstein large mixing angle neutrino oscillation model is experimentally tested at low energy.
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