Precision Measurement of the {sup 7}Be Solar Neutrino Interaction Rate in Borexino

Journal Article · Fri Sep 30 04:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.107.141302· OSTI ID:21611794

Bellini, G; Bonetti, S; Buizza Avanzini, M; Caccianiga, B; D'Angelo, D; Giammarchi, M; Lombardi, P; Ludhova, L; Meroni, E; Miramonti, L; Perasso, L; Ranucci, G; Re, A ^[1]; Benziger, J ^[2]; Bick, D ^[3]; Bonfini, G; Cavalcante, P; Gazzana, S; Ghiano, C; Ianni, Aldo ^[4]

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1. Dipartimento di Fisica, Universita degli Studi e INFN, 20133 Milano (Italy)
2. Chemical Engineering Department, Princeton University, Princeton, New Jersey 08544 (United States)
3. Institut fuer Experimentalphysik, Universitaet, 22761 Hamburg (Germany)
4. INFN Laboratori Nazionali del Gran Sasso, SS 17 bis Km 18-910, 67010 Assergi (Italy)

The rate of neutrino-electron elastic scattering interactions from 862 keV {sup 7}Be solar neutrinos in Borexino is determined to be 46.0{+-}1.5(stat){sub -1.6}{sup +1.5}(syst) counts/(day{center_dot}100 ton). This corresponds to a {nu}{sub e}-equivalent {sup 7}Be solar neutrino flux of (3.10{+-}0.15)x10{sup 9} cm{sup -2} s{sup -1} and, under the assumption of {nu}{sub e} 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 {sigma}. A global solar neutrino analysis with free fluxes determines {Phi}{sub pp}=6.06{sub -0.06}{sup +0.02}x10{sup 10} cm{sup -2} s{sup -1} and {Phi}{sub CNO}<1.3x10{sup 9} cm{sup -2} s{sup -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.

• OSTI ID: 21611794
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 107; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

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