Determination of the {nu}{sub e} and total {sup 8}B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Journal Article · Sun Apr 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.045502· OSTI ID:20995235

Aharmim, B; Bigu, J; Cowan, J H. M.; Farine, J; Fleurot, F; Hallman, E D; Haq, R U; Hewett, J; Hykaway, J G; Krueger, A; Luoma, S; Roberge, A; Saettler, E; Schwendener, M H; Tafirout, R; Virtue, C J ^[1]; Ahmad, Q R; Bullard, T V; Burritt, T H; Cox, G A ^[2]

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1. Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6 (Canada)
2. Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, Washington 98195 (United States)

This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kiloton-year exposure of {sup 2}H{sub 2}O (in the following denoted as D{sub 2}O) to the solar {sup 8}B neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the {nu}{sub e} flux. Under the assumption that the {sup 8}B spectrum is undistorted, the measurements from this phase yield a solar {nu}{sub e} flux of {phi}({nu}{sub e})=1.76{sub -0.05}{sup +0.05}(stat.){sub -0.09}{sup +0.09}(syst.)x10{sup 6} cm{sup -2} s{sup -1} and a non-{nu}{sub e} component of {phi}({nu}{sub {mu}}{sub {tau}})=3.41{sub -0.45}{sup +0.45}(stat.){sub -0.45}{sup +0.48}(syst.)x10{sup 6} cm{sup -2} s{sup -1}. The sum of these components provides a total flux in excellent agreement with the predictions of standard solar models. The day-night asymmetry in the {nu}{sub e} flux is found to be A{sub e}=7.0{+-}4.9(stat.){sub -1.2}{sup +1.3}%(syst.), when the asymmetry in the total flux is constrained to be zero.

• OSTI ID: 20995235
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BORON 8
ELECTRON NEUTRINOS
HEAVY WATER
NEUTRINO REACTIONS
SOLAR NEUTRINOS
STAR MODELS
SUDBURY NEUTRINO OBSERVATORY