Determination of the $\nu_e$ and total $^8$B solar neutrino fluxes with the Sudbury neutrino observatory phase I data set - INSPIRE

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Determination of the $\nu_e$ and total $^8$ B solar neutrino fluxes with the Sudbury neutrino observatory phase I data set

SNO

Collaboration

Oct, 2006

78 pages

Published in:

Phys.Rev.C 75 (2007) 045502

e-Print:

nucl-ex/0610020 [nucl-ex]

DOI:

10.1103/PhysRevC.75.045502

Experiments:

SNO

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Abstract: (arXiv)

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 kt-year exposure of heavy water to the solar

^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_e

flux. Under the assumption that the

^8

B spectrum is undistorted, the measurements from this phase yield a solar

\nu_e

flux of

\phi(\nu_e) = 1.76^{+0.05}_{-0.05}{(stat.)}^{+0.09}_{-0.09} {(syst.)} \times 10^{6}

cm

^{-2}

s

^{-1}

, and a non-

\nu_e

component

\phi(\nu_{\mu\tau}) = 3.41^{+0.45}_{-0.45}{(stat.)}^{+0.48}_{-0.45} {(syst.)} \times 10^{6}

cm

^{-2}

s

^{-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_e

flux is found to be

A_{e} = 7.0 \pm 4.9 \mathrm{(stat.)^{+1.3}_{-1.2}}% \mathrm{(sys.)}

, when the asymmetry in the total flux is constrained to be zero.

Note:

Complete (archival) version of SNO Phase I results. 78 pages, 46 figures, 34 tables

26.65.+t
14.60.Pq
95.85.Ry
13.15.+g
neutrino: solar
boron
neutrino electron: elastic scattering
neutrino deuteron: interaction
charged current
neutral current

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