Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory

2001/06/30 by SNO Collaboration, Rushdy Ahmad, R. C. Allen +98 · 99 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevlett.87.071301

published as Phys.Rev.Lett.87:071301,2001 · 6 pages (LaTex), 3 figures, submitted to Phys. Rev. Letters

arxiv created 2001/06/30 · openalex publication_date 2001/07/25 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29

Abstract

Solar neutrinos from the decay of ⁸B have been detected at the Sudbury Neutrino Observatory (SNO) via the charged current (CC) reaction on deuterium and by the elastic scattering (ES) of electrons. The CC reaction is sensitive exclusively to nu_e's, while the ES reaction also has a small sensitivity to nu_mu's and nu_tau's. The flux of nu_e's from ⁸B decay measured by the CC reaction rate is ϕ^CC(nu_e) = 1.75 +/- 0.07 (stat)+0.12/-0.11 (sys.) +/- 0.05(theor) x 10⁶ /cm² s. Assuming no flavor transformation, the flux inferred from the ES reaction rate is ϕ^ES(nu_x) = 2.39+/-0.34 (stat.)+0.16/-0.14 (sys) x 10⁶ /cm² s. Comparison of ϕ^CC(nu_e) to the Super-Kamiokande Collaboration's precision value of ϕ^ES(ν_x) yields a 3.3 sigma difference, providing evidence that there is a non-electron flavor active neutrino component in the solar flux. The total flux of active ⁸B neutrinos is thus determined to be 5.44 +/-0.99 x 10⁶/cm² s, in close agreement with the predictions of solar models.

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