RECENT SNO RESULTS.

Conference · Tue Dec 10 04:00:00 EST 2002

OSTI ID:809654

YEH, M ^[1]

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1. BROOKHAVEN NATIONAL LABORATORY

Solar Neutrinos from the decay of {sup 8}B have been detected at the Sudbury Neutrino Observatory (SNO) by charged current (CC) and neutral current (NC) interactions on deuterium and elastic scattering (ES) of electrons. The SNO data indicate that with the assumption of undistorted {sup 8}B shape, the flux for v{sub e} is {phi}{sub e} = 1.76{sub -0.05}{sup +0.05}(stat.){sub -0.09}{sup +0.09}(syst.) x 10{sup 6} cm{sup -2} s{sup -1} for a kinetic energy threshold of 5 MeV. The non-v{sub e} flux is {phi}{sub {mu}{tau}} = 3.41{sub -0.45}{sup +0.45}(stat.){sub -0.45}{sup +0.48}(syst.) x 10{sup 6} cm{sup -2}s{sup -1}. This provides strong evidence for solar v{sub e} flavor transformation. The day and night solar neutrino energy spectra and rates have also been measured. For CC events, the v{sub e} asymmetry is 14.0% {+-} 6.3%{sub -1.4}{sup +1.5}%. By additionally constraining the total (NC) flux of active neutrinos to have no asymmetry, the v{sub e} asymmetry becomes 7.0% {+-} 4.9%{sub -1.2}{sup +1.3}%. A global solar neutrino analysis strongly favors the Large Mixing Angle (LMA) solution in a two-flavor neutrino oscillation model.

• Research Organization: Brookhaven National Lab., Upton, NY (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 809654
• Report Number(s): BNL--71097-2003-CP; KB0401022
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CHARGED CURRENTS
DECAY
DEUTERIUM
ELASTIC SCATTERING
ELECTRONS
ENERGY SPECTRA
KINETIC ENERGY
NEUTRAL CURRENTS
NEUTRINO OSCILLATION
NEUTRINOS
SHAPE
SOLAR NEUTRINOS
SUDBURY NEUTRINO OBSERVATORY