0000000000620728

AUTHOR

G. T. Ewan

showing 3 related works from this author

Direct evidence for neutrino flavor transformation from neutral-current interactions in the Sudbury Neutrino Observatory

2002

Observations of neutral current neutrino interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using the neutral current, elastic scattering, and charged current reactions and assuming the standard 8B shape, the electron-neutrino component of the 8B solar flux is 1.76 +/-0.05(stat.)+/-0.09(syst.) x10^6/(cm^2 s), for a kinetic energy threshold of 5 MeV. The non-electron neutrino component is 3.41+/-0.45(stat.)+0.48,-0.45(syst.) x10^6/(cm^2 s), 5.3 standard deviations greater than zero, providing strong evidence for solar electron neutrino flavor transformation. The total flux measured with the NC reaction is 5.09 +0.44,-0.43(stat.)+0.46,-0.43(syst.)x10^6/(cm^2 s), consi…

Particle physicsPhysics::Instrumentation and DetectorsSolar neutrinoAstrophysics::High Energy Astrophysical PhenomenaGeneral Physics and AstronomyFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)Tau neutrino0103 physical sciencesNuclear Experiment (nucl-ex)010306 general physicsNeutrino oscillationNuclear ExperimentNuclear ExperimentPhysicsSudbury Neutrino Observatory010308 nuclear & particles physicsHigh Energy Physics::PhenomenologySolar neutrino problemNeutrino detectorHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary AstrophysicsNeutrinoLepton
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Measurement of day and night neutrino energy spectra at SNO and constraints on neutrino mixing parameters

2002

The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted $^8$B spectrum, the night minus day rate is $14.0% \pm 6.3% ^{+1.5}_{-1.4}%$ of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the $\nu_e$ asymmetry is found to be $7.0% \pm 4.9% ^{+1.3}_{-1.2}%$. A global solar neutrino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution.

Astrophysics::High Energy Astrophysical PhenomenaSolar neutrinoFOS: Physical sciencesGeneral Physics and AstronomyFluxCosmic rayAstrophysics7. Clean energy01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)0103 physical sciencesNuclear astrophysicsNuclear Experiment (nucl-ex)010306 general physicsNeutrino oscillationNuclear ExperimentAstrophysics::Galaxy AstrophysicsCharged currentPhysicsSudbury Neutrino Observatory010308 nuclear & particles physicsAstrophysics (astro-ph)High Energy Physics::Phenomenology13. Climate actionHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary AstrophysicsNeutrino
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Intense mass-separated beams of halogens and beta-delayed neutron emission from heavy bromine isotopes

1984

Improved production yields of short-lived halogens were obtained from a ThO2 target, irradiated with 600 MeV protons, in combination with a negative surface ionization source. Mass-separated samples were studied by decay spectroscopy. Production yields of radioactive isotopes of chlorine, bromine, iodine and astatine are presented. Half-lives and relative neutron emission probabilities were measured for the heavy bromine isotopes89−92Br. Normalizing to earlier publishedPn values for89Br, the results are:89Br (4.30±0.14s,P n =13.6±0.8%),90Br (1.92±0.06s,P n =24.8±1.5%),91Br (0.53 ±0.03 s,P n =30.1 ±2.1%), and92Br (0.31 ±0.02 s,P n =34.6±2.5%). Energy spectra ofβ-delayed neutrons were measure…

PhysicsNuclear and High Energy PhysicsBromineNeutron emissionRadiochemistryThermal ionizationchemistry.chemical_elementchemistryIsotopes of bromineHalogenNeutronAtomic physicsSpectroscopyDelayed neutronZeitschrift f�r Physik A Atoms and Nuclei
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