Search results for "Electron energy spectrum"

showing 2 items of 2 documents

Size of the dark side of the solar neutrino parameter space

2000

We present an analysis of the MSW neutrino oscillation solutions of the solar neutrino problem in the framework of two-neutrino mixing in the enlarged parameter space $(\ensuremath{\Delta}{m}^{2},{\mathrm{tan}}^{2}\ensuremath{\theta})$ with $\ensuremath{\theta}\ensuremath{\in}(0,\ensuremath{\pi}/2).$ Recently, it was pointed out that the allowed region of parameters from a fit to the measured total rates can extend to values $\ensuremath{\theta}g~\ensuremath{\pi}/4$ (the so-called ``dark side'') when higher confidence levels are allowed. The purpose of this Rapid Communication is to reanalyze the problem, including all the solar neutrino data available, to discuss the dependence on the stat…

Nuclear and High Energy PhysicsParticle physicsAstrofísica nuclearElectron energy spectrumSolar neutrinoSolar neutrinosOctant (solid geometry)Parameter spaceEarth-Internal structurePartícules (Física nuclear)Nuclear physicsNeutrins solarsCollisions (Nuclear physics)Resonance oscillationNeutrino oscillationZenithParticles (Nuclear physics)PhysicsHigh Energy Physics::PhenomenologyFísicaSolar neutrino problemEstructura interna de la terraCol·lisions (Física nuclear)High Energy Physics::ExperimentNuclear astrophysics
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Improved limit on the electron-antineutrino rest mass from tritium ß-decay

1993

Abstract The endpoint region of the β-spectrum of tritium was remeasured by an electrostatic spectrometer with magnetic guiding field. It enabled the search for a rest mass of the electron-antineutrino with improved precision. The result is m2v=−39±34stat±15syst(eV/c2)2, from which an upper limit of mv m( T )−m( 3 He )=18 591±3 eV /c 2 .

Nuclear physicsPhysicsNuclear and High Energy PhysicsField (physics)SpectrometerElectron energy spectrumTritiumInvariant massddc:530Limit (mathematics)Atomic physicsElectron neutrino
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