0000000001064094

AUTHOR

Hisakazu Minakata

showing 3 related works from this author

Solar Neutrino Observables Sensitive to Matter Effects

2010

We discuss constraints on the coefficient A_{MSW} which is introduced to simulate the effect of weaker or stronger matter potential for electron neutrinos with the current and future solar neutrino data. The currently available solar neutrino data leads to a bound A_{MSW} = 1.47^{-0.42}_{+0.54} (^{-0.82}_{+1.88}) at 1\sigma (3\sigma) CL, which is consistent with the Standard Model prediction A_{MSW} = 1. For weaker matter potential (A_{MSW} 1), the bound is milder and is dominated by the day-night asymmetry of ^8B neutrino flux recently observed by Super-Kamiokande. Among the list of observable of ongoing and future solar neutrino experiments, we find that (1) an improved precision of the d…

Nuclear and High Energy PhysicsParticle physicsArticle SubjectSolar neutrinomedia_common.quotation_subjectAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciences7. Clean energy01 natural sciencesAsymmetryStandard ModelHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)0103 physical sciences010306 general physicsNeutrino oscillationBorexinomedia_commonPhysics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyFísicaSolar neutrino problemlcsh:QC1-999High Energy Physics - Phenomenology13. Climate actionMeasurements of neutrino speedHigh Energy Physics::ExperimentNeutrinolcsh:PhysicsAdvances in High Energy Physics
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Probing supernova physics with neutrino oscillations

2001

We point out that solar neutrino oscillations with large mixing angle as evidenced in current solar neutrino data have a strong impact on strategies for diagnosing collapse-driven supernova (SN) through neutrino observations. Such oscillations induce a significant deformation of the energy spectra of neutrinos, thereby allowing us to obtain otherwise inaccessible features of SN neutrino spectra. We demonstrate that one can determine temperatures and luminosities of non-electron flavor neutrinos by observing bar{nu}_{e} from galactic SN in massive water Cherenkov detectors by the charged current reactions on protons.

PhysicsNuclear and High Energy PhysicsParticle physicsPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaSolar neutrinoAstrophysics (astro-ph)High Energy Physics::PhenomenologyFísicaFOS: Physical sciencesAstrophysicsAstrophysicsSpectral lineHigh Energy Physics - PhenomenologySupernovaHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics::ExperimentNeutrinoNeutrino oscillationCharged currentMixing (physics)Cherenkov radiationPhysics Letters B
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Parameter Degeneracy in Flavor-Dependent Reconstruction of Supernova Neutrino Fluxes

2008

We reexamine the possibility of reconstructing the initial fluxes of supernova neutrinos emitted in a future core-collapse galactic supernova explosion and detected in a Megaton-sized water Cherenkov detector. A novel key element in our method is the inclusion, in addition to the total and the average energies of each neutrino species, of a "pinching" parameter characterizing the width of the distribution as a fit parameter. We uncover in this case a continuous degeneracy in the reconstructed parameters of supernova neutrino fluxes at the neutrinosphere. We analyze in detail the features of this degeneracy and show how it occurs irrespective of the parametrization used for the distribution …

PhysicsParticle physicsCherenkov detectorPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaFísicaFOS: Physical sciencesAstronomy and Astrophysicslaw.inventionSupernovaHigh Energy Physics - PhenomenologyDistribution (mathematics)Distribution functionHigh Energy Physics - Phenomenology (hep-ph)lawNeutrinoDegeneracy (mathematics)Parametrization
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