6533b7d7fe1ef96bd1267b08
RESEARCH PRODUCT
Bounds on the Solar Antineutrino total Flux and Energy spectrum from the SK experiment
E. Torrente-lujansubject
PhysicsNuclear and High Energy PhysicsParticle physicsSolar neutrinoFluxFOS: Physical sciencesElectronApproxHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Inverse beta decayMagnitude (astronomy)High Energy Physics::ExperimentNeutrinoBar (unit)description
A search for inverse beta decay electron antineutrinos has been carried out using the 825 days sample of solar data obtained at SK. The absence of a significant signal, that is, contributions to the total SK background and their angular variations has set upper bounds on a) the absolute flux of solar antineutrinos originated from ${}^8 B$ neutrinos $��_{\bar��}({}^8 B)=< 1.8\times 10^5 cm^{-2} s^{-1}$ which is equivalent to an averaged conversion probability bound of P<3.5% (SSM-BP98 model) and b) their differential energy spectrum, the conversion probability is smaller than 8% for all $E_{e,vis}>6.5$ MeV going down the 5% level above $E_{e,vis}\approx 10$ MeV. It is shown that an antineutrino flux would have the net effect of enhancing the SK signal at {\em hep} neutrino energies. The magnitude of this enhancement would highly depend on the, otherwise rather uncertain, steepness of the solar neutrino spectrum at these energies.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-11-23 |