Solar Neutrino Measurements in Super-Kamiokande-IV
By S. Abe, Y. Haga, Y. Hayato, M. Ikeda, K. Iyogi, J. Kameda, Y. Kishimoto, L. Marti, M. Miura, S. Moriyama and 209 more. 2016
133 citations recorded by the source corpus.
Upgraded electronics, improved water system dynamics, better calibration and analysis techniques allowed Super-Kamiokande-IV to clearly observe very low-energy 8B solar neutrino interactions, with recoil electron kinetic energies as low as 3.49 MeV. Super-Kamiokande-IV data-taking began in September of 2008; this paper includes data until February 2014, a total livetime of 1664 days. The measured solar neutrino flux is (2.308+-0.020(stat.) + 0.039-0.040(syst.)) x 106/(cm2sec) assuming no oscillations. The observed recoil electron energy spectrum is consistent with no distortions due to neutrino oscillations. An extended maximum likelihood fit to the amplitude of the expected solar zenith angle variation of the neutrino-electron elastic scattering rate in SK-IV results in a day/night asymmetry of (-3.6+-1.6(stat.)+-0.6(syst.))%. The SK-IV solar neutrino data determine the solar mixing angle as sin2 theta_12 = 0.327+0.026-0.031, all SK solar data (SK-I, SK-II, SK III and SKIV) measures this angle to be sin2 theta_12 = 0.334+0.027-0.023, the determined mass-squared splitting is Delta m2_21 = 4.8+1.5-0.8 x10-5 eV2.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/bc989a48c5a910b27d88340757af8eac45d762da
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In Nuclear and High Energy Physics
Citations in the corpus
- Neutrino Oscillations and Non-standard Interactions (2017, unknown): “Moreover, during this last period, Super–Kamiokande has reported a 3σ indication of Earth matter effects in the solar neutrino flux, with the following measured value of the day–night asymmetry [45, 46]”
- Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II (2019, unknown): “Solar neutrino experiments, primarily SNO [1] and Super-Kamiokande [2], together with KamLAND [3–5], have resolved the solar neutrino problem with the large mixing angle (LMA) MSW flavor conversion effect [6–9].”
- JUNO physics and detector (2021, background): “The world’s largest sample of 8B solar neutrinos collected at Super-K made it possible to study in detail the spectral distortion in the transition region of Pee, to constrain the neutrino oscillation parameters such as the mixing angle θ12 and the mass-squared difference ∆m(2)21, and to measure the”
- NuFit-6.0: updated global analysis of three-flavor neutrino oscillations (2024, unknown): “In the solar neutrino sector, new data included since NuFIT 5.0 are the full day-night spectrum from the phase-IV of Super-Kamiokande [45], and the final spectra from Borexino phases-II [12] and III [13].”