TY - JOUR
T1 - Solar and atmospheric neutrino oscillations in Super-Kamiokande
AU - Koshio, Yusuke
N1 - Funding Information:
The author would like to thank the Super-Kamiokande collaboration for this work, also acknowledge the cooperation of the Kamioka Mining and Smelting Company. SK has been built and operated from funds provided by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation.
Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
PY - 2016
Y1 - 2016
N2 - The recent results of solar and atmospheric neutrino oscillations in Super-Kamiokande (SK) are presented. SK has four phases (SK-I to IV) since starting the operation in 1996. In this time update, the 2365 and 2520 days of data for SK-IV was used for solar and atmospheric neutrino analysis, respectively. In solar neutrino analysis, the lowering energy threshold (3.5MeV) has achieved in SK-IV thanks to the background reduction. More than 84,000 signals were totally observed in 5200 days through all the phases, and no long term flux time variation was seen. The night flux was 3.3% higher than day flux which caused by the neutrino oscillation of the matter effect of the earth at 3 sigma level. No significant distortion of the energy spectrum was seen. The obtained global neutrino oscillation parameters were determined as Δm221 = 7.49 × 10-5eV2 and sin2 θ12 = 0.308. In atmospheric neutrinos, 0.33 MegatonYears of data were accumulated, and the analysis were carried out. The best fit of the neutrino oscillation parameters are Δm232 = 2.5 × 10-3, sin2& theta;23 = 0.587,δCP = 4.189 for normal hierarchy case. The normal hierarchy is preferred with significance Δχ2 = χ2(NH)-χ2(IH) = -4.3. The tau neutrino appearance by atmospheric neutrino oscillation was confirmed at 4.6a level.
AB - The recent results of solar and atmospheric neutrino oscillations in Super-Kamiokande (SK) are presented. SK has four phases (SK-I to IV) since starting the operation in 1996. In this time update, the 2365 and 2520 days of data for SK-IV was used for solar and atmospheric neutrino analysis, respectively. In solar neutrino analysis, the lowering energy threshold (3.5MeV) has achieved in SK-IV thanks to the background reduction. More than 84,000 signals were totally observed in 5200 days through all the phases, and no long term flux time variation was seen. The night flux was 3.3% higher than day flux which caused by the neutrino oscillation of the matter effect of the earth at 3 sigma level. No significant distortion of the energy spectrum was seen. The obtained global neutrino oscillation parameters were determined as Δm221 = 7.49 × 10-5eV2 and sin2 θ12 = 0.308. In atmospheric neutrinos, 0.33 MegatonYears of data were accumulated, and the analysis were carried out. The best fit of the neutrino oscillation parameters are Δm232 = 2.5 × 10-3, sin2& theta;23 = 0.587,δCP = 4.189 for normal hierarchy case. The normal hierarchy is preferred with significance Δχ2 = χ2(NH)-χ2(IH) = -4.3. The tau neutrino appearance by atmospheric neutrino oscillation was confirmed at 4.6a level.
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M3 - Conference article
AN - SCOPUS:85020102298
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 001
T2 - 9th Neutrino Oscillation Workshop, NOW 2016
Y2 - 4 September 2016 through 11 September 2016
ER -