TY - JOUR
T1 - Solar neutrino results from Super-Kamiokande
AU - Nakano, Yuuki
N1 - 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 - Super-Kamiokande (SK), a 50 kton water Cherenkov detector in Japan, observes 8B solar neutrinos with neutrino-electron elastic scattering. SK searches for distortions of the solar neutrino energy spectrum caused by the edge of the MSW resonance in the core of the Sun. It also searches for a day/night solar neutrino flux asymmetry induced by the matter in the Earth. The installation of new front-end electronics in 2008 marks the beginning of the 4th phase of SK (SK-IV). With the improvement of the water circulation system, calibration methods, reduction cuts, this phase achieved the lowest energy threshold thus far (3.5 MeV kinetic energy). SK observed solar neutrinos for about 19 years, that is 5,200 days. This long operation covers more than 1.5 solar activity cycles. An analysis about a possible correlation between solar neutrino flux and 11 year activity cycle will be presented. To test the matter effect induced by the Sun and the Earth, the energy spectrum and the day/night solar neutrino flux asymmetry from SK-I to SK-IV is analyzed. A global oscillation analysis using SK-I,II,III, and SK-IV data and combined with the results of other solar neutrino experiments as well as KamLAND reactor experiment has been carried out. The results of this global analysis will be presented as well.
AB - Super-Kamiokande (SK), a 50 kton water Cherenkov detector in Japan, observes 8B solar neutrinos with neutrino-electron elastic scattering. SK searches for distortions of the solar neutrino energy spectrum caused by the edge of the MSW resonance in the core of the Sun. It also searches for a day/night solar neutrino flux asymmetry induced by the matter in the Earth. The installation of new front-end electronics in 2008 marks the beginning of the 4th phase of SK (SK-IV). With the improvement of the water circulation system, calibration methods, reduction cuts, this phase achieved the lowest energy threshold thus far (3.5 MeV kinetic energy). SK observed solar neutrinos for about 19 years, that is 5,200 days. This long operation covers more than 1.5 solar activity cycles. An analysis about a possible correlation between solar neutrino flux and 11 year activity cycle will be presented. To test the matter effect induced by the Sun and the Earth, the energy spectrum and the day/night solar neutrino flux asymmetry from SK-I to SK-IV is analyzed. A global oscillation analysis using SK-I,II,III, and SK-IV data and combined with the results of other solar neutrino experiments as well as KamLAND reactor experiment has been carried out. The results of this global analysis will be presented as well.
UR - http://www.scopus.com/inward/record.url?scp=85025814644&partnerID=8YFLogxK
U2 - 10.22323/1.236.1088
DO - 10.22323/1.236.1088
M3 - 会議記事
AN - SCOPUS:85025814644
SN - 1824-8039
VL - Part F128556
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 38th International Conference on High Energy Physics, ICHEP 2016
Y2 - 3 August 2016 through 10 August 2016
ER -