@article{6b66bbe6b9bd49e284efa38d667f8b52,
title = "Solar neutrino measurements in Super-Kamiokande-IV",
abstract = "Upgraded electronics, improved water system dynamics, better calibration and analysis techniques allowed Super-Kamiokande-IV to clearly observe very low-energy B8 solar neutrino interactions, with recoil electron kinetic energies as low as ∼3.5 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)-0.040+0.039(syst))×106/(cm2 sec) 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 sin2θ12=0.327-0.031+0.026, all SK solar data (SK-I, SK-II, SK III and SK-IV) measures this angle to be sin2θ12=0.334-0.023+0.027, the determined mass-squared splitting is Δm212=4.8-0.8+1.5×10-5 eV2.",
author = "{Super-Kamiokande Collaboration} and K. Abe and Y. Haga and Y. Hayato and M. Ikeda and K. Iyogi and J. Kameda and Y. Kishimoto and Ll Marti and M. Miura and S. Moriyama and M. Nakahata and T. Nakajima and S. Nakayama and A. Orii and H. Sekiya and M. Shiozawa and Y. Sonoda and A. Takeda and H. Tanaka and Y. Takenaga and S. Tasaka and T. Tomura and K. Ueno and T. Yokozawa and R. Akutsu and T. Irvine and H. Kaji and T. Kajita and I. Kametani and K. Kaneyuki and Lee, {K. P.} and Y. Nishimura and T. McLachlan and K. Okumura and E. Richard and L. Labarga and P. Fernandez and Blaszczyk, {F. D.M.} and J. Gustafson and C. Kachulis and E. Kearns and Raaf, {J. L.} and Stone, {J. L.} and Sulak, {L. R.} and S. Berkman and S. Tobayama and M. Goldhaber and K. Bays and G. Carminati and Griskevich, {N. J.}",
note = "Funding Information: The authors gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. Super-K 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. This work was partially supported by the Research Foundation of Korea (BK21 and KNRC), the Korean Ministry of Science and Technology, the National Research Foundation of Korea (NRF-20110024009), the National Science Foundation of China (Grant No. 11235006), the European Union H2020 RISE-GA641540-SKPLUS, and the National Science Centre, Poland (2015/17/N/ST2/04064, 2015/18/E/ST200758). Publisher Copyright: {\textcopyright} 2016 American Physical Society.",
year = "2016",
month = sep,
day = "20",
doi = "10.1103/PhysRevD.94.052010",
language = "English",
volume = "94",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "5",
}