Solar neutrino results in Super-Kamiokande-III

Journal Article · Tue Mar 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.052010· OSTI ID:21578163

Abe, K; Iida, T; Ikeda, M; Ishihara, C; Iyogi, K; Kameda, J; Kobayashi, K; Koshio, Y; Kozuma, Y; Miura, M; Nakayama, S; Obayashi, Y; Ogawa, H; Sekiya, H; Takeda, A; Takenaga, Y; Ueno, K; Ueshima, K; Watanabe, H; Yamada, S ^[1]

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1. Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205 (Japan)

The results of the third phase of the Super-Kamiokande solar neutrino measurement are presented and compared to the first and second phase results. With improved detector calibrations, a full detector simulation, and improved analysis methods, the systematic uncertainty on the total neutrino flux is estimated to be {+-}2.1%, which is about two thirds of the systematic uncertainty for the first phase of Super-Kamiokande. The observed {sup 8}B solar flux in the 5.0 to 20 MeV total electron energy region is 2.32{+-}0.04(stat){+-}0.05(sys)x10{sup 6} cm{sup -2} sec{sup -1} under the assumption of pure electron-flavor content, in agreement with previous measurements. A combined oscillation analysis is carried out using SK-I, II, and III data, and the results are also combined with the results of other solar neutrino experiments. The best-fit oscillation parameters are obtained to be sin{sup 2}{theta}{sub 12}=0.30{sub -0.01}{sup +0.02}(tan{sup 2}{theta}{sub 12}=0.42{sub -0.02}{sup +0.04}) and {Delta}m{sub 21}{sup 2}=6.2{sub -1.9}{sup +1.1}x10{sup -5} eV{sup 2}. Combined with KamLAND results, the best-fit oscillation parameters are found to be sin{sup 2}{theta}{sub 12}=0.31{+-}0.01(tan{sup 2}{theta}{sub 12}=0.44{+-}0.03) and {Delta}m{sub 21}{sup 2}=7.6{+-}0.2x10{sup -5} eV{sup 2}. The {sup 8}B neutrino flux obtained from global solar neutrino experiments is 5.3{+-}0.2(stat+sys)x10{sup 6} cm{sup -2} s{sup -1}, while the {sup 8}B flux becomes 5.1{+-}0.1(stat+sys)x10{sup 6} cm{sup -2} s{sup -1} by adding KamLAND results. In a three-flavor analysis combining all solar neutrino experiments, the upper limit of sin{sup 2}{theta}{sub 13} is 0.060 at 95% C.L.. After combination with KamLAND results, the upper limit of sin{sup 2}{theta}{sub 13} is found to be 0.059 at 95% C.L.

• OSTI ID: 21578163
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevD.83.052010; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BORON 8
CALIBRATION
ELECTRONS
FLAVOR MODEL
MEV RANGE
SIMULATION
SOLAR FLUX
SOLAR NEUTRINOS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON ISOTOPES
COMPOSITE MODELS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
ISOTOPES
LEPTONS
LIGHT NUCLEI
MASSLESS PARTICLES
MATHEMATICAL MODELS
MILLISECONDS LIVING RADIOISOTOPES
NEUTRINOS
NUCLEI
ODD-ODD NUCLEI
PARTICLE MODELS
QUARK MODEL
RADIATION FLUX
RADIATIONS
RADIOISOTOPES
SOLAR PARTICLES
SOLAR RADIATION
STELLAR RADIATION