Solar results from Super-Kamiokande

Yusuke Koshio

doi:10.1063/1.4915566

Solar results from Super-Kamiokande

Yusuke Koshio

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Citations (Scopus)

Abstract

The recent results of solar neutrino measurement from the Super-Kamiokande (SK) are presented. SK has four phases (SK-I to IV) since starting the operation in 1996. Thanks to the background reduction, the lowering energy threshold (3.5MeV) has achieved in SK-IV. The 4504 days of data of all the phases were combined for the analysis. More than 70,000 solar neutrino signal were totally observed, and no long term flux time variation was seen. The night flux was 3-4% higher than day flux, and it was the first indication of the neutrino oscillation of the matter effect of the earth at 3 sigma level. No significant distortion of the energy spectrum was seen. The precise neutrino oscillation analysis using SK data and the global analysis of solar and KamLAND reactor data were carried out. The obtained global neutrino oscillation parameters were determined as Δm212=7.50×10-5 eV2 and sin² θ₁₂ = 0.308.

Original language	English
Title of host publication	XXVI International Conference on Neutrino Physics and Astrophysics, Neutrino 2014
Publisher	American Institute of Physics Inc.
Volume	1666
ISBN (Electronic)	9780735413139
DOIs	https://doi.org/10.1063/1.4915566
Publication status	Published - Jul 15 2015
Event	26th International Conference on Neutrino Physics and Astrophysics, Neutrino 2014 - Boston, United States Duration: Jun 2 2014 → Jun 7 2014

Other

Other	26th International Conference on Neutrino Physics and Astrophysics, Neutrino 2014
Country	United States
City	Boston
Period	6/2/14 → 6/7/14

Keywords

Neutrino oscillation
Solar neutrino
Water cherenkov detector

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.4915566

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title = "Solar results from Super-Kamiokande",

abstract = "The recent results of solar neutrino measurement from the Super-Kamiokande (SK) are presented. SK has four phases (SK-I to IV) since starting the operation in 1996. Thanks to the background reduction, the lowering energy threshold (3.5MeV) has achieved in SK-IV. The 4504 days of data of all the phases were combined for the analysis. More than 70,000 solar neutrino signal were totally observed, and no long term flux time variation was seen. The night flux was 3-4% higher than day flux, and it was the first indication of the neutrino oscillation of the matter effect of the earth at 3 sigma level. No significant distortion of the energy spectrum was seen. The precise neutrino oscillation analysis using SK data and the global analysis of solar and KamLAND reactor data were carried out. The obtained global neutrino oscillation parameters were determined as Δm212=7.50×10-5 eV2 and sin2 θ12 = 0.308.",

keywords = "Neutrino oscillation, Solar neutrino, Water cherenkov detector",

author = "Yusuke Koshio",

year = "2015",

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day = "15",

doi = "10.1063/1.4915566",

language = "English",

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booktitle = "XXVI International Conference on Neutrino Physics and Astrophysics, Neutrino 2014",

publisher = "American Institute of Physics Inc.",

note = "26th International Conference on Neutrino Physics and Astrophysics, Neutrino 2014 ; Conference date: 02-06-2014 Through 07-06-2014",

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TY - GEN

T1 - Solar results from Super-Kamiokande

AU - Koshio, Yusuke

PY - 2015/7/15

Y1 - 2015/7/15

N2 - The recent results of solar neutrino measurement from the Super-Kamiokande (SK) are presented. SK has four phases (SK-I to IV) since starting the operation in 1996. Thanks to the background reduction, the lowering energy threshold (3.5MeV) has achieved in SK-IV. The 4504 days of data of all the phases were combined for the analysis. More than 70,000 solar neutrino signal were totally observed, and no long term flux time variation was seen. The night flux was 3-4% higher than day flux, and it was the first indication of the neutrino oscillation of the matter effect of the earth at 3 sigma level. No significant distortion of the energy spectrum was seen. The precise neutrino oscillation analysis using SK data and the global analysis of solar and KamLAND reactor data were carried out. The obtained global neutrino oscillation parameters were determined as Δm212=7.50×10-5 eV2 and sin2 θ12 = 0.308.

AB - The recent results of solar neutrino measurement from the Super-Kamiokande (SK) are presented. SK has four phases (SK-I to IV) since starting the operation in 1996. Thanks to the background reduction, the lowering energy threshold (3.5MeV) has achieved in SK-IV. The 4504 days of data of all the phases were combined for the analysis. More than 70,000 solar neutrino signal were totally observed, and no long term flux time variation was seen. The night flux was 3-4% higher than day flux, and it was the first indication of the neutrino oscillation of the matter effect of the earth at 3 sigma level. No significant distortion of the energy spectrum was seen. The precise neutrino oscillation analysis using SK data and the global analysis of solar and KamLAND reactor data were carried out. The obtained global neutrino oscillation parameters were determined as Δm212=7.50×10-5 eV2 and sin2 θ12 = 0.308.

KW - Neutrino oscillation

KW - Solar neutrino

KW - Water cherenkov detector

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U2 - 10.1063/1.4915566

DO - 10.1063/1.4915566

M3 - Conference contribution

AN - SCOPUS:85006198793

VL - 1666

BT - XXVI International Conference on Neutrino Physics and Astrophysics, Neutrino 2014

PB - American Institute of Physics Inc.

T2 - 26th International Conference on Neutrino Physics and Astrophysics, Neutrino 2014

Y2 - 2 June 2014 through 7 June 2014

ER -

Solar results from Super-Kamiokande

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Keywords

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