Solar results from Super-Kamiokande
Solar results from Super-Kamiokande
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DOI：
10.1063/1.4915566
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发表时间：
2015-07
期刊：
影响因子：
--
通讯作者：
Y. Koshio
中科院分区：
文献类型：
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作者：
Y. Koshio
本文介绍了最近在超级神冈（SK）上进行的太阳中微子测量的结果。自1996年开始运营以来，SK有四个阶段（SK-I至IV）。由于本底的降低，SK-Ⅳ实现了较低的能量阈值（3.5MeV）。将所有阶段的4504天数据合并进行分析。共观测到7万多个太阳中微子信号，没有观测到长期的通量随时间的变化。夜间通量比白天通量高3-4%，这是地球物质效应中微子振荡在3 σ水平上的首次表现。未观察到能谱的显著失真。利用SK数据进行了中微子振荡的精确分析，并对太阳和KamLAND反应堆数据进行了全局分析。测得中微子振荡参数为Δm212=7.50×10− 5eV 2，sin 2 θ12 = 0.308。自1996年开始运营以来，SK有四个阶段（SK-I至IV）。由于本底的降低，SK-Ⅳ实现了较低的能量阈值（3.5MeV）。将所有阶段的4504天数据合并进行分析。共观测到7万多个太阳中微子信号，没有观测到长期的通量随时间的变化。夜间通量比白天通量高3-4%，这是地球物质效应中微子振荡在3 σ水平上的首次表现。未观察到能谱的显著失真。利用SK数据进行了中微子振荡的精确分析，并对太阳和KamLAND反应堆数据进行了全局分析。得到的中微子整体振荡参数为Δm212=7.50×10−5 eV 2和sin 2 θ12 = 0.308。
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.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.