Progress in neutrino oscillation physics

中微子振荡物理学进展

• 批准号: 15204016
• 负责人: KAJITA Takaaki
• 金额: $ 22.05万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15204016/
• 关键词: Neutrino; Neutrino Oscillation

A detailed study on the front detector system at the T2K experiment was carried out. T2K is a next generation neutrino oscillation experiment. Neutrinos are generated by the J-PARC accelerator and are detected in Super-Kamiokande. The experiment will start in 2009. One of the main goals of this experiment is the search for non-zero θ_<13>, which is one of the neutrino mixing angles and is not known yet. The front detector should be able to predict the neutrino energy spectrum and neutrino flavor without oscillation. Detailed Monte Carlo study concluded that a water Cherenkov detector with about 5000 20cm-diameter photomultipliers, located about 1.8km from the neutrino production target should have a sufficiently high performance for this experiment.In addition, future possibilities with the T2K neutrino beam were studied. It was concluded that large water Cherenkov detectors located in Kamioka and in Korea should have a very high sensitivity to the measurement of the neutrino CP phase and mass hierarchy.Studies of neutrino oscillations based on atmospheric neutrino events observed in Super-Kamiokande and K2K neutrino beam events were carried out. Various new results on neutrino masses and mixing angles were obtained. All the existing results are explained within the standard neutrino oscillation frame work.

对T2K实验中的前置探测器系统进行了详细研究。 T2K是下一代中微子振荡实验。中微子由 J-PARC 加速器产生，并在 Super-Kamiokande 中被检测到。该实验将于2009年开始。该实验的主要目标之一是寻找非零θ_<13>，它是中微子混合角之一，目前尚不清楚。前置探测器应该能够在不振荡的情况下预测中微子能谱和中微子味道。详细的蒙特卡罗研究得出的结论是，距离中微子产生目标约 1.8 公里的具有约 5000 个 20 厘米直径光电倍增管的水切伦科夫探测器对于该实验应该具有足够高的性能。此外，还研究了 T2K 中微子束的未来可能性。结论是，位于神冈和韩国的大型水切伦科夫探测器对中微子CP相位和质量等级的测量应该具有非常高的灵敏度。基于超级神冈和K2K中微子束事件中观测到的大气中微子事件，开展了中微子振荡研究。获得了有关中微子质量和混合角的各种新结果。所有现有结果都在标准中微子振荡框架内进行了解释。

项目成果

Resolving neutrino mass hierarchy and CP degeneracy by two Identical detectors with different baselines

通过两个具有不同基线的相同探测器解决中微子质量等级和CP简并性

• 发表时间: 2005
• 期刊: Phys. Rev. D 72
• 作者: M.Ishitsuka;T.Kajita;H.Minakaa;H.Nunokawa
• 通讯作者: H.Nunokawa

Evidence for an oscillatory signature in atmospheric neutrino oscillation

大气中微子振荡中振荡特征的证据

• 发表时间: 2004
• 期刊: Physical Review Letters 93
• 作者: Y.Ashie;T.Ishida;Y.Yoshinari;M.Sakuda et al.
• 通讯作者: M.Sakuda et al.

T.Kobayashi: "Conventional neutrino beams at K2K and JHF"Nucl.Instrum.Meth.A. 503. 418-420 (2003)

T.Kobayashi：“K2K 和 JHF 的常规中微子束”Nucl.Instrum.Meth.A。

An Improved search for ν_μ → ν_e oscillation in a long-baseline accelerator experiment

长基线加速器实验中 ν_μ → ν_e 振荡的改进搜索

• 发表时间: 2006
• 期刊: Phys. Rev. Lett. 96
• 作者: S.Yamamoto;T.Kajita;et al.
• 通讯作者: et al.

T2K experiment

T2K实验

• 发表时间: 2005
• 期刊: Nucl, Phys.Proc.Suppl. 145
• 作者: K.Kaneyuki