The Hyper-Kamiokande Experiment
The Hyper-Kamiokande Experiment
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DOI：
10.22323/1.174.0381
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发表时间：
2013-08
期刊：
影响因子：
--
通讯作者：
H. Sekiya
中科院分区：
文献类型：
--
作者：
H. Sekiya
Hyper-Kamiokande(Hyper-K)实验[1]被提出作为下一代地下水切伦科夫探测器。它将作为升级后的J-PARC设想的长基线中微子振荡实验的FAR探测器，并作为一个能够观测质子衰变、大气中微子和来自天文起源的中微子的探测器--远远超过Super-Kamiokande(Super-K)探测器的灵敏度。Hyper-K的基线设计基于非常成功的Super-K，充分利用了一项经过充分验证的技术。在这次会议中，我们重点讨论了CP相δ的势能和质量等级的确定。对于由0.75mW J-PARC质子同步加速器产生的2.5度离轴中微子束，总暴露时间为10年(一年相当于107秒)，对于所有可能的δ值，CP相σ可以被确定为好于18度，并且在已知质量等级的情况下，对于δ参数空间的74%，CP破坏可以被建立为统计意义3。此外，大气中微子的高统计数据样本将使我们能够提取关于θ23的质量等级和八分星的信息。对于整整10年的数据采集，如果SIN2σ23和θ；0.4时，对于质量等级确定的意义预计将达到3 GMT或更大。
The Hyper-Kamiokande (Hyper-K) experiment [1] is proposed as a next generation underground water Cherenkov detector. It will serve as a far detector of a long baseline neutrino oscillation experiment envisioned for the upgraded J-PARC, and as a detector capable of observing – far beyond the sensitivity of the Super-Kamiokande (Super-K) detector – proton decays, atmospheric neutrinos, and neutrinos from astronomical origins. The baseline design of Hyper-K is based on the highly successful Super-K, taking full advantage of a well-proven technology. In this conference, we focus on the potentials of the CP phase δ and the mass hierarchy determination. With a total exposure of 10 years (one year being equal to 107 sec) to a 2.5-degree off-axis neutrino beam produced by the 0.75 MW J-PARC proton synchrotron, it is expected that the CP phase δ can be determined to better than 18 degrees for all possible values of δ and CP violation can be established with a statistical significance of 3σ for 74% of the δ parameter space if the mass hierarchy is known. In addition, a high statistics data sample of atmospheric neutrinos will allow us to extract the information on the mass hierarchy and the octant of θ23. With a full 10 year duration of data taking, the significance for the mass hierarchy determination is expected to reach 3σ or greater if sin2 θ23 > 0.4.