Development of Water-Based Liquid Scintillator for Elementary-Particle, Nuclear and Cosmic-Ray Experimental

用于基本粒子、核和宇宙线实验的水基液体闪烁体的研制

• 批准号: 14540236
• 负责人: SUEKANE Fumihiko
• 金额: $ 2.05万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540236/
• 关键词: Elementary Particle Experiment; Nuclear Experiment; Cosmic ray; Liquid Scintillator; 素粒子; 原子核; シンチレーター; ニュートリノ検出器

The aim of this research is to develop water-based liquid scintillator to solve various issues associated with the oil based liquid scintillators. In this research, molecules which contains benzene circle are dissolved in water as well as fluors in order to obtain fluorescence when a charged particle passes through the liquid. There are two kinds of molecules which contain the benzene circle and can be dissolved in the water. One is surfactant with the benzene circle and the other is water-solvable aromatic liquid. Various kinds of such molecules were listed up and mixed in water together with fluors such as PPO and bis-MSB with various combinations of concentrations and its light output was measured using γ-rays from ^<60>Co. If a sample showed a significant light output, its light attenuation length, flash point and stability were further investigated. We could make noninflammable liquid scintillators with 82% of water content, 7.2% Anthracene of light output and 77cm of light attenuation length for 420nm wavelength light, or 81% water content, 4.0% Anthracene of light output and 220cm of light attenuation length, by dissolving surfactant and fluors in water. These light outputs are high enough for nuclear experiments and elementary particle experiments which deal with high ionizing particles. On the other hand it turned out these liquid scintillators show aging properties after 8months equivalent period in acceleration tests. This is still a remaining issue. A neutrino experiment is being designed in which this water-based liquid scintillator is one of the candidates to be used.

Thelop水基液体的目的是与油性较高的液体闪烁体相结合的Varios Sorios。通过液体，含有苯圆的耐受性可以溶解在苯圆的水中，而另一个则是可溶解的芳族液体。如果样品显示出明显的光输出，则使用ys ys进行测量，请进一步研究闪光灯，闪点和稳定性。水含量为4.0％的光线和220厘米的光疗法，将表面活性剂和荧光液溶解在水中。

项目成果

F.Suekane, K.Inoue, T.Araki, K.Jongok: "Precise Measurement of sin^2 2theta813) using Japanese Reactors"Proceedings of 4th workshop on Neurtrino Oscillation and their origin. hep-esx/0306029. (2003)

F.Suekane、K.Inoue、T.Araki、K.Jongok：“使用日本反应堆精确测量 sin^2 2theta813)”第四届中微子振荡及其起源研讨会论文集。

F.Suekane, K.Inoue, T.Araki, Kim Jongok: "Precise Measurement of sin^2 2theta(13) using Japanese Reactors"Proceedings of 4th Workshop on Neutrino Oscillation and their Origin. hep-ex/0306029. (2003)

F.Suekane、K.Inoue、T.Araki、Kim Jongok：“使用日本反应堆精确测量 sin^2 2theta(13)”第四届中微子振荡及其起源研讨会论文集。

Anderson et al.: "White paper report on using nuclear reactors to search for a value of theta(13)"hep-ex/0402041. (2004)

Anderson 等人：“关于使用核反应堆寻找 theta(13) 值的白皮书报告”hep-ex/0402041。