Low Energy Nuclear Physics at Princeton - The Borexino Solar Neutrino Experiment

普林斯顿大学低能核物理 - Borexino 太阳中微子实验

• 批准号: 9420867
• 负责人: Frank Calaprice
• 金额: $ 438.29万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-15 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9420867&HistoricalAwards=false
• 关键词: Low; Energy; Nuclear; Physics; Princeton

9420867 Calaprice The development of a new detector for live-time measurements of low energy solar neutrinos is proposed. To achieve the required low background conditions, the detector must be located underground and be made of materials of natural radiopurity. It consists of a large ultra pure liquid scintillator operation in the Gran Sasso underground laboratory in Italy. The required purity levels are unprecedented and much of the effort of this proposal will be to develop special detector materials by powerful purification methods. This detector will be the first of its kind and will be the lowest background detector in the world. The scintillator detector proposed here, which has become known as the Borexino experiment, is designed to detect the 7Be neutrino in live mode. The expected count rate in the 100 ton fiducial volume is about 50 per day. The essential requirement of this experiment is a large unsegmented detector with uranium and thorium radiopurities of better than 0.5fg/g. A prototype detector with mass of a 4tons is currently under construction to test the purity of the scintillator an other technic aspects of the design, the initial research effort is to complete the development of the scintillator vessel and the scintillator purification system an to install these in the prototype detector. The second major effort will be to employ the test facility to study the effectiveness of purification processes. The researcher will then design the full scale Borexino experiment. ***

9420867 Calaprice 提议开发一种用于实时测量低能太阳中微子的新型探测器。 为了达到所需的低本底条件，探测器必须位于地下并由天然放射性纯度的材料制成。 它由意大利格兰萨索地下实验室的大型超纯液体闪烁器组成。 所需的纯度水平是前所未有的，该提案的大部分工作将是通过强大的纯化方法开发特殊的探测器材料。 该探测器将是同类探测器中的第一个，并且将是世界上背景最低的探测器。 这里提出的闪烁体探测器被称为 Borexino 实验，旨在以实时模式探测 7Be 中微子。 100吨基准体积中的预期计数率约为每天50个。 该实验的基本要求是大型不分段探测器，其铀和钍放射性纯度优于 0.5fg/g。 目前正在建造一个质量为 4 吨的原型探测器，以测试闪烁体的纯度和设计的其他技术方面，初步的研究工作是完成闪烁体容器和闪烁体净化系统的开发，并将其安装在原型探测器中。 第二项主要工作将是利用测试设施来研究净化过程的有效性。 研究人员随后将设计全尺寸的 Borexino 实验。 ***