Precision Measurements with Cold and Ultracold Neutrons

使用冷和超冷中子进行精密测量

• 批准号: 1205833
• 负责人: Stefan Baessler
• 金额: $ 45.6万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1205833&HistoricalAwards=false
• 关键词: Precision; Measurements; Cold; Ultracold; Neutrons

This grant supports precision measurements with cold neutrons that serve to better understand the fundamental interactions between elementary particles. With the first sub-project, the Nab spectrometer, a precision study of neutron beta decay is planned. The spectrometer is in the construction phase, and with this grant the PI's group's efforts in magnet design, systematic studies, the construction of the main electrode system, the vacuum system, and a monoenergetic proton source are supported. The second sub-project, the npdgamma experiment, aims to better understand weak hadronic interactions. The experiment has entered the data taking phase at the cold neutron beamline FNPB of the Spallation Neutron Source. This grant supports the PI's group's contribution to magnetic field environment, data taking and data analysis.The common goal of this experimental program is to test the Standard Model in regions which were not accessible before, or at least not as precise. A discovery of something not explained in the Standard Model would also have important implications for High Energy Physics and Cosmology. The project have a valuable impact on higher education: most of the work is done by students at undergraduate and graduate level and postdocs, who earn valuable skills and experiences for their future career.

这笔赠款支持使用冷中子进行精确测量，以更好地了解基本粒子之间的基本相互作用。随着第一个子项目-NAB光谱仪的实施，计划对中子β衰变进行精确研究。光谱仪正处于建造阶段，有了这笔赠款，PI小组在磁体设计、系统研究、主电极系统、真空系统和单能质子源的建设方面的努力得到了支持。第二个子项目，npd伽马实验，旨在更好地了解弱强子相互作用。实验已进入散裂中子源冷中子束线FNPB的数据采集阶段。这笔赠款支持PI小组对磁场环境、数据获取和数据分析的贡献。该实验计划的共同目标是在以前无法访问或至少不那么精确的区域测试标准模型。标准模型中没有解释的东西的发现也将对高能物理和宇宙学产生重要影响。该项目对高等教育产生了宝贵的影响：大部分工作由本科生、研究生和博士后完成，他们为未来的职业生涯积累了宝贵的技能和经验。