Ultracold Neutrons at TRIUMF: Bridging Grant Application for New Members

TRIUMF 的超冷中子：新成员的过渡补助金申请

• 批准号: SAPPJ-2014-00027
• 负责人: Jones, David
• 金额: $ 2.19万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=589196
• 关键词: Ultracold; Neutrons; TRIUMF; Bridging; Grant

A world-leading new source of ultracold neutrons (UCN) is being constructed in Canada (at TRIUMF, Vancouver, BC) with the help of collaborators from Japan (Masuda, et al). The UCN we produce will be used to push some very interesting physics experiments to unprecedented levels of precision. Initially we are focused on a measurement of the neutron electric dipole moment (EDM), and it is primarily our activities on this experiment for which we are seeking NSERC support. Measurements of electric dipole moments already severely limit new sources of Charge-Parity (CP) violation beyond the standard model, sources which are believed to be required in order to explain the predominance of matter over antimatter (baryon asymmetry) in the universe today. If a non-zero value were discovered at the level of experimental precision within reach of our new experiment, it could signify a new source of CP violation, and hence help to explain the baryon asymmetry of the universe. Our activities over the next two years will involve completing critical R&D on a very precise comagnetometer for the experiment. We are developing the dual-species Xe-129/Hg-199 comagnetometer. This solution has several advantages over the traditional single-species Hg-199 comagnetometer, the most important being that it offers a cross-check on the anticipated largest systematic error in the experiment. The comagnetometer R&D requires expertise in advanced laser and atomic physics techniques, offered by the three new collaborators that are requesting support via a bridging grant for two years.

在日本的合作者的帮助下，正在加拿大（Masuda等人）的帮助，在加拿大（Masuda等人的合作者）的帮助下，正在加拿大（Masuda等人）建造一个世界领先的新来源。 我们生产的UCN将用于将一些非常有趣的物理实验推向前所未有的精度。 最初，我们专注于对中子电偶极矩（EDM）的测量，这主要是我们在该实验上寻求NSERC支持的活动。 电偶极力矩的测量已经严重限制了新的电荷 - 差异来源（CP）违规的范围，而不是标准模型，这些源被认为是必需的，以解释当今宇宙中物质比反物质（Baryon不对称）的优势。 如果在我们的新实验的实验精度级别上发现了非零值，则可以表示新的CP违规来源，因此有助于解释宇宙的Baryon不对称性。 在接下来的两年中，我们的活动将涉及在实验非常精确的comagnetomer上完成关键的研发。 我们正在开发双物种XE-129/HG-199 comagnetometer。 该解决方案比传统的单物种HG-199 comagnetometer具有多个优点，最重要的是它对实验中预期的最大系统错误提供了交叉检查。 Comagnetometer研发需要高级激光和原子物理技术的专业知识，这是由三个新合作者提供的，这些合作者通过桥接赠款要求提供支持已有两年了。