Ultracold Neutrons at TRIUMF

TRUMF 的超冷中子

• 批准号: 386328-2013
• 负责人: Martin, Jeffery
• 金额: $ 25.86万
• 依托单位: University of Winnipeg
• 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=572938
• 关键词: Ultracold; Neutrons; TRIUMF

Ultracold neutrons (UCN) are slow moving neutrons that can be stored in material, magnetic, and gravitational bottles. Once they've been confined using such methods, their properties can be studied very carefully to search for deviations from expectations based on the standard model of particle physics. We are building a new source of UCN in Canada (at TRIUMF, Vancouver, BC) with the help of collaborators from Japan (Masuda, et al). The source is projected to provide the highest density of UCN ever produced in the world, and 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, 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 three years will involve the construction of equipment for ongoing experiments in Japan, the use of the equipment to complete initial EDM experiments in Japan, and the delivery of the EDM experiment back to TRIUMF for installation. As we learn through experiments in Japan, we will also develop new ideas for the best possible experiment at TRIUMF, and prepare the experimental area at TRIUMF. This will result in a world-leading experiment at TRIUMF.

超速中子（UCN）是缓慢移动的中子，可以存储在材料，磁性和重力瓶中。 一旦使用这种方法限制了它们，就可以非常仔细地研究其属性，以根据粒子物理的标准模型来寻找与期望的偏差。 在日本的合作者的帮助下，我们正在加拿大（Masuda等人）的帮助下，在加拿大建立了UCN的新来源。 该来源预计将提供世界上有史以来生产的UCN的最高密度，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的测量，主要是我们在这项实验上寻求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。 我们未来三年的活动将涉及在日本进行正在进行的实验的设备，使用设备来完成日本初始EDM实验以及将EDM实验交付回凯夫（Triumf）进行安装。 当我们通过日本的实验学习时，我们还将开发新的想法，以在Triumf进行最佳实验，并准备Triumf的实验区域。 这将导致在Triumf进行世界领先的实验。