Ultracold Neutron Electric Dipole Moment Experiment

超冷中子电偶极矩实验

• 批准号: SAPPJ-2019-00031
• 负责人: Martin, Jeffery
• 金额: $ 40.07万
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762533
• 关键词: Ultracold; Neutron; Electric; Dipole; Moment

Our experiment aims to measure the neutron electric dipole moment (nEDM) more precisely than ever before. A new measurement of the nEDM will place even tighter constraints on theories involving new sources of Charge-Parity (CP) violation beyond the standard model. It is believed these are required in order to explain the predominance of matter over antimatter (baryon asymmetry) in the universe today. Quite generically, the experiment will constrain broad classes of new physics scenarios which do not conserve CP. A new measurement also could impact a long-standing mystery in the standard model, involving the appararent lack of CP violation arising from the strong force. A discovery of a non-zero nEDM would be a major discovery, because it would shed light on a broad range of theories. A key tool in this search is a new source of ultracold neutrons (UCN). 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. Our scientific collaboration is named the TUCAN (TRIUMF Ultracold Advanced Neutron) collaboration. In the past three years, we have completed a new source of UCN in Canada (at TRIUMF, Vancouver, BC) with the help of collaborators from Japan. New funds for upgrades to the UCN source and for the construction of a new neutron EDM experiment have been secured from the Canada Foundation for Innovation and partner contributions including a substantial contribution from Japan. Once the upgrades are complete, the source is projected to provide the highest density of UCN in the world. The source will be used to advance fundamental physics experiments to unprecedented levels of precision. Our activities over the next three years will involve the completion of the UCN source upgrade and the nEDM experiment construction. We will also use the existing UCN source at TRIUMF for experiments aimed at answering critical questions for the overall success of the experiment.

我们的实验旨在比以往任何时候都更精确地测量中子电偶极矩（NEDM）。对NEDM的新测量将对涉及新的电荷范围（CP）违规来源的理论更加严格，超出了标准模型。据信这些是为了解释当今宇宙中物质而不是反物质（Baryon不对称）的优势。一般而言，该实验将限制不保留CP的新物理场景的广泛类别。在标准模型中，新的测量还可能影响长期存在的谜团，涉及强大力量引起的明显缺乏CP违规。非零NEDM的发现将是一个重大发现，因为它会阐明广泛的理论。此搜索中的一个关键工具是超低中子（UCN）的新来源。 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。我们的科学合作被任命为Tucan（Triumf Ultracold Advanced Neutron）合作。在过去的三年中，我们在日本的合作者的帮助下，在加拿大（在不列颠哥伦比亚省温哥华，泰利姆夫）完成了新的UCN来源。从加拿大创新基金会获得了新的升级资金，用于升级到UCN来源，并建造了新的中子EDM实验，包括日本的创新和合作伙伴捐款。一旦升级完成，该来源预计将提供世界上UCN的最高密度。该来源将用于将基本物理实验推向前所未有的精度水平。未来三年我们的活动将涉及UCN源升级和NEDM实验构建的完成。我们还将使用TriumF的现有UCN来源进行实验，以回答有关实验整体成功的关键问题。