Ultracold Neutrons at TRIUMF

TRUMF 的超冷中子

• 批准号: SAPPJ-2016-00024
• 负责人: Martin, Jeffery
• 金额: $ 30.23万
• 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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=658889
• 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 have nearly completed 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 in the world. The UCN we will produce will be used to advance fundamental physics experiments to unprecedented levels of precision.****Initially we are focused on a measurement of the neutron electric dipole moment (nEDM), and it is primarily our activities on R&D for this experiment which require support from NSERC. 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, it constrains broad classes of theories which may not conserve CP, for example supersymmetry. A new measurement will also further constrain 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 obviously be a major discovery, since it could potentially shed light on such a broad range of theories.****Our activities over the next three years will involve the completion of the UCN facility at TRIUMF, and the completion of key research and development that will enable a future world-leading neutron electric dipole moment experiment.**

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特性，以根据粒子物理的标准模型来寻找与期望的偏差。 该来源预计将提供世界上UCN的最高密度。 我们将生产的UCN将用于将基本物理实验推向前所未有的精度水平。 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。 相当普遍，它限制了可能无法保存CP的广泛理论类别，例如超对称性。 新的测量还将进一步限制标准模型中的长期谜团，涉及强大力量引起的明显缺乏CP违规。 发现非零NEDM显然是一个重大发现，因为它可能会阐明如此广泛的理论。****我们在未来三年内的活动将涉及Triumf的UCN设施完成，并且可以完成关键的研究和开发，并且可以实现未来的世界领导的电力Dipole Moment实验。