Characterization of Systematic Effects in Ultracold Neutron Tests of Fundamental Symmetries
基本对称性超冷中子测试中系统效应的表征
基本信息
- 批准号:2310015
- 负责人:
- 金额:$ 23万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-07-01 至 2026-06-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
One of the most-successful and best-studied physical theories is the Standard Model (SM), which describes how the universe functions at very small scales. This model has been verified in many different ways over the course of five decades. In principle, such a fundamental theory should be able to predict observations about the universe at large scales, but in a number of notable cases it fails to do so. This suggests an exciting possibility, that there are fundamental features about the universe of which we are unaware. Since these unknown properties have so far evaded detection, discovering them requires experiments with a new level of sensitivity, requiring innovative approaches. Two such experiments leverage recent progress in the production of very low energy “ultracold” neutrons. They are UCNtau, which measures the average time required for a free neutron to decay, and nEDM, a measurement of the charge distribution in an isolated neutron. This project focuses on the development of three techniques designed to enhance the sensitivity of these experiments. The research effort will assemble a cross-disciplinary team to strengthen the synergy between science and technology and will target early undergraduates and pre-college students to more effectively connect practical research experience with the students’ academic work.The first of three primary research activities to be carried out in this project is the inclusion of empirically-determined magnetic field maps of the UCNτ Halbach array and ab initio simulations of the loaded ultracold neutron (UCN) phase space distribution into a semiclassical spin-tracking Monte Carlo model developed to account for entanglement between spatial and spin degrees of freedom. This goal will ensure that the characterization of systematic effects associated with spin dynamics (depolarization) keeps pace with anticipated improvements in statistical precision. The second core activity is to develop a real-time monitor for the UCNτ effort that will place run-by-run empirical limits on the depolarization rate and serve as a cross-check of the computational model. The third objective is to develop a quantum sensor, based on Nitrogen-Vacancy defects in diamond, optimized to aid in the control and characterization of magnetic and electric fields for nEDM experiments, thereby enhancing the sensitivity with which the neutron electric dipole moment can be measured.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
标准模型(SM)是最成功、研究得最好的物理理论之一,它描述了宇宙在非常小的尺度上是如何运行的。在过去的50年里,这个模型已经以许多不同的方式得到了验证。原则上,这样一个基本理论应该能够预测对大尺度宇宙的观测,但在许多值得注意的情况下,它没有做到这一点。这表明了一种令人兴奋的可能性,即宇宙中存在一些我们不知道的基本特征。由于这些未知的特性到目前为止还没有被发现,发现它们需要更高灵敏度的实验,需要创新的方法。两个这样的实验利用了最近在产生能量极低的“超冷”中子方面取得的进展。它们是UCNtau和nEDM,前者测量自由中子衰变所需的平均时间,后者测量孤立中子中的电荷分布。这个项目的重点是开发三种技术,旨在提高这些实验的灵敏度。研究工作将组建一个跨学科的团队,以加强科学和技术之间的协同作用,并将针对早期本科生和大学预科学生,以更有效地将实际研究经验与学生的学术工作联系起来。在该项目中进行的三项主要研究活动中的第一项是将经验确定的UCNτ Halbach阵列的磁场图和加载超冷中子(UCN)相空间分布的从头算模拟纳入半经典自旋跟踪蒙特卡罗模型,该模型开发用于解释空间和自旋自由度之间的纠缠。这一目标将确保与自旋动力学(去极化)相关的系统效应的表征与统计精度的预期改进保持同步。第二个核心活动是为UCNτ项目开发一个实时监测器,该监测器将对去极化率进行逐次的经验限制,并作为计算模型的交叉检查。第三个目标是开发一种基于金刚石氮空位缺陷的量子传感器,优化以帮助nEDM实验控制和表征磁场和电场,从而提高测量中子电偶极矩的灵敏度。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
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专利数量(0)
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Adam Holley其他文献
Adam Holley的其他文献
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{{ truncateString('Adam Holley', 18)}}的其他基金
CAREER: Investigation of Spin Evolution in Magnetic Ultracold Neutron Bottles Used to Measure the Free Neutron Lifetime
职业:研究用于测量自由中子寿命的磁性超冷中子瓶中的自旋演化
- 批准号:
1553861 - 财政年份:2016
- 资助金额:
$ 23万 - 项目类别:
Continuing Grant
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