MRI: Development of a Unique Ion Trapping System to Test the Standard Model of Physics at the Nuclear Science Laboratory

MRI：开发独特的离子捕获系统来测试核科学实验室的物理标准模型

• 批准号: 1725711
• 负责人: Maxime Brodeur
• 金额: $ 53万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2023-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725711&HistoricalAwards=false
• 关键词: MRI; Development; Unique; Ion; Trapping

The human need to understand the inner workings of our universe has driven scientific questions both at the elementary level and at astronomical scales prompting the establishment of the Standard Model (SM), one of the cornerstone theories of physics that successfully predicted the Higgs boson. This theory however fails to reproduce many unexplained features of our visible universe, which currently prompts several different searches at the energy, intensity, and precision frontiers. By performing very precise measurements of fundamental quantities related to a special case of radioactive decay, one can probe for physics not included in the SM. The funds from this Major Research Instrumentation (MRI) grant will support the construction of an ion trapping apparatus, called NSLtrap, that will hold radioactive nuclei unimpeded in free space, allowing these delicate measurements to be performed. The research done with this instrument will raise the possibility of discovering physics beyond the SM, which could open wide new avenues for theoretical, experimental, and fundamental research. At the same time the development and operation of NSLtrap will train some of America's future scientific workforce in various aspects of research and development, including computation, design, assembly, troubleshooting, data gathering, data analysis and the dissemination of results. The skills acquired by the students will be transferable to careers that can advance the national health, prosperity and security. The NSLtrap project will aim at testing the Standard Model by providing a more stringent test of the Cabibbo-Kobayashi-Maskawa (CKM) matrix unitarity that relates the weak interaction and mass eigenstates of the quarks. The largest matrix element, Vud, can be extracted from four types of decay: pion decay, neutron decay, superallowed mixed decay, and superallowed pure Fermi decay transitions. Despite the high precision achieved in the pure Fermi decay studies, there is currently a growing interest in the other transitions to test the accuracy of Vud. The NSLtrap project plan is to expand the ensemble of mirror transitions from which the conserved vector current (CVC) hypothesis can be tested and Vud extracted by measuring a missing quantity called the Fermi-to-Gamow Teller mixing ratio. As a result, the more precise extraction of Vud from mirror transitions will create further constraints on the Vud matrix element determination from pure Fermi decays, improving its accuracy.

人类需要了解我们宇宙的内部运作，这推动了基础水平和天文尺度的科学问题，促使标准模型（SM）的建立，这是物理学的基石理论之一，成功地预测了希格斯玻色子。然而，这一理论未能再现我们可见宇宙的许多无法解释的特征，目前在能量，强度和精度前沿进行了几次不同的搜索。通过对与放射性衰变的特殊情况相关的基本量进行非常精确的测量，人们可以探测SM中不包括的物理学。来自这项重大研究仪器（MRI）拨款的资金将支持建造一种名为NSLtrap的离子捕获装置，该装置将在自由空间中保持放射性核不受阻碍，从而可以进行这些精细的测量。用这台仪器进行的研究将提高发现超越SM的物理学的可能性，这可能为理论，实验和基础研究开辟广阔的新途径。与此同时，NSLtrap的开发和运行将在研究和开发的各个方面培训美国未来的一些科学工作者，包括计算、设计、组装、故障排除、数据收集、数据分析和成果传播。学生获得的技能将转移到可以促进国家健康，繁荣和安全的职业。NSLtrap项目旨在通过对Cabibbo-Kobayashi-Maskawa（CKM）矩阵酉性提供更严格的测试来测试标准模型，该矩阵酉性与夸克的弱相互作用和质量本征态有关。最大的矩阵元Vud可以从四种衰变中提取：π衰变、中子衰变、超允许混合衰变和超允许纯费米衰变跃迁。尽管在纯费米衰变研究中达到了很高的精度，但目前人们对其他跃迁的兴趣越来越大，以测试Vud的准确性。NSLtrap项目计划是扩大镜像跃迁的集合，从中可以测试守恒矢量流（CVC）假设，并通过测量称为费米-伽莫夫-泰勒混合比的缺失量来提取Vud。因此，从镜像跃迁中更精确地提取Vud将对从纯费米衰变中确定Vud矩阵元产生进一步的约束，从而提高其准确性。

项目成果

The Beta-decay Paul Trap Mk IV: Design and commissioning

Beta 衰变 Paul Trap Mk IV：设计和调试

• DOI: 10.1016/j.nima.2023.168818
• 发表时间: 2024
• 期刊: Detectors and Associated Equipment
• 作者: Varriano, L.;Savard, G.;Clark, J.A.;Burdette, D.P.;Burkey, M.T.;Gallant, A.T.;Hirsh, T.Y.;Longfellow, B.;Scielzo, N.D.;Segel, R.
• 通讯作者: Segel, R.

Testing the weak interaction using St. Benedict at the University of Notre Dame

• DOI: 10.1016/j.nimb.2019.04.017
• 发表时间: 2020-01-15
• 期刊: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
• 影响因子: 1.3
• 作者: O'Malley, P. D.;Brodeur, M.;Varentsov, V.
• 通讯作者: Varentsov, V.

The St. Benedict Facility: Probing Fundamental Symmetries through Mixed Mirror β-Decays

圣本尼迪克特设施：通过混合镜β衰变探测基本对称性

• DOI: 10.3390/atoms11100129
• 发表时间: 2023
• 期刊: Atoms
• 影响因子: 1.8
• 作者: Porter, William S.;Bardayan, Daniel W.;Brodeur, Maxime;Burdette, Daniel P.;Clark, Jason A.;Gallant, Aaron T.;Houff, Alicen M.;Kolata, James J.;Liu, Biying;O’Malley, Patrick D.
• 通讯作者: O’Malley, Patrick D.

Stopped, bunched beams for the TwinSol facility

TwinSol 设施的停止束束

• DOI: 10.1007/s10751-019-1591-x
• 发表时间: 2019
• 期刊: Hyperfine Interactions
• 作者: Valverde, A. A.;Brodeur, M.;Burdette, D. P.;Clark, J. A.;Klimes, J. W.;Lascar, D.;O’Malley, P. D.;Ringle, R.;Savard, G.;Varentsov, V.
• 通讯作者: Varentsov, V.

Transport tests of the St. Benedict first-stage extraction system

• DOI: 10.1016/j.nima.2022.166509
• 发表时间: 2022-03
• 期刊: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 作者: C. Davis;O. Bruce;D. Burdette;T. Florenzo;B. Liu;J. Long;P. O'malley;M. Yeck;M. Brodeur