PM: Search for New Physics Beyond the Standard Model through Precision Isotope Shift Measurements

PM：通过精密同位素位移测量寻找标准模型之外的新物理

• 批准号: 2207996
• 负责人: Vladan Vuletic
• 金额: $ 78.4万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2207996&HistoricalAwards=false
• 关键词: PM; Search; New; Physics; Beyond; PM; Search; New; Physics; Beyond

High-precision experiments at low energies offer compelling opportunities to search for new physics beyond the Standard Model of particle physics. It is proposed to set improved bounds for a new fundamental force by performing precision measurements of isotope shifts (minute perturbations in the colors of light emitted by atoms due to changes in the number of neutrons in the nucleus). By comparing isotope shifts measured on different colors of light emitted by the same element, it is possible to search for new particles that signal a new fundamental force. The proposed work will unite research and educational goals by training undergraduate and graduate students, and strive to increase the participation of underrepresented groups.In particular, it is proposed to improve high-precision isotope shift spectroscopy in Yttervium (Yb) by four orders of magnitude to search for a new boson that couples to quarks and leptons in the intermediate mass range of 100 eV to 100 MeV (divided by the square of the speed of light). In this approach, a nonlinearity in a so-called King plot, which compares isotope shifts for two different transitions, provides sensitivity to physics beyond the Standard Model, as well as to previously inaccessible nuclear effects. Spectroscopy will be performed on three different transitions in laser-cooled and trapped Yb+ ions, where the precision will be improved by four orders of magnitude from the current level of 1 kHz to ∼ 0.1 Hz. This will not only enable the observation of previously inaccessible nuclear effects, but also push the limit for the coupling of the new boson to standard matter into a previously untested range. The sensitivity to new physics can be dramatically improved if additional isotopes can be made available. Therefore, an extraction and trapping apparatus will be developed that will be used to trap and measure the unstable 166Yb isotope, and provide the capability to measure other unstable isotopes at accelerator facilities.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.

低能量的高精度实验为搜索粒子物理标准模型以外的新物理学提供了令人信服的机会。提议通过执行同位素偏移的精确测量（由于原子核中中子的数量变化而引起的光原子颜色的微小扰动），以设置改善新基本力的边界。通过比较在同一元素发出的不同颜色的光的不同颜色上测量的同位素变化，可以搜索向新的基本力发出的新粒子。 The proposed work will unite research and educational goals by training undergraduate and graduate students, and strive to increase the participation of underrepresented groups.In particular, it is proposed to improve high-precision isotope shift spectroscopy in Yttervium (Yb) by four orders of magnitude to search for a new boson that couples to quarks and leptons in the intermediate mass range of 100 eV to 100 MeV (divided by the square光速）。在这种方法中，在所谓的国王图中的非线性比较了两个不同的过渡的同位素变化，它对标准模型以外的物理以及以前无法访问的核效应提供了敏感性。光谱法将在激光冷却和捕获的Yb+离子中的三个不同的跃迁上进行，其中将通过从1 kHz的电流水平提高到四个数量级，从1 kHz的水平提高到约0.1 Hz。这不仅将使以前无法访问的核效应观察到，而且还可以将新玻色子耦合到标准物质偶联到先前未经测试的范围内的极限。如果可以提供其他同位素，可以动态提高对新物理的敏感性。因此，将开发出一种提取和诱捕设备，该设备将用于捕获和测量不稳定的166yb同位素，并提供了在Accelerator设施中测量其他不稳定同位素的能力。该奖项反映了NSF的法定任务，并通过使用该基金会的知识优点和广泛影响来评估NSF的法定任务。