Precision Measurement of Nuclear Magnetic and Electric Dipole Moments using Spin-Precession in Ultralow Fields

利用超低场中的自旋进动精确测量核磁和电偶极矩

• 批准号: 333624660
• 负责人: Dr. Isaac Fan
• 金额: --
• 依托单位: Standort Berlin
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/333624660?language=en
• 关键词: Precision; Measurement; Nuclear; Magnetic; Electric

By precision measurements of the nuclear spin precession of polarized noble gases in ultra-low magnetic fields, we intend to address two open problems in fundamental physics: the origin of the dominance of matter over antimatter in the universe and the probing of the temporal stability of fundamental constants.The existence of a finite electric dipole moment of a nucleus like 129Xe, d(Xe), would indicate a significant CP-violation that could have caused the baryon-antibaryon asymmetry in todays universe. The interaction of the postulated nuclear electric dipole moment with an additionally applied electric field would shift the precession frequency from the pure Larmor frequency by an amount that is proportional to d(Xe). By using 3He-129Xe comagnetometry, we expect to reduce the currently accepted upper limit for d(Xe) by at least one order of magnitude.By the simultaneous measurement of 3He and 129Xe precession, we intend to measure the ratio of the two nuclear magnetic moments with an utmost precision. In this way we can probe the stability of the quark mass and in units of the quantum chromdynamic scale parameter.This project is closely connected to the nEDM-proposal of Peter Fierlinger from TU Munich, with whom we have collaborated in the course of the DFG priority programme.

通过对超低磁场中极化惰性气体的核自旋进动的精确测量，我们打算解决基础物理学中的两个开放问题：宇宙中物质优于反物质的起源和基本常数的时间稳定性的探测。像129Xe， d（Xe）这样的原子核的有限电偶极矩的存在，将表明一个重要的cp违反，可能导致今天宇宙中的重子-反重子不对称。假定的核电偶极矩与外加电场的相互作用会使进动频率偏离纯拉莫尔频率，偏移量与d（Xe）成正比。通过使用3He-129Xe磁强计，我们期望将目前接受的d（Xe）上限降低至少一个数量级。通过同时测量3He和129Xe进动，我们打算以最高的精度测量两个核磁矩的比值。这样我们就可以用量子色动力学尺度参数的单位来探测夸克质量的稳定性。该项目与慕尼黑工业大学的Peter Fierlinger的nedm提案密切相关，我们在DFG优先计划的过程中与他合作。