Design and construction of an apparatus for the experimental search for the electric dipole moment (EDM) of 129xe

129xe电偶极矩（EDM）实验搜索装置的设计与构建

• 批准号: 218861983
• 负责人: Professor Dr. Werner Heil
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/218861983?language=en
• 关键词: Design; construction; apparatus; experimental; search

We propose to measure the permanent electric dipole moment (EDM) of the isotope 129Xe, which would imply a breakdown of both parity P and time-reversal symmetry T and, through the CPT theorem, a breakdown in CP, the combined symmetries of charge conjugation C and parity P. Our goal is to improve the present experimental limit (dXe < 3x10-27 e cm) by about four orders of magnitude. Historically, the non-observation of EDMs of particles and atoms has ruled out more speculative models (beyond the Standard Model) than any other single experimental approach in particle physics. The most precise EDM limit was measured in the diamagnetic atom 199Hg (dHg < 3.1x10-29 e cm). To get more stringent limits, we propose a 3He/129Xe clock comparison experiment with the detection of free spin precession of gaseous, nuclear polarized 3He or 129Xe samples with a SQUID as magnetic flux detector. The precession of co-located 3He/129Xe nuclear spins can be used as ultra-sensitive probe for non-magnetic spin interactions of type Δν ~ dXeE, since the magnetic dipole interaction (Zeeman-term) drops out in the frequency difference Δν of their Larmor frequencies. Compared to spin masers, the detection of free spin precession with spin coherence times T > 1 day doesn’t have the systematic limitations of a feedback loop necessary to sustain coherent spin precession.

我们建议测量同位素129 π的永久电偶极矩（EDM），这将意味着宇称P和时间反演对称性T的击穿，并通过CPT定理，CP的击穿，电荷共轭C和宇称P的组合对称性。我们的目标是将目前的实验极限（EDM <3 × 10 -27 e cm）提高约四个数量级。从历史上看，粒子和原子的EDM的非观测排除了比粒子物理学中任何其他单一实验方法更多的投机模型（超越标准模型）。最精确的EDM极限是在反磁性原子199 Hg（dHg < 3.1x10-29 e cm）中测量的。为了得到更严格的限制，我们提出了一个3 He/129 He的时钟比较实验，用SQUID作为磁通量探测器探测气态、核极化的3 He或129 He样品的自由自旋进动。3 He/129 He核自旋的进动可以作为Δν ~ dXeE型非磁自旋相互作用的超灵敏探针，因为磁偶极相互作用（塞曼项）在它们的Larmor频率的频率差Δν中消失.与自旋脉泽相比，自旋相干时间T > 1天的自由自旋岁差的检测不具有维持相干自旋岁差所需的反馈回路的系统限制。

项目成果

Precise measurement of magnetic field gradients from free spin precession signals of 3He and 129Xe magnetometers

• DOI: 10.1140/epjd/e2017-70505-4
• 发表时间: 2016-08
• 期刊: The European Physical Journal D
• 作者: F. Allmendinger;P. Blümler;M. Doll;Olivier Grasdijk;W. Heil;K. Jungmann;S. Karpuk;H. Krause;A. Offenhäusser;M. Repetto;U. Schmidt;Y. Sobolev;K. Tullney;L. Willmann;S. Zimmer

HP-Xe to go: Storage and transportation of hyperpolarized (129)Xenon.

HP-Xe to go：超极化 (129) 氙气的储存和运输

• DOI: 10.1016/j.jmr.2016.02.011
• 发表时间: 2016
• 期刊: Journal of magnetic resonance
• 影响因子: 2.2
• 作者: M. Repetto;S. Zimmer;F. Allmendinger;P. Blümler;M. Doll;J.O. Grasdijk;W. Heil;K. Jungmann;S. Karpuk;H.-J. Krause;A. Offenhäusser;U. Schmidt;Y. Sobolev;L. Willmann
• 通讯作者: L. Willmann