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.

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 symmetry 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.从历史上看，与粒子物理学中的任何其他单一的实验方法相比，颗粒和原子的EDM的非观察到了更多的投机模型（超出标准模型）。最精确的EDM极限是在199hg的Dimagnetic Atom中测量的（DHG <3.1x10-29 E CM）。为了获得更严格的限制，我们提出了一个3HE/129XE时钟比较实验，以检测自旋预防的气态，核极化3HE或129 XE样品，其squid作为磁通量检测器。由于磁偶极相互作用（Zeeman-Term）在其Larmor频率的频率差Δν中掉落，因此共同分配的3HE/129XE核自旋可以用作非磁性自旋相互作用的超敏感探针。与自旋masers相比，使用自旋相干时间t> 1天的自由旋转预防的检测并不具有维持相干旋转预防的反馈回路的系统局限性。

项目成果

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

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