Atomic parity violation in muonic X-rays

µ 子 X 射线中的原子宇称不守恒

• 批准号: 392566020
• 负责人: Dr. Frederik Wauters, Ph.D.
• 金额: --
• 依托单位: Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392566020?language=en
• 关键词: Atomic; parity; violation; muonic; rays

Muonic atoms are an excellent laboratory to study the interaction between the muon and the atomic nucleus as there is a large overlap of the muon wave function and the nucleus. Radiative atomic transitions, so-called muonic X-rays, yield accurate information on the size of the nucleus. In addition, the large overlap of the wave functions increases the sensitivity of this system for short-range interactions, in particular weak neutral currents inducing atomic parity violating effects in muonic X-rays. Data on neutral current effects at low energies is sparse however, and there is none with muons. New, muon specific interactions may introduce parity violating effects of the same order or larger than the amplitudes expected in the Standard Model of particle physics. These interactions are in part motivated by hints of physics beyond the Standard Model in recent muon data.In this proposal, we focus on the mixing of the opposite parity 2S and 2P atomic levels in muonic zinc. The scope of this proposal is:(a) to make a clean measurement of the single photon 2S-1S transition in zinc, determine its branching ratio in the atomic cascade, and to fully understand all relevant backgrounds. For this purpose, two measurements with a high-purity germanium detector array are planned at the Paul Scherrer Institute in Switzerland. A first beam time of two weak was approved this year.(b) to make an optimized experimental design for a future atomic parity violation experiment (APV) with muonic atoms, and to determine its beyond the Standard Model physics reach. (c) to make a significant contribution to the charge radius measurement of 226Ra. This measurement will serve as an important input for the upcoming atomic parity violating experiment with a single radium ion. (d) one PhD thesis at the Johannes Gutenberg University of Mainz.

μ子原子是研究μ子与原子核相互作用的理想实验室，因为μ子波函数与原子核有很大的重叠。辐射原子跃迁，即所谓的μ子X射线，可以提供关于原子核大小的准确信息。此外，波函数的大重叠增加了该系统对短程相互作用的灵敏度，特别是在μ子X射线中诱导原子宇称违反效应的弱中性电流。然而，关于低能中性电流效应的数据很少，而且没有μ子。新的μ子特定的相互作用可能会引入与粒子物理标准模型中预期的幅度相同或更大的宇称破坏效应。这些相互作用部分是由最近的μ子数据中超出标准模型的物理暗示所激发的。在这个提议中，我们专注于μ子锌中相反宇称2S和2 P原子能级的混合。这项建议的范围是：（a）对锌中的单光子2S-1 S跃迁进行清晰的测量，确定其在原子级联中的分支比，并充分了解所有相关背景。为此目的，计划在瑞士的Paul Scherrer研究所用高纯度锗探测器阵列进行两次测量。今年批准了两个弱的第一个光束时间。(b)对未来μ子原子宇称破坏实验（APV）进行了优化设计，并确定了其超出标准模型物理的范围。(c)为226 Ra的电荷半径测量做出了重要贡献。这一测量结果将作为即将进行的单个镭离子原子宇称违反实验的重要输入。(d)美因茨约翰尼斯古滕贝格大学的博士论文。