Atomic physics of simple atoms of matter and antimatter.

物质和反物质简单原子的原子物理学。

• 批准号: RGPIN-2015-04482
• 负责人: Storry, Cody
• 金额: $ 2.91万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=666059
• 关键词: Atomic; physics; simple; atoms; matter

My research program focuses on atomic physics of simple atoms, largely exotic atoms including antimatter particles (positron (e+), antiproton (Pbar)). Much development has been dedicated to e+ systems for my 3 major research objectives at York, at the McMaster nuclear reactor (MNR) and at CERN. Positronic atoms with e+ bound to e- (Ps) or to an H- ion (e+H-) have been produced and continued measurements are proposed at York with extention at our new user facility at MNR. Continued trapped Antihydrogen (Hbar) and Pbar measurements are proposed at CERN.***Research is aimed at tests of fundamental physics including of QED and atomic theory. Comparisons of Hbar and hydrogen will test CPT, a corner stone of the Standard Model. ***     My research is highly anticipated in our field and in addition, contributes (e+ systems) to other research in other disciplines (eg solid state physics, materials science at MNR). My e+ and atomic physics work attract invitation to present at multiple international conferences annually. ***    e+ sources are based on radioactive beta+ decay of isotopes or pair production with intense gamma sources. For positronic atom physics (e+ bound to negatively charged particle, eg antiproton (Pbar), e-, H- .), e+ are slowed and then accumulated in a trap. Spectroscopy of these atoms requires many e+ to make sufficient atoms for high precision measurements and tests for systematic effects. We have improved on existing techniques and developed new ones, becoming a world leader, achieving record numbers and efficiencies for e+. Experiments at our newly developed user facility at the McMaster Intense Positron Beam Facility (MIPBF) at MNR are proposed that will further extend our capabilities with the much larger still expected e+ rates. We have developed the e+ production system near the reactor core and the beam guiding to send e+ to all users (eg. our apparatus for trapping e+ and experiments with positronic atoms). Over 100 times the e+ rate is expected. ***     In addition to these 3 major research programs, proposed contributions are also to 4 other experiments: I collaborate in precision measurements of helium fine-structure intervals and in a new program to re-measure the hydrogen Lamb shift at improved precision with the later aimed at solving the existing proton charge radius discrepancy puzzle. In addition the the Hbar trapping at CERN we have recently measured the antiproton magnetic moment at greatly improved precision. Next generation experiments proposed at CERN continue with the present Pbar beam time. Hbar research in our new apparatus will benefit from a new decelerator (ELENA) allowing increased Pbar trapping. Finally, in the proposed research, our experience depositing high purity neon crystals (e+ moderator) have led to research aimed at forming a new type of material, the electric equivalent of a permanent magnet, a permanent electret.**

我的研究项目侧重于简单原子的原子物理学，主要是奇异原子，包括反物质粒子（正电子 (e+)、反质子 (Pbar)），以实现我在约克麦克马斯特核中心的 3 个主要研究目标。反应堆（MNR）和欧洲核子研究中心（CERN）已经产生了 e+ 与 e-（Ps）或 H- 离子（e+H-）结合的正电子原子，并建议在约克继续进行测量，并在我们的实验室进行扩展。 MNR 的新用户设施。CERN 提议继续进行俘获反氢 (Hbar) 和 Pbar 测量。***研究旨在测试基础物理，包括 QED 和原子理论，Hbar 和氢的比较将测试 CPT。 ***       我的研究在我们的领域备受期待，此外，还为其他学科（例如 MNR 的固态物理学、材料科学）做出了贡献（e+ 系统）。和原子物理学工作每年吸引出席多个国际会议的邀请*** e+源基于同位素的放射性β+衰变或与强伽马源的配对产生对于正电子原子物理学（e+与带负电的粒子结合，例如反质子（ Pbar)、e-、H-.)、e+ 被减慢，然后在陷阱中累积，这些原子的光谱分析需要许多 e+ 才能产生足够的原子来进行高精度测量和系统效应测试。改进了现有技术并开发了新技术，成为世界领先者，在 MNR 麦克马斯特强正电子束设施 (MIPBF) 新开发的用户设施中实现了创纪录的 e+ 实验，这将进一步扩展我们的能力。我们在反应堆堆芯附近开发了 e+ 生产系统，并通过光束引导将 e+ 发送给所有用户（例如，我们用于捕获 e+ 的装置和正电子实验）。原子）预计超过 100 倍的 e+ 速率 ***    除了这 3 个主要研究项目之外，还对其他 4 个实验做出了贡献：我在氦精细结构区间的精确测量和一个新项目中进行了合作。以更高的精度重新测量氢兰姆位移，旨在解决现有的质子电荷半径差异难题。此外，我们最近还以大幅提高的精度测量了欧洲核子研究中心的 Hbar 俘获。 CERN 提出的 Hbar 生成实验继续在我们的新装置中进行 Hbar 束研究，这将受益于新的减速器 (ELENA)，它可以增加 Pbar 捕获。最后，在拟议的研究中，我们沉积高纯度氖晶体（e+ 慢化剂）的经验。 ）导致了旨在形成一种新型材料的研究，这种材料相当于永磁体的电学等效物，即永久驻极体。**