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。

基本信息

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：
2016
资助国家：
加拿大
起止时间：
2016-01-01 至 2017-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=612991
关键词：
Atomic physics simple atoms matter

项目摘要

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。欧洲核子研究中心 (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，这是标准模型的基石。我的研究在我们的领域备受期待，此外，对其他学科的其他研究（例如固态物理学、MNR 的材料科学）也做出了贡献。我的 e+ 和原子物理学工作每年都会受到邀请在多个国际会议上发表演讲。。 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+被减慢然后累积。这些原子的光谱需要许多 e+ 来制造足够的原子来进行高精度测量和系统效应测试，我们改进了现有技术并开发了新技术，成为世界领先者，创下了记录。建议在 MNR 的麦克马斯特强正电子束设施 (MIPBF) 新开发的用户设施中进行实验，这将进一步扩展我们的能力，以实现更大的预期 e+ 速率。我们已经在附近开发了 e+ 生产系统。反应堆堆芯和光束引导将 e+ 发送给所有用户（例如，我们用于捕获 e+ 的装置和正电子原子实验），预计 e+ 速率将超过 100 倍。除了这 3 个主要研究项目之外，拟议的贡献还涉及其他 4 个实验：我合作进行氦精细结构间隔的精确测量，以及一个新项目，以提高精度重新测量氢兰姆位移，后者的目标是解决现有的质子电荷半径差异难题此外，我们最近在欧洲核子研究中心（CERN）提出的下一代实验继续使用当前的 Pbar 束时间，测量了反质子磁矩。我们的新设备中的 Hbar 研究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新型材料的研究。，相当于永磁体、永久驻极体的电学等效物。