Production of Positronium atoms, ions, and molecules
正电子原子、离子和分子的生产
基本信息
- 批准号:EP/S036571/1
- 负责人:
- 金额:$ 108.78万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2019
- 资助国家:英国
- 起止时间:2019 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Positronium is an atomic system made from an electron-positron pair, which has many similarities to hydrogen in terms of its atomic properties. Being composed of a particle-antiparticle pair makes the Ps system more complex than hydrogen, however, because the possibility of both self and virtual annihilation processes plays a large role in the fundamental energy level structure and in the practicalities of performing experiments. Nevertheless, recent advances in positron trapping technology have made it possible to produce high-density Ps gases in which Ps-Ps scattering is readily observed, and which can be probed with lasers. Experiments have succeeded in producing Ps2 molecules and exciting them with laser light, observing Ps-Ps scattering, and the subsequent spin polarization of a Ps gas. The shift of Ps energy levels caused by interactions with the internal surfaces of mesoscopic porous films has also been observed.With an increased beam density it will be possible to generate Ps2 molecules with higher efficiency, and therefore to study their properties in much greater detail. A more robust source of Ps2 molecules also allows for the production of both positive and negative Ps ions, which can be created using lasers to break up a Ps2 molecule. These ions and molecules are stable atomic systems (although they do self-annihilate) and can be studied optically. Because they are composed of three or four bodies of equal mass approximations like the Born-Oppenheimer approach (where electrons and nuclei are treated independently) cannot be used. Thus, Ps ions and molecules present an interesting challenge to theorists. They also possess unique properties that have so far not been widely studied experimentally. The availability of a source of cold Ps atoms is also a key step in several experimental endeavors, including high resolution spectroscopy and (anti)matter wave interferometry, which can be used to test bound state QED theory and search for new physics. Ps atoms are pure QED systems, as QED is a theory of light and leptons, and so they are especially sensitive to non-QED effects, such as unknown particles or forces. If they can be studied in sufficient detail these simplest of systems may reveal some of the best kept secrets in the universe.
正电子素是由电子-正电子对组成的原子系统,就其原子性质而言,它与氢有许多相似之处。然而,由粒子-反粒子对组成的Ps系统比氢更复杂,因为自湮灭和虚湮灭过程的可能性在基本能级结构和执行实验的实际性中起着很大的作用。然而,正电子捕获技术的最新进展使人们有可能产生高密度的Ps气体,其中很容易观察到Ps-Ps散射,并且可以用激光探测。实验已经成功地产生了Ps2分子,并用激光激发它们,观察到Ps-Ps散射,以及随后Ps气体的自旋极化。由于与介观多孔膜内表面的相互作用,Ps能级发生了移动,随着束流密度的增加,有可能以更高的效率产生Ps 2分子,从而更详细地研究它们的性质。更强大的Ps2分子来源还允许产生正负Ps离子,这些离子可以使用激光来分解Ps2分子。这些离子和分子是稳定的原子系统(尽管它们会自我湮灭),可以用光学方法进行研究。因为它们是由三个或四个质量相等的物体组成的,所以不能使用类似玻恩-奥本海默方法(其中电子和原子核被独立处理)的近似值。因此,Ps离子和分子对理论家提出了一个有趣的挑战。它们还具有独特的性质,迄今为止尚未进行广泛的实验研究。冷Ps原子源的可用性也是几项实验努力的关键步骤,包括高分辨率光谱学和(反)物质波干涉术,可用于测试束缚态QED理论和寻找新物理。Ps原子是纯QED系统,因为QED是一种光和轻子的理论,所以它们对非QED效应特别敏感,例如未知粒子或力。如果能够对这些最简单的系统进行足够详细的研究,它们可能会揭示宇宙中一些最好的秘密。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Positronium density measurements using polaritonic effects
利用极化子效应测量正电子密度
- DOI:10.1103/physreva.107.023306
- 发表时间:2023
- 期刊:
- 影响因子:2.9
- 作者:Cortese E
- 通讯作者:Cortese E
Positronium microwave spectroscopy using Ramsey interferometry
使用拉姆齐干涉测量法的正电子微波光谱
- DOI:10.1140/epjd/s10053-022-00448-w
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Babij T
- 通讯作者:Babij T
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David Cassidy其他文献
New mechanism for positronium formation on a silicon surface.
在硅表面形成正电子素的新机制。
- DOI:
10.1103/physrevlett.106.133401 - 发表时间:
2011 - 期刊:
- 影响因子:8.6
- 作者:
David Cassidy;T. Hisakado;Harry W. K. Tom;A. P. Mills - 通讯作者:
A. P. Mills
Production of a fully spin-polarized ensemble of positronium atoms.
产生完全自旋极化的正电子原子系综。
- DOI:
10.1103/physrevlett.104.173401 - 发表时间:
2010 - 期刊:
- 影响因子:8.6
- 作者:
David Cassidy;V. Meligne;A. P. Mills - 通讯作者:
A. P. Mills
Factors Influencing Neck Pain Intensity in Whiplash-Associated Disorders
颈部扭伤相关疾病中影响颈部疼痛强度的因素
- DOI:
10.1097/01.brs.0000199901.52053.87 - 发表时间:
2006 - 期刊:
- 影响因子:3
- 作者:
L. Holm;L. Carroll;David Cassidy;A. Ahlbom - 通讯作者:
A. Ahlbom
Cesium extraction from Cs0.8Ba0.4Ti8O16 hollandite nuclear waste form ceramics in nitric acid solutions
- DOI:
10.1557/jmr.2005.0204 - 发表时间:
2005-06-01 - 期刊:
- 影响因子:2.900
- 作者:
Vittorio Luca;David Cassidy;Elizabeth Drabarek;Keith Murray;Boujemaa Moubaraki - 通讯作者:
Boujemaa Moubaraki
David Cassidy的其他文献
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{{ truncateString('David Cassidy', 18)}}的其他基金
Quantum Sensing for Antimatter Gravity
反物质重力的量子传感
- 批准号:
ST/W006189/1 - 财政年份:2022
- 资助金额:
$ 108.78万 - 项目类别:
Research Grant
Precision Microwave Spectroscopy of Positronium
正电子的精密微波光谱
- 批准号:
EP/W032023/1 - 财政年份:2022
- 资助金额:
$ 108.78万 - 项目类别:
Research Grant
Control and Spectroscopy of Excited States of Positronium
正电子激发态的控制和光谱学
- 批准号:
EP/R006474/1 - 财政年份:2017
- 资助金额:
$ 108.78万 - 项目类别:
Research Grant
Production and manipulation of Rydberg positronium for a matter-antimatter gravitational free fall measurement
用于物质-反物质重力自由落体测量的里德伯正电子素的生产和操作
- 批准号:
EP/K028774/1 - 财政年份:2013
- 资助金额:
$ 108.78万 - 项目类别:
Research Grant
The American Occupation and German Science, 1945-1949
美国占领与德国科学,1945 年至 1949 年
- 批准号:
9022313 - 财政年份:1991
- 资助金额:
$ 108.78万 - 项目类别:
Standard Grant
相似海外基金
Cryogenic cooling of positronium atoms by ultrasonic cavitation
通过超声空化对正电子素原子进行低温冷却
- 批准号:
22H01240 - 财政年份:2022
- 资助金额:
$ 108.78万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
RUI: Positronium Scattering By Atoms, Molecules and Surfaces
RUI:原子、分子和表面的正电子散射
- 批准号:
2011262 - 财政年份:2020
- 资助金额:
$ 108.78万 - 项目类别:
Continuing Grant
RUI: Photoionization, Time Delay, Positronium Formation, and Ion Impact Studies of Fullerenes, Endofullerenes, and Atoms
RUI:富勒烯、内富勒烯和原子的光电离、时间延迟、正电子形成和离子撞击研究
- 批准号:
1806206 - 财政年份:2018
- 资助金额:
$ 108.78万 - 项目类别:
Standard Grant
New developments of fundamental and applied researches on positronium neutral atoms and positronium negative ions
正电子中性原子和正电子负离子基础与应用研究新进展
- 批准号:
17H01074 - 财政年份:2017
- 资助金额:
$ 108.78万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Realization of laser cooling of positronium atoms and test of the weak equivalence principle using an optical frequency comb
光频梳实现正电子原子激光冷却及弱等效原理测试
- 批准号:
17H06205 - 财政年份:2017
- 资助金额:
$ 108.78万 - 项目类别:
Grant-in-Aid for Challenging Research (Pioneering)
MRI: Development of Instrumentation for Laser-Cooling and Precision Spectroscopy of Positronium Atoms, Molecules and Condensates
MRI:开发正电子原子、分子和凝聚物的激光冷却和精密光谱分析仪器
- 批准号:
1040590 - 财政年份:2010
- 资助金额:
$ 108.78万 - 项目类别:
Standard Grant
Positron and Positronium Collisions with Simple Atoms
正电子和正电子与简单原子的碰撞
- 批准号:
0968638 - 财政年份:2010
- 资助金额:
$ 108.78万 - 项目类别:
Continuing Grant
RUI: Low Energy Positronium Interactions with Atoms and Molecules in a Gas Environment
RUI:气体环境中低能正电子与原子和分子的相互作用
- 批准号:
0555631 - 财政年份:2006
- 资助金额:
$ 108.78万 - 项目类别:
Standard Grant
Study of the interactions between positronium and atoms or molecules
研究正电子素与原子或分子之间的相互作用
- 批准号:
16204029 - 财政年份:2004
- 资助金额:
$ 108.78万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Studies of Reaction Rate Constants of Positronium and Muonium Atoms (Chemistry)
正电子和缪原子反应速率常数的研究(化学)
- 批准号:
8403427 - 财政年份:1984
- 资助金额:
$ 108.78万 - 项目类别:
Continuing Grant