U.S.-Bulgarian Cooperative Research: Metastable States of Exotic Helium Atoms and Delayed Annihilation of Antiprotons in Helium

美国-保加利亚合作研究：奇异氦原子的亚稳态和氦中反质子的延迟湮灭

• 批准号: 9602189
• 负责人: Krzysztof Szalewicz
• 金额: $ 4.49万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9602189&HistoricalAwards=false
• 关键词: U.S.; Bulgarian; Cooperative; Research; Metastable

INT-96 Szalewicz This U.S.-Bulgaria Cooperative Research award will study "Metastable States of Exotic Helium Atoms and Delayed Annihilation of Antiprotons in Helium." The principal researchers are Dr. Krzysztof Szalewicz of the University of Delaware and Dr. Dimitre D. Bakalov of the Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences. The purpose of the project is to provide a high accuracy of ab initio quantum mechanical description of the metastable states of antiprotonic helium and of the phenomenon of delayed annihilation of antiprotons in helium. The project will give precise theoretical values for the energy levels of the few-body bound systems that are formed when stopping negative muons or antiprotons in helium, as well as the rates of various transitions (Auger, radiative, and laser stimulated) between these levels. The Coulomb energy levels of the muonic and antiprotonic helium-like atom will be calculated with a relative accuracy of 10 to the -7 using variational methods. The relativistic and quantum electrodynamics corrections -- including the fine and hyperfine splitting -- will be evaluated in the first order of perturbation theory. The Zeeman splitting of the levels in external homogeneous magnetic field of intensity up to 10 to the 4th Gauss will also be evaluated. Finally, the effect of molecular clusters will be estimated. This work should answer very important current questions about antimatter which could not be accomplished without this collaboration. This research in physics and astronomy fulfills the program objectives of bringing together leading experts in the U.S. and Bulgaria to combine complementary efforts and capabilities in areas of strong mutual interest and competence on the basis of equality, reciprocity, and mutuality of benefit. *** ??

INT-96 SZALEWICZ这项美国 - 布尔加利亚合作研究奖将研究“异国情调的氦原子的亚稳态，并延迟了氦气中抗抗脂蛋白的歼灭”。 首席研究人员是特拉华大学的Krzysztof Szalewicz博士和保加利亚科学院核研究与核能研究所的Dimitre D. Bakalov博士。 该项目的目的是提供对抗流星氦亚稳态状态的量子量子机械描述的高度准确性，以及氦气中抗抑制剂的延迟an灭现象的现象。 该项目将为在氦气中停止负um或抗抗原子时形成的几种体型结合系统的能级提供精确的理论价值，以及在这些水平之间的各种过渡（弹药，辐射和激光刺激）的速率。 使用变异方法，Muonic和抗球星样原子的库仑能水平将以10的相对精度为10。 相对论和量子电动力学校正（包括精细的和超精细的分裂）将以扰动理论的第一顺序进行评估。 还将评估高达10至第四高斯的强度的外部均匀磁场中的水平分裂。 最后，将估计分子簇的效果。 这项工作应回答有关反物质的非常重要的问题，如果没有这种合作，就无法完成。 这项在物理和天文学方面的研究实现了将美国和保加利亚的主要专家汇集在一起​​的计划目标，以将互补的努力和能力结合在浓厚的共同利益和能力的领域，并基于平等，互惠和福利的共同性。 *** ??