Coherence Effects: A Sensitive Tool to Study the Few-Body Dynamics in Simple Atomic Systems

相干效应：研究简单原子系统中少体动力学的敏感工具

• 批准号: 2011307
• 负责人: Michael Schulz
• 金额: $ 38.78万
• 依托单位: Missouri University of Science and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2011307&HistoricalAwards=false
• 关键词: Coherence; Effects; Sensitive; Tool; Study

General audience abstract:Understanding the laws of Nature on a fundamental level is the most important prerequisite for technological development. To this end, two major topics have to be addressed: a) a thorough understanding of the forces acting in Nature needs to be obtained. It is well established that, on an elementary particle level, the mediation of these forces can only occur between two particles at a time. This directly leads to the second topic: b) the description of the evolution of systems consisting of three or more particles under the influence of these pairwise acting forces. This is known as the Few-Body Problem (FBP) in physics and it remains one of the most fundamentally important, and yet unsolved problems in physics. The research supported by this grant aims to advance the understanding of the FBP by studying collision processes between ions and simple atoms or molecules. Such collisions represent systems consisting of a relatively small particle number (typically 3 to 5 particles), which are nevertheless sufficiently complex to be strongly affected by the unsolved FBP. This research will involve several graduate and undergraduate students and prepare them for the scientific and technological needs of society.Technical audience abstract:To address the Few-Body Problem (FBP), the research team will perform kinematically complete experiments on several atomic fragmentation processes. Their interest is focused on two aspects of the few-body dynamics: the importance of higher-order contributions and the role of projectile coherence effects. Until recently, theory focused on perturbative methods in describing such processes. In these models understanding the FBP means accurately describing the contributions of higher-order versus first-order contributions. Their experiments are designed to sensitively test perturbative models and to determine the limitations of such approaches. Regarding the second aspect, prior to recent work by this group and others, theory had assumed that the incoming projectiles are always fully coherent. In studies over the last 8 years the researchers have demonstrated that for heavy particles this is not always a realistic assumption because of the particles' very small deBroglie wavelengths. In the research supported by this grant the research team will use coherence effects as a sensitive tool to study interference effects in greater detail than was possible previously. Interference structures, in turn, usually contain rich information on the few-body dynamics underlying the collision process.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

普通观众摘要：从根本上理解自然规律是技术发展的最重要前提。为此，必须解决两个主要问题：a)需要彻底了解自然界中的作用力。众所周知，在基本粒子水平上，这些力的调节一次只能发生在两个粒子之间。这直接引出了第二个主题：b)描述由三个或更多粒子组成的系统在这些成对作用力的影响下的演化。这在物理学中被称为少体问题(FBP)，它仍然是物理学中最重要但尚未解决的问题之一。这项由这笔拨款支持的研究旨在通过研究离子与简单原子或分子之间的碰撞过程来促进对FBP的理解。这样的碰撞代表了由相对较小的粒子数量(通常是3到5个粒子)组成的系统，但这些粒子足够复杂，足以受到未解决的FBP的强烈影响。这项研究将涉及几名研究生和本科生，为他们满足社会的科学和技术需求做好准备。技术受众摘要：为了解决少体问题(FBP)，研究团队将对几个原子碎裂过程进行运动学上的完整实验。他们的兴趣集中在少体动力学的两个方面：高阶贡献的重要性和抛射相干效应的作用。直到最近，理论都集中在用微扰方法来描述这样的过程。在这些模型中，理解FBP意味着准确地描述高阶贡献相对于一阶贡献的贡献。他们的实验旨在灵敏地测试微扰模型，并确定这种方法的局限性。关于第二个方面，在这个小组和其他人最近的工作之前，理论假定射入的射弹总是完全连贯的。在过去8年的研究中，研究人员已经证明，对于重粒子来说，这并不总是一个现实的假设，因为粒子的DeBroglie波长非常小。在这笔赠款支持的研究中，研究小组将把相干效应作为一种敏感工具，比以前更详细地研究干扰效应。反过来，干涉结构通常包含关于碰撞过程背后的少体动力学的丰富信息。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Quantum interference of K capture in energetic Ge31+(1s)−Kr collisions

• DOI: 10.1103/physreva.101.042701
• 发表时间: 2020-04
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: R. Schuch;M. Schulz;Y. Kozhedub;V. Shabaev;I. Tupitsyn;G. Plunien;P. Mokler;H. Schmidt-Böcking

Electron-impact ionization and ionic fragmentation of O 2 from threshold to 120 eV energy range

O 2 从阈值到 120 eV 能量范围的电子轰击电离和离子碎裂

• DOI: 10.1142/s0217979221501046
• 发表时间: 2021
• 期刊: International Journal of Modern Physics B
• 影响因子: 1.7
• 作者: Lomsadze, R. A.;Gochitashvili, M. R.;Kezerashvili, R. Ya.;Schulz, M.
• 通讯作者: Schulz, M.

Fully differential investigation of two-center interference in dissociative capture in p+H2 collisions

p H2 碰撞解离捕获中双中心干扰的全微分研究

• DOI: 10.1103/physreva.105.032805
• 发表时间: 2022
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Bastola, S.;Dhital, M.;Lamichhane, B.;Silvus, A.;Lomsadze, R.;Davis, J.;Hasan, A.;Igarashi, A.;Schulz, M.
• 通讯作者: Schulz, M.

Projectile Coherence Effects in Simple Atomic Systems

简单原子系统中的射弹相干效应

• DOI: 10.1088/1742-6596/1412/6/062007
• 发表时间: 2020
• 期刊: Journal of Physics: Conference Series
• 作者: Schulz, M;Hasan, A;Lamichhane, B;Arthanayaka, T;Dhital, M;Bastola, S;Nagy, L;Borbély, S;Járai-Szabó, F
• 通讯作者: Járai-Szabó, F

Doubly differential ionization in proton-helium collisions at intermediate energies: Energy distribution of emitted electrons as a function of scattered-projectile angle

中间能量质子-氦碰撞中的双微分电离：发射电子的能量分布作为散射射弹角度的函数

• DOI: 10.1103/physreva.108.022803
• 发表时间: 2023
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Spicer, K. H.;Plowman, C. T.;Schulz, M.;Kadyrov, A. S.
• 通讯作者: Kadyrov, A. S.