Lattice Effective Field Theory for Radiative Capture Reactions

辐射捕获反应的晶格有效场论

• 批准号: 1307453
• 负责人: Gautam Rupak
• 金额: $ 21.94万
• 依托单位: Mississippi State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1307453&HistoricalAwards=false
• 关键词: Lattice; Effective; Field; Theory; Radiative

The study of nuclear interactions and properties from the underlying theory of Quantum Chromodynamics (QCD) represents a central goal in nuclear physics research. At low energies, however, QCD becomes non-linear and strongly interacting, eluding first-principle pencil-and-paper calculations of nuclear properties. An important aspect of nuclear physics at low energy is the physics associated with weakly bound systems. Some properties of such systems are universally shared across atomic, nuclear and particle physics. The effective field theory (EFT) formulation allows for systematic calculations of nuclear properties that are deeply rooted in QCD. EFT allows reliable error estimates in calculations that are otherwise difficult to estimate in phenomenological approaches. In the supported research work, EFT for few-body systems involving electromagnetic radiation would be constructed. Key reactions involving light nuclei that are relevant in Big Bang Nucleosynthesis and stellar burning would be studied. Some of these reactions play an important role in interpreting experimental results probing physics beyond the Standard Model of particle physics. The proposed work would also introduce new model-independent tools with reliable error estimates to study halo nuclei. These nuclei are described as a tightly bound core with usually one or two valence neutrons forming a halo. This research ties in with planned major U.S. investment in rare isotope beam experiments. Broader impacts of the research include training of physics graduate students in numerical and analytical work for an academic or industry career benefiting society. Results from this research work would be incorporated in a graduate course. Atomic physics research would also be affected by this study of weakly bound few-body systems due to the universality described above. Atomic systems with large scattering lengths form an active field of theoretical and experimental research.

对量子染色体动力学基础理论（QCD）的核相互作用和性质的研究代表了核物理学研究中的一个核心目标。然而，在低能量下，QCD变为非线性且强烈相互作用，避免了对核性质的第一原则铅笔和纸的计算。低能核物理学的一个重要方面是与弱结合系统相关的物理学。这种系统的某些特性在原子，核和粒子物理学上普遍共享。有效的场理论（EFT）制定允许系统地计算QCD深层核能。 EFT允许在现象学方法中难以估计的计算中可靠的误差估计。在受支持的研究工作中，将构建涉及电磁辐射的几个体系统的EFT。将研究涉及大爆炸核合成和恒星燃烧的光核的关键反应。这些反应中的某些反应在解释实验结果探测粒子物理学的标准模型之外探测物理学方面起着重要作用。提出的工作还将引入新的独立于模型的工具，并具有可靠的错误估计来研究光环核。这些核被描述为一个紧密结合的核心，通常一个或两个价中子形成光环。这项研究与计划在稀有同位素束实验的美国大规模投资有关。这项研究的更广泛影响包括在学术或行业职业中对物理研究生的培训，从而使社会受益。这项研究工作的结果将纳入研究生课程。由于上述普遍性，原子质研究也将受到对弱约束几体系统的研究的影响。具有较大散射长度的原子系统形成了理论和实验研究的主动领域。