Nuclear Structure and Reactions from Lattice Effective Field Theory

晶格有效场论的核结构和反应

基本信息

批准号：
1615092
负责人：
Gautam Rupak
金额：
$ 26.41万
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：
2016
资助国家：
美国
起止时间：
2016-07-01 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1615092&HistoricalAwards=false
关键词：
Nuclear Structure Reactions Lattice Effective

项目摘要

Quantum Chromodynamics (QCD) is the theory of strong interactions, the fundamental force in nature that manifests itself by interactions between the building blocks of protons and neutrons that form the nuclei of atoms. Theoretical studies of QCD are central to nuclear physics efforts that seek a better understanding of the fundamental processes taking place in the Universe, processes that ultimately impact life on Earth. In this project, the PI will develop new theoretical and numerical techniques for calculating time-dependent quantities, in particular the nuclear reaction rates important for the development of astrophysical models of how nuclei interact to generate the fundamental elements that appear in the periodic table. Knowing these rates gives insight into the physics of the early universe and the nuclear reactions that produce the energy in stars. Broader impacts of this project include training of graduate students in numerical and analytical work for an academic or industry career benefiting society.This project builds on the adiabatic projection method for lattice EFT that was previously introduced by the investigator using funds from a U.S. National Science Foundation grant. Typical low energy reactions involve interactions between two atomic nuclei. The adiabatic projection method allows an effective two-body description of the participating nuclei starting from a microscopic description of the nuclei themselves in terms of several protons and neutrons. These ideas are developed further, here, in several ways. Mixed channel reactions are calculated that are important in describing inelastic processes. Reactions involving electromagnetic radiation would be calculated. Long-range interaction between nuclei due to the Coulomb force would be studied. 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. These calculations would complement similar efforts in the field of 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.

量子染色体动力学（QCD）是强相互作用的理论，这是自然界中的基本力，它通过形成原子核的质子和中子之间的构建块与中子之间的相互作用表现出来。 QCD的理论研究是核物理学努力的核心，这些核能努力寻求更好地理解宇宙中发生的基本过程，这些过程最终会影响地球上的生命。在该项目中，PI将开发新的理论和数值技术来计算时间依赖性数量，特别是对于开发核如何相互作用以生成元素周期表中出现的基本元素的天体物理模型的开发至关重要的核反应速率。了解这些速率可以洞悉早期宇宙的物理和产生恒星能量的核反应。该项目的更广泛的影响包括对学术或行业职业的研究生进行培训，从而使社会受益。该项目以晶格EFT的绝热投影方法为基础，该项目先前是由研究人员使用美国国家科学基金会资助的资金引入的。典型的低能反应涉及两个原子核之间的相互作用。绝热投影方法允许对参与核的有效两体描述，从几个质子和中子的微观描述开始。这些想法在这里进一步发展，以几种方式。计算了混合通道反应，这对于描述非弹性过程很重要。将计算涉及电磁辐射的反应。将研究由于库仑力引起的核之间的远程相互作用。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。这些计算将补充晕核核领域的类似努力。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。