Research in Strong-Interaction Theory

强相互作用理论研究

• 批准号: 0354916
• 负责人: Richard Furnstahl
• 金额: $ 57.47万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0354916&HistoricalAwards=false
• 关键词: Research; Strong; Interaction; Theory

Title of Project: Research in Strong-Interaction Theory Principal Investigators: R. J. Furnstahl, B. C. Clark, S. Jeschonnek, R. J. Perry The study of a wide range of problems involving strongly interacting systems is proposed. The projects proposed fall into several broad categories, ranging from studies directly involving quark and gluon degrees of freedom, to effective theories of the strong interaction at low energies, to analyses of strong-interaction experiments. Intellectual merit: The transition from hadronic degrees of freedom to quark-gluon degrees of freedom will be studied though increasingly sophisticated models of quark-hadron duality and by investigating short-range structure in light nuclei through improved theoretical tools for disentangling the nuclear ground state information from coincidence electron scattering data. These projects have strong and direct ties to the experimental program at Jefferson Lab. Other projects revisit QCD sum rules, which exploit another facet of quark-hadron duality. The renormalization group tools developed in the light-front field theory program are largely redirected toward low-energy effective field theories. Effective theories of nuclear systems, which are governed by low-energy quantum chromodynamics (QCD), are being developed from two directions. From one side, fundamental work extending effective field theories (EFT) for nucleon-nucleon, three-body systems, and many-body systems is proposed. In parallel, from the other side, are projects to improve phenomenological descriptions of realistic nuclear systems to reduce model dependence. The efforts complement each other and both will impact forefront problems in nuclear physics, such as the study of nuclei far from stability. Renormalization group methods play important roles in each category. The goal of model independence is naturally coupled with the recognition of universal aspects of the physics, which in turn enhances interactions with other disciplines. Ongoing efforts to develop relativistic descriptions of a wide range of nuclear reactions and nuclear structure (e.g., global optical potential, nuclear densities, meson-nucleus scattering, inelastic reactions) will take advantage of EFT input. Reliable extractions of neutron densities will be made for more nuclei, and the optical potentials will be extended to higher energies and applied to studies of parity violation. Broader impacts: The training received by undergraduates, graduate students, and postdoctoral research associates in carrying out the proposed activities contributes directly to the building of a diverse scientific workforce. The mix of analytical and numerical computation our students and postdocs must employ is excellent preparation for both academic and industrial research. Activities funded by an REU supplement will actively involve undergraduates in research; all previous REU students in the group who have graduated are either working in industry, or business, or enrolled in professional or graduate school. The group is committed to diversity in science and has successfully mentored several members of under-represented groups, including four who have obtained faculty positions. Several proposed projects provide data to the Nuclear Data Center at Brookhaven National Laboratory. Direct benefits to society include the development of global optical potentials, which are being used to estimate cross sections that are important for understanding long-term radioactive waste storage, and calculations of nuclear cross sections, which are used in predicting dosimetry for patients in radiation therapy.

项目名称：强相互作用理论研究主要研究者：R. J. Furnstahl， B. C. Clark， S. Jeschonnek， R. J. Perry提出了涉及强相互作用系统的广泛问题的研究。提出的项目分为几个大类，从直接涉及夸克和胶子自由度的研究，到低能量强相互作用的有效理论，再到强相互作用实验的分析。智力价值：从强子自由度到夸克-胶子自由度的转变将通过日益复杂的夸克-强子二象性模型来研究，并通过改进的理论工具来研究轻核中的短程结构，从而从符合电子散射数据中解纠缠核基态信息。这些项目与杰斐逊实验室的实验项目有着密切而直接的联系。其他项目重新审视了QCD和规则，它利用了夸克-强子对偶性的另一个方面。光前沿场理论项目中开发的重整化群工具在很大程度上转向了低能量有效场理论。由低能量子色动力学（QCD）控制的核系统的有效理论正从两个方向发展。一方面，提出了将有效场论扩展到核子-核子、三体系统和多体系统的基础工作。与此同时，从另一方面来看，改进现实核系统的现象学描述以减少对模型的依赖的项目。这些努力相辅相成，两者都将影响核物理学的前沿问题，例如对远离稳定的原子核的研究。重整化群方法在每一类中都起着重要的作用。模型独立的目标自然与对物理学普遍方面的认识相结合，这反过来又增强了与其他学科的相互作用。正在进行的对广泛的核反应和核结构（例如，全局光势、核密度、介子-核散射、非弹性反应）的相对论性描述的努力将利用EFT输入。将对更多的原子核进行可靠的中子密度提取，并将光势扩展到更高的能量并应用于宇称破坏的研究。更广泛的影响：本科生、研究生和博士后研究人员在开展拟议活动时所接受的培训，直接有助于建立一支多样化的科学队伍。我们的学生和博士后必须使用的分析和数值计算的混合是学术和工业研究的极好准备。由REU增刊资助的活动将积极吸引本科生参与研究；所有毕业的前REU学生要么在工业或商业领域工作，要么在专业或研究生院就读。该小组致力于科学的多样性，并成功地指导了一些代表性不足的群体的成员，其中包括四名获得教职的成员。几个拟议的项目为布鲁克海文国家实验室的核数据中心提供数据。对社会的直接好处包括全球光势的发展，它被用来估计对理解长期放射性废物储存很重要的横截面，以及核横截面的计算，它被用于预测放射治疗患者的剂量学。