Studies of Nuclear Reactions and Structure

核反应和结构研究

• 批准号: 9970991
• 负责人: Samuel Tabor
• 金额: $ 381.95万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-05-15 至 2003-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9970991&HistoricalAwards=false
• 关键词: Studies; Nuclear; Reactions; Structure

9970991TaborThis is a proposal for support of the experimental nuclear physics group at Florida State University. The proposed research is to be carried out at the FSU Tandem/LINAC accelerator facility and at other laboratories around the U.S. Improvements at the FSU facility, including new high-efficiency 'clover' detectors, a radioactive 14C beam and an intenxe, highly polarized 7Li beam will be valuable for investigations of the high-spin structure of s-d shell nuclei far from stability to test microscopic and macroscopic nuclear models, for exploring octupole collectivity in actinide nuclei, and for studying the structure of neutron-rich mid-mass nuclei. The polarized 7Li beam provides an excellent way to explore how the shape and internal structure of a loosely bound nucleus affect scattering and transfer processes, especially the couplings to the continuum which are so important in halo nuclei. Our developments in resonant particle decay spectroscopy instrumentation will permit high resolution studies of the alpha decay properties of light nuclei to explore mirror states, cluster structure, and widths of astrophysical interest. The FSU Tandem/LINAC and associated instrumentation are well suited to precision fast-beam laser spectroscopy of few electron ions to test relativistic and higher order QED effects in atomic structure calculations.We propose to take advantage of the new capabilities at the National Superconducting Cyclotron Laboratory after the upgrade, including the compact beam sweeper magnet which FSU is helping build, to examine proton and neutron multipole matrix elements in exotic nuclei and to probe the momentum distributions of 'halo' nuclei. Experiments are planned using Gammasphere and Euroball to investigate the quenching of pairing correlations and possible other dramatic phase changes at ultra-high spins. Our group has the primary responsibility for constructing the two Ring-imaging Cherenkov detectors for the PHENIX experiment, which is optimized to study the interior of hot dense nuclear matter formed in relativistic heavy-ion collisions, and plans to be involved in 'mining' the data for signatures of quark-gluon plasma. Members of our group plan to exploit the new generation of electron accelerators and detectors for precision studies of the nucleon and light nuclei using the (e,e'p) reaction at Jefferson Lab, MIT-Bates, and the Mainz Microtron. Our group has been directly involved in the construction and commissioning of the CEBAF Large Acceptance Spectrometer at Jefferson Lab and is now involved in the e1 experimental program to study the electroproduction and decay of systems containing strange quarks to add to the understanding of fundamental two-particle interactions.

这是一份申请佛罗里达州立大学实验核物理小组支持的提案。提议的研究将在FSU Tandem/LINAC加速器设施和美国周围的其他实验室进行。FSU设施的改进，包括新的高效“三叶草”探测器，放射性14C束和强烈的高极化7Li束，对于研究远离稳定的s-d壳核的高自旋结构，测试微观和宏观核模型，探索锕系原子核中的八极集体，将是有价值的。也用于研究富含中子的中质量原子核的结构。极化7Li光束提供了一个很好的方法来探索松散束缚核的形状和内部结构如何影响散射和转移过程，特别是与连续体的耦合在晕核中是如此重要。我们在共振粒子衰变光谱仪器方面的发展将允许对轻核的α衰变特性进行高分辨率的研究，以探索镜像状态、团簇结构和天体物理兴趣的宽度。FSU Tandem/LINAC和相关仪器非常适合于精确的快束激光光谱，用于测试原子结构计算中的相对论和高阶QED效应。我们建议利用升级后国家超导回旋加速器实验室的新能力，包括FSU正在帮助建造的紧凑型束扫磁体，来检查奇异核中的质子和中子多极矩阵元素，并探测“晕”核的动量分布。实验计划使用Gammasphere和Euroball来研究在超高自旋下配对相关性的猝灭和其他可能的剧烈相变。我们的小组主要负责为PHENIX实验建造两个环成像切伦科夫探测器，该探测器被优化为研究相对论重离子碰撞中形成的热致密核物质的内部，并计划参与“挖掘”夸克-胶子等离子体特征的数据。我们小组的成员计划利用新一代的电子加速器和探测器，在杰斐逊实验室、麻省理工学院贝茨分校和美因茨Microtron使用（e,e'p）反应对核子和轻核进行精确研究。我们的团队直接参与了杰斐逊实验室CEBAF大接收谱仪的建造和调试，现在正在参与e1实验项目，研究含有奇异夸克的系统的电产生和衰变，以增加对基本两粒子相互作用的理解。