ARI-MA: Development of a New Method for Interrogating Special Nuclear Materials Based Upon Polarized (gamma, n) Asymmetries

ARI-MA：开发一种基于极化（gamma，n）不对称性的特殊核材料新方法

• 批准号: 0938773
• 负责人: Henry Weller
• 金额: $ 40万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0938773&HistoricalAwards=false
• 关键词: ARI; MA; Development; New; Method

The proposed research will contribute to the development of new technologies to perform non-intrusive detection of nuclear materials that could pose a threat to national security. There are a number of methods for cargo interrogation under development that are based on using gamma-ray beams to identify specific nuclear isotopes. Nuclear data are needed to interpret the results of measurements of gamma-ray induced reactions and to identify the nuclear isotopes of interest. This proposal will utilize the intense polarized gamma-ray beam of the HIgammaS facility (at Duke University) to investigate the use of polarization observables as a means of finger printing isotopes. The premise of the proposed technique is that the magnitude and the energy dependence of the ratio of parallel to perpendicular neutron yields is unique for the isotopes of interest.Deliverables include the ratio of the yields of neutrons emitted parallel vs. perpendicular to the direction of polarization for 25 different isotopes measured at incident energies between 10 and 20 MeV. Special attention will be paid to the isotopes of 233, 235, 238U, 239Pu, and 237Np. These results will be the foundation of a polarization-based technique of cargo interrogation and will guide the technical specifications for the development of intense polarized gamma-ray beam sources such as the T-REX source currently being developed at Lawrence Livermore National Laboratory. These polarized beam studies of photo-fission reactions, being unique and original, will lead to new insights into the nature of fission reactions. Graduate and undergraduate students, including students from a historically black university, will participate in all aspects of this research project and receive hands-on training in all of the techniques needed to execute the proposed research.

拟议的研究将有助于开发新技术，对可能对国家安全构成威胁的核材料进行非侵入性探测。 目前正在开发一些货物询问方法，这些方法基于使用伽马射线束来识别特定的核同位素。 需要核数据来解释伽马射线诱发反应的测量结果，并确定感兴趣的核同位素。 该提案将利用HIGammaS设施（杜克大学）的强极化伽马射线束，研究使用极化观测值作为同位素指纹的一种手段。 所提出的技术的前提是，平行与垂直的中子产额的比率的大小和能量依赖性是唯一的感兴趣的同位素。可测量的包括平行与垂直于极化方向发射的中子的产额的比率为25种不同的同位素在入射能量在10和20 MeV之间测量。 特别注意233、235、238 U、239 Pu和237 Np的同位素。 这些结果将成为基于偏振的货物询问技术的基础，并将指导开发强偏振伽马射线束源（如劳伦斯利弗莫尔国家实验室目前正在开发的T-REX源）的技术规格。 这些光裂变反应的偏振光束研究，是独特的和原始的，将导致新的见解裂变反应的性质。 研究生和本科生，包括来自历史悠久的黑人大学的学生，将参与本研究项目的各个方面，并接受执行拟议研究所需的所有技术的实践培训。