US-Belgium Cooperative Science: Nuclear Astrophysics with Radioactive and Isomeric Beams and Targets

美国-比利时合作科学：放射性和异构束和目标的核天体物理学

• 批准号: 8904013
• 负责人: William Rodney
• 金额: $ 1.78万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904013&HistoricalAwards=false
• 关键词: US; Belgium; Cooperative; Science; Nuclear

This award will support joint research in nuclear astrophy- sics between two groups of U.S. and Belgian physicists. The U.S. group will be under the direction of Dr. William S. Rodney, Georgetown University. The Belgium collaborator is Dr. J. Vervier, Institute for Nuclear Physics, Louvain, Belgium. The objective of this project is to carry out a program of experiments using radioactive beams to measure cross sections important to understanding nucleosynthesis. In novae, supernovae, X-ray bursters and possibly in the early universe, the temperature and density were such that the lifetimes of some radioactive (and isomeric) nuclides were comparable with the burning times for their destruction by proton- or alpha-particle-induced nuclear reactions. In these instances, these reactions must be taken into account in developing models for stellar evolution and nucleosyn- thesis. Thus, the potential for the use of radioactive targets and/or beams is receiving increasing attention in the nuclear physics community. In this project, the series of experiments outlined represent a major step in the direction of providing the needed cross section information. The Louvain-la-Neuve coupled cyclotron facility will be able to produce the required beam intensity to carry out these experiments. There are no existing U.S. facilities capable of such radioactive beam measurements. The research will benefit from Dr. Rodney's expertise in nuclear astrophysics and the background of his research group in active nuclear experimentation. The results of this research will contribute to our understanding of stellar evolution and nucleosynthesis in stars.

该奖项将支持两组美国和比利时物理学家之间的核天体学共同研究。 美国小组将在乔治敦大学的William S. Rodney博士的指导下。 比利时的合作者是比利时卢旺的核物理研究所J. Vervier博士。 该项目的目的是使用放射光束进行实验程序，以测量对理解核合成重要的横截面。 在Novae，Supernovae，Supernovae，X射线助力器以及可能在早期的宇宙中，温度和密度使得某些放射性（和异端）核素的寿命与质子或α-托盘诱导的核反应的破坏的燃烧时间相当。 在这些情况下，必须考虑到开发出恒星进化和核对论的模型。 因此，使用放射性靶标和/或光束的潜力在核物理界受到越来越多的关注。 在这个项目中，概述的一系列实验代表了提供所需的横截面信息方向的主要步骤。 Louvain-La-Neuve耦合的回旋器设施将能够产生所需的光束强度以进行这些实验。 没有现有的美国设施能够进行此类放射性光束测量。 这项研究将受益于罗德尼博士在核天体物理学方面的专业知识及其主动核试验研究小组的背景。 这项研究的结果将有助于我们对恒星中恒星进化和核合成的理解。