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.

该奖项将支持核天文学的联合研究- 美国和比利时两组物理学家之间的科学研究。 美国小组将在威廉·S·史密斯博士的指导下工作。 罗德尼，乔治敦大学。 比利时的合作者是 J. Vervier博士，核物理研究所，鲁汶， 比利时. 该项目的目标是开展一项 用放射性束测量的实验计划 对理解核合成很重要 在新星、超新星、X射线爆发中， 早期宇宙的温度和密度 某些放射性（和同分异构）核素的寿命 与他们毁灭的燃烧时间相当 质子或α粒子引发的核反应。 在 必须考虑到这些情况，这些反应 在发展恒星演化和核同步的模型中， 论文 因此，使用放射性物质的可能性 目标和/或波束正受到越来越多的关注， 核物理学界。 在这个项目中，该系列 概述的实验代表了 提供所需横截面信息的方向。 Louvain-la-Neuve耦合回旋加速器设施将 能够产生所需的光束强度， 这些实验。 美国没有现有的设施 能够进行这种放射性束测量。 研究 将受益于罗德尼博士在核能方面的专业知识 天体物理学和他的研究小组的背景， 积极的核试验。 的结果 研究将有助于我们理解恒星 恒星的演化和核合成