U.S.-Czech Physics Research on Asymptotic Normalization Coefficients in Nuclear Astrophysics

美国-捷克核天体物理渐近归一化系数的物理研究

• 批准号: 0302441
• 负责人: Robert Tribble
• 金额: $ 0.7万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0302441&HistoricalAwards=false
• 关键词: U.S.; Czech; Physics; Research; Asymptotic

This US-Czech research project between Robert E. Tribble of Texas A&M's Cyclotron Institute with partner Vaclav Kroha at the Czech Nuclear Physics Institute, Rez, will apply techniques they developed to determine the direct capture contribution for a number of reactions that are important in the hydrogen-burning phase of stellar evolution. We know that stars evolve by burning their nuclear fuel through a sequence of reaction cycles and decays. The US-Czech team uses a novel indirect method to determine astrophysical capture reaction rates at stellar energies. Now published, that new approach, called the Asymptotic Normalization Coefficients (ANCs) method, is widely used by experimental groups.This phase of the collaboration involves further use of the ANCs method to study important stellar capture reactions in the hot CNO cycle, with the goal of understanding the evolution of supermassive stars. Both groups have core support from non-NSF sources. The NSF award supports the participation of graduate and undergraduate students from Texas A&M who will travel to the Nuclear Physics Institute for joint research and to learn about setup and operation of a gas cell at the Rez facility. The knowledge gained will enable them to carry out precision studies of ANCs with gas targets on the Texas MDM magnetic spectrometer and to perform data analysis. At the undergraduate level, the experience will contribute to work needed for completing an honors thesis.Much new information is now available from astronomical observations that require modeling of nuclear processes to understand. The synergy between observation, stellar modeling and nuclear physics that the US-Czech team brings to bear is expected to advance our understanding of stellar evolution. This nuclear astrophysics project thereby fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.

德克萨斯州A＆M的Cyclotron Institute的Robert E. Tribble与REZ捷克核物理学研究所的合作伙伴Vaclav Kroha之间的美国策划研究项目将采用他们开发的技术来确定在恒星进化的氢燃料燃料阶段重要的许多反应的直接捕获贡献。我们知道，恒星通过一系列反应周期和衰减来燃烧核燃料来发展。 US-CZECH团队使用一种新型的间接方法来确定恒星能量处的天体物理捕获反应率。 现在发表的新方法称为渐近归一​​化系数（ANC）方法，已被实验组广泛使用。该协作的阶段涉及进一步使用ANC方法来研究热CNO周期中重要的恒星捕获反应，目的是了解超级质量星的演化。 两组都有非NSF来源的核心支持。 NSF奖支持得克萨斯州A＆M的研究生和本科生的参与，他们将前往核物理研究所进行联合研究，并了解REZ设施的煤气电池的设置和操作。 获得的知识将使他们能够在德克萨斯州MDM磁性光谱仪上对具有气体目标的ANC进行精确研究并进行数据分析。 在本科层面上，经验将有助于完成荣誉论文所需的工作。现在可以从需要对核过程进行建模才能理解的天文观察中获得新信息。预期，美国奇异队带来的观察，出色的建模和核物理学之间的协同作用将促进我们对恒星进化的理解。 因此，这项核天体物理学项目实现了通过使美国和中欧的专家能够结合互补才能并在浓厚的共同利益和能力领域中共享研究资源来促进科学知识的计划目标。