Time-of-flight mass measurements of neutron-rich nuclei

富中子核的飞行时间质量测量

• 批准号: 159378509
• 负责人: Dr. Sebastian George
• 金额: --
• 依托单位: Klinik für Kinder- und Jugendmedizin - Allgemeine Pädiatrie
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/159378509?language=en
• 关键词: Time; flight; mass; measurements; neutron

The masses of neutron-rich nuclei are needed for reliable astrophysical model calculations and have been shown to probe nuclear structure anomalies far from stability and to provide important constraints and tests for nuclear structure models. I propose here to measure the masses of 31 neutron-rich nuclei in the sulfur to cobalt region for the first time, using the well-established time-of-flight (TOF) method. The TOF technique for mass measurements has been proven to be an ideally suited method for mass measurements on very short-lived nuclides at the National Superconducting Cyclotron Laboratory (NSCL) in previous experiments. The results demonstrate that systematic uncertainties of the order of 150 keV (6keV/q) can be achieved with no obvious systematic trends as functions of neutron excess. This newly developed method shall be applied to a broad range of new masses to fully exploit it scientifically. There are a number of scientific questions this measurement will address, ranging from understanding neutron star crust processes and astronomical observations of X-ray transients to changes of nuclear structure far from stability such as new shell closures.

丰中子核的质量是可靠的天体物理模型计算所需要的，并且已经证明可以探测远离稳定的核结构异常，并为核结构模型提供重要的约束和检验。我在这里建议首次使用成熟的飞行时间（TOF）方法测量硫到钴区域中31个富中子核的质量。在美国国家超导回旋加速器实验室（NSCL）的实验中，TOF质量测量技术已被证明是一种理想的短寿命核素质量测量方法。结果表明，系统的不确定度的数量级为150 keV（6 keV/q），可以实现没有明显的系统趋势的中子过剩的函数。这一新发展的方法应广泛应用于新的群众，以科学地充分利用它。这项测量将解决许多科学问题，从理解中子星星地壳过程和X射线瞬变的天文观测到核结构远离稳定的变化，如新的壳层闭合。