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.

可靠的天体物理模型计算需要富含中子的核的质量，并且已被证明可以探测远离稳定性的核结构异常，并为核结构模型提供重要的约束和测试。我在这里提议使用良好的飞行时间（TOF）方法，首次测量硫中31个富含中子的核的质量。事实证明，用于质量测量的TOF技术是在先前的实验中在国家超导反导性回旋实验室（NSCL）上对非常短的核素进行质量测量的理想方法。结果表明，可以实现150 keV（6kev/q）的系统不确定性，而没有明显的系统趋势作为中子多余的功能。这种新开发的方法应应用于广泛的新群众，以完全利用它。这种测量将解决许多科学问题，包括了解中子星形的外壳过程和X射线瞬变的天文观察到远离稳定性的核结构的变化，例如新的壳封闭。