Laser resonance ionization mass spectroscopy of radioactive isotopes

放射性同位素的激光共振电离质谱

• 批准号: SAPIN-2017-00039
• 负责人: Lassen, Jens
• 金额: $ 2.33万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=743209
• 关键词: Laser; resonance; ionization; mass; spectroscopy

The program in "Laser resonance ionization mass spectrometry of radioactive isotopes" seeks to investigate trends in the optical isotope shifts in isotopes of At, Ra, Ac, and the actinide elements many of which have not been measured before. Laser resonance ionization has emerged as a highly sensitive and selective method in trace detection, which also allows to probe nuclear structure of ground state and long lived isomeric states of atomic nuclei. In combination with radioactive ion beam facilities that give access to a great number of isotopes of particular elements, this technique can be used to map the evolution of nuclear structure from stability out to the drip lines. The nuclear information is accessed via laser spectroscopy of the atomic electrons that probe the nucleus. This interaction is a sensitive, non-destructive probe that allows to extract subtle nuclear effects in a largely model independent way. The particular nuclear properties measureable are: nuclear spin, magnetic dipole and electric quadrupole moments and changes in the root mean square charge radii among isotopes of a specific element in a nuclear chain. In some cases higher order effects such as magnetic octupole moments can be extracted as well. The results of this work impact areas of nuclear physics from nuclear structure to fundamental symmetry tests within the actinides. The development portion of laser resonance ionization mass spectrometry program advances technology and develops techniques to make isotopes of the actinide elements more accessible both in intensity as well as purity for subsequent high resolution studies by nuclear structure and high resolution laser spectroscopy. The focus for the coming years is to refine an “ion-guide laser ion source” and to capitalize on the time structure of our resonance ionization technique with pulsed laser sources. This will allow for the systematic investigation of isotope chains in astatine, radium and the actinides.The funds requested are to cover the stipend of up to 2 graduate students (1 Ph.D. and 1 M.Sc.) as well as the required buyout of their teaching at their home institutions. In addition travel cost associated with both conference attendance and collaboration meetings are included. Within Canada this is a collaboration between the University of Manitoba and TRIUMF. On an international scale there exists a strong collaboration with the University of Mainz, the University Oldenburg, University of Applied Sciences Emden/Leer, KU Leuven on the University side, and CERN-ISOLDE (Switzerland), GANIL (France) and JYFL (Finnland) which includes frequent exchange of students and collaborative developments.

“放射性同位素的激光共振电离质谱学”项目旨在调查At、Ra、Ac以及许多以前从未测量过的鳗系元素的同位素光学同位素位移的趋势。激光共振电离作为一种高灵敏度、高选择性的痕量探测方法，可以探测原子核的基态和长寿命同质异构态的核结构。与能够获取大量特定元素同位素的放射性离子束设施相结合，这项技术可以用来绘制从稳定性到滴流线的核结构演变图。核信息是通过探测原子核的原子电子的激光光谱学来获取的。这种相互作用是一种灵敏的、非破坏性的探测器，允许以一种基本上独立于模型的方式提取微妙的核效应。可测量的特殊核性质是：核自旋、磁偶极矩和电四极矩，以及核链中特定元素的同位素均方根电荷半径的变化。在某些情况下，也可以提取诸如磁八极矩之类的高阶效应。这项工作的结果影响了从核结构到基本对称性测试的核物理领域。激光共振电离质谱学计划的开发部分促进了技术的进步，并开发了一些技术，以便在强度和纯度方面更容易地获得鳗系元素的同位素，以便随后通过核结构和高分辨率激光光谱学进行高分辨率研究。未来几年的重点是改进“离子导引激光离子源”，并利用我们的脉冲激光共振电离技术的时间结构。这将允许系统地研究锶、镭和放射性元素中的同位素链。所需资金将用于支付最多2名研究生(1名博士和1名硕士)的津贴。以及所需的买断他们在本国机构的教学费用。此外，还包括与出席会议和协作会议有关的旅费。在加拿大，这是马尼托巴大学和TRIUMF之间的合作。在国际范围内，与美因茨大学、奥尔登堡大学、应用科学大学Emden/Leer、大学方面的KU Leuven以及CERN-Isolde(瑞士)、GANIL(法国)和JYFL(芬兰)开展了强有力的合作，包括频繁的学生交流和合作发展。