Precision measurements with the TITAN ion trap system at ISAC

ISAC 使用 TITAN 离子阱系统进行精确测量

• 批准号: SAPPJ-2018-00015
• 负责人: Dilling, Jens
• 金额: $ 56.82万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718922
• 关键词: Precision; measurements; TITAN; ion; trap

The nucleus at the center of atoms of all known chemical elements in the universe consists of protons and neutrons, which in turn are made up of quarks. The interaction of these constituents is responsible for the stability and structure of the atom, and with that for the resulting abundances of the elements and their isotopes in the universe and on Earth. Information on the stability of atoms can be gained by carrying out precision experiments, such as mass measurements and decay spectroscopy. The mass of an atom and from there the deduced binding energy reflects all subatomic interactions, making it possible to identify how the interaction behaves as a function of neutron and proton number and their combination. Since the advent of rare-beam facilities and dedicated accelerator complexes, the access has been possible to about 3500 isotopes. One of the leading facilities for the production of these rare isotope beams (RIBs) is ISAC (Isotope Separator and Accelerator) at TRIUMF. The availability of more exotic RIBs, with very asymmetric neutron-to-proton ratios, makes it possible to study in much detail the effects of the interaction of the nucleons. Theoretical approaches are building on the very successful Shell Model and are extending to account for phenomena observed in very exotic nuclei. Moreover, other theoretical approaches make use of significant progress in Quantum Chromo Dynamics (QCD) to describe the nuclear interaction from first principles. There is enormous progress in the theoretical field, and the experiments carried out within this proposal aim at studying detailed predictions from these theories. TITAN is involved in providing high precision measurements for super-allowed beta decay and has a program to investigate nuclear structure and the evolution of magic numbers and 3-body effects. Nuclear Astrophysics and the quest to understand the evolution of the chemical elements in the Universe requires deeper understanding of nuclear physics, which can be gained with precision measurements. All scientific quests described here are possible because of the well-established and leading edge performance of the TITAN facility in combination with availability of the relevant isotopes in unprecedented and competitive quantities and quality at the ISAC on-line facility at TRIUMF. In the very near future ARIEL (Advanced Rare IsotopE Laboratory), will be able to almost triple the available experimental opportunities, and provide novel isotope beams. This world-wide unique installation provides for exceptional experimental opportunities for mass measurements and in-trap decay spectroscopy, making use of significant investments in the facility and development of skills and technology of TITAN.

在宇宙中所有已知的化学元素中，原子中心的原子核由质子和中子组成，而质子和中子又由夸克组成。这些成分的相互作用决定了原子的稳定性和结构，从而决定了宇宙和地球上元素及其同位素的丰度。关于原子稳定性的信息可以通过进行精确的实验获得，例如质量测量和衰变光谱。原子的质量和由此推导出的结合能反映了所有亚原子的相互作用，从而有可能确定相互作用如何作为中子和质子数目及其组合的函数。自从稀有光束设施和专用加速器综合体出现以来，已经有可能接触到大约3500种同位素。生产这些稀有同位素束（rib）的主要设施之一是位于TRIUMF的ISAC（同位素分离器和加速器）。有了更多具有非常不对称中子质子比的奇异肋，就有可能更详细地研究核子相互作用的影响。理论方法是建立在非常成功的壳层模型的基础上，并正在扩展到解释在非常奇特的原子核中观察到的现象。此外，其他理论方法利用量子色动力学（QCD）的重大进展，从第一性原理来描述核相互作用。在理论领域有巨大的进步，在这个提议中进行的实验旨在研究这些理论的详细预测。TITAN参与提供超允许β衰变的高精度测量，并有一个研究核结构、幻数演变和三体效应的计划。核天体物理学和探索宇宙中化学元素的演化需要对核物理学有更深入的了解，这可以通过精确的测量来获得。这里所描述的所有科学探索都是可能的，因为TITAN设施的完善和领先性能，以及在TRIUMF的ISAC在线设施中以前所未有的和具有竞争力的数量和质量提供相关同位素。在不久的将来，ARIEL（先进稀有同位素实验室）将能够将现有的实验机会增加近三倍，并提供新的同位素束。这个世界范围内独一无二的装置为质量测量和陷阱内衰变光谱提供了特殊的实验机会，利用了TITAN在设施和技能和技术开发方面的重大投资。