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-2015-00037
• 负责人: Dilling, Jens
• 金额: $ 38.46万
• 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: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=591575
• 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 of 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 detail predictions from these theories. TITAN is involved in providing high precision measurements for super-allowed beta decay and has a program to investigate two-neutrino double beta decay, to help benchmark the theoretical framework for neutrino-less double beta decay. 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 ISAC on-line facility at TRIUMF. 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.

原子核位于宇宙中所有已知化学元素的原子中心，由质子和中子组成，而中子又由夸克组成。这些成分的相互作用决定了原子的稳定性和结构，也决定了宇宙和地球上元素及其同位素的丰度。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学。原子的质量和由此推导出的结合能反映了所有的亚原子相互作用，使得有可能确定相互作用如何作为中子和质子数及其组合的函数。自从稀有束设施和专用加速器复合体出现以来，已经有可能获得大约3500种同位素。TRIUMF的ISAC（同位素分离器和加速器）是生产这些稀有同位素束（RIBs）的主要设施之一。更奇特的RIBs的可用性，具有非常不对称的中子质子比，使得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模型，并扩展到解释在非常奇特的核中观察到的现象。此外，其他理论方法利用量子染色体动力学（QCD）的重要进展，从第一性原理描述核相互作用。理论领域取得了巨大的进展，在该提案中进行的实验旨在研究这些理论的详细预测。泰坦参与提供高精度测量超允许的β衰变，并有一个研究双中微子双β衰变的计划，以帮助基准测试无中微子双β衰变的理论框架。核天体物理学和对宇宙中化学元素演化的探索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设施的完善和领先的性能，以及TRIUMF ISAC在线设施前所未有的具有竞争力的数量和质量的相关同位素的可用性。这一世界范围内独一无二的装置为质量测量和阱内衰变光谱学提供了特殊的实验机会，利用了对TITAN设施的重大投资以及技能和技术的发展。