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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=617821
• 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.

位于宇宙中所有已知化学元素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对原子的稳定性和结构负责，并与宇宙和地球上元素及其同位素的丰度有关。通过进行精确的实验，如质量测量和衰变光谱，可以获得原子稳定性的信息。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，从而可以确定这种相互作用是如何作为中子和质子数及其组合的函数来表现的。自从出现了稀有的束流设施和专用的加速器复合体以来，已经有可能获得大约3500个同位素。TRIUMF的ISAC(同位素分离器和加速器)是生产这些稀有同位素束(肋骨)的主要设施之一。具有非常不对称的中质子比的更奇特的肋骨的存在，使得更详细地研究核子相互作用的影响成为可能。理论方法正在建立在非常成功的壳牌模型的基础上，并正在扩展到解释在非常奇怪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描述核相互作用。在理论领域有了巨大的进步，在这个方案中进行的实验旨在研究来自这些理论的详细预测。泰坦致力于为超允许的贝塔衰变提供高精度的测量，并有一个研究双中微子双贝塔衰变的计划，以帮助对无中微子双贝塔衰变的理论框架进行基准测试。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有更深的理解，这可以通过精确测量获得。这里描述的所有科学任务都是可能的，因为泰坦设施成熟和尖端的性能，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获得相关同位素。这一全球独一无二的安装为质量测量和陷阱内衰变光谱提供了特殊的实验机会，利用对泰坦设施和技能和技术开发的重大投资。