Precision measurements with trapped radioactive ions using the Canadian Penning Trap Mass spectrometer and associated ion traps at the Argonne National Laboratory

使用阿贡国家实验室的加拿大彭宁阱质谱仪和相关离子阱对捕获的放射性离子进行精确测量

• 批准号: SAPPJ-2015-00034
• 负责人: Sharma, Kumar
• 金额: $ 10.2万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=614421
• 关键词: Precision; measurements; trapped; radioactive; ions

Precision measurements of the atomic masses of nuclides far from stability provide information on the energy released in the decay and nuclear reactions involving these exotic, short-lived, nuclei. The results are an important ingredient in predicting the rates and pathways of nuclear reactions that power explosive astrophysical events thought to be responsible for the nucleosynthesis of the heavier elements (through the rp-, nu-p- and r-processes). The data also provides a view of nuclear structure in regions where the nuclei have extreme neutron to proton ratios and, provide an opportunity for the study of fundamental symmetries in particle physics theories. Currently, The Canadian Penning Trap Mass Spectrometer (CPT) is being used to measure the masses of very neutron-rich isotopes that lie on or near the expected reaction path for the astrophysical r-process, a region that lies near the edge of nuclear stability called the "neutron dip line". The nuclei of interest are provided by the CARIBU (Californium Radioactive Ion Beam Upgrade) facility at the Argonne Tandem Linear Accelerator System (ATLAS) at the Argonne National Laboratory. The exotic, neutron-rich, atoms are produced by spontaneous fission, in a 1.7 Ci, 252Cf fission source and delivered (with a few keV of energy) to the CPT for a precise measurement of their mass. Alternately, the ions can also be transferred to a radio-frequency quadrupole ion trap (RFQ) where they are suspended in helium gas. Such a cloud of exotic nuclei, nearly at rest, provides a unique opportunity to study the correlations between the beta particles, the neutrinos and other particles emitted in their decay and test symmetries in particle physics theories. The amount requested will cover the operation and maintenance costs of the Canadian Penning Trap mass spectrometer (which is entirely Canadian owned), 3 graduate student stipends , the salary for a post-doctoral fellow and, travel costs to and from the facility. This work is carried out in collaboration with J. Clark and G. Savard, Physics Division, Argonne National Laboratory, Ralph Segel, Northwestern University, Nicholas Scielzo, Lawrence Livermore National Laboratory and Ani Aprahamian from Notre Dame University, all from the USA.

远离稳定性的核素原子质量的精确测量提供了有关腐烂和核反应中释放的能量的信息，这些能量涉及这些异国情调，短暂的核。结果是预测核反应的速率和途径的重要组成部分，这些核反应爆炸性天体物理事件被认为是造成较重元件（通过RP-，NU-P-和R-Processes）的核合成的原因。该数据还提供了核具有极端中子与质子比的区域中的核结构的视图，并为研究粒子物理理论的基本对称性提供了机会。 目前，加拿大笔陷阱质谱仪（CPT）用于测量位于天体物理R-Process的预期反应路径上或附近的非常中子的同位素的质量，该区域位于该区域，该区域位于核稳定性边缘，称为“中子浸入线”。感兴趣的核由Argonne国家实验室的Argonne Tandem线性加速器系统（ATLAS）的加州（加州放射性离子束升级）设施提供。异国情调的，富含中子的原子是通过自发裂变产生的，在1.7 CI，252CF裂变源中，并将其（带有几个能量的能量）传递到CPT，以精确测量其质量。或者，也可以将离子转移到射频四极离子陷阱（RFQ）中，在那里它们被悬浮在氦气中。这种外来核的云几乎静止，为研究β颗粒，中微子和其他衰变中发出的中微子和其他颗粒之间的相关性提供了独特的机会，并在粒子物理学理论中测试了对称性。 所需的金额将涵盖加拿大笔陷阱质谱仪的运营和维护成本（完全是加拿大人拥有），3名研究生津贴，一名博士后研究员的薪水以及往返于该设施的旅行费用。 这项工作与J. Clark和G. Savard合作，物理部，Argonne National Laboratory，Ralph Segel，Northwestern University，Nicholas Scielzo，Notre Dame University的Nicholas Scielzo，Nicholas Scielzo，Lawrence Livermore国家实验室和AniAprahamian。