使用 SNICS 离子源和加速器质谱仪测量宇宙成因 10Be 时阴极材料对 BeO 电流的影响

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2024-11-17 DOI:10.1016/j.nimb.2024.165562

Atsunori Nakamura , Takeyasu Yamagata , Hiroyuki Matsuzaki

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引用次数: 0

摘要

加速器质谱（AMS）测量 10Be 的精度取决于 Cs 溅射样品中 BeO- 电流的强度。我们进行了一项实验，以确定用于 AMS 测量的阴极材料对 BeO- 电流的影响。不锈钢阴极的峰值电流略高于铜阴极，这表明使用前者测量低浓度样品更有优势。不过，测量时间较长可能会抵消这一微小差异。BeO 电流的差异归因于 BeO 和阴极材料之间的竞争电离。不锈钢中的主要元素铁的电子亲和力明显低于铜，从而减少了 BeO 电离时的电子消耗。这一现象反映了金属基质选择对氧化铍电流强度的影响。这些结果有助于优化 AMS 测量中其他核素的束流，也有利于使用 SNICS 离子源进行的研究。

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Influence of cathode materials on BeO currents in cosmogenic 10Be measurements using a SNICS ion source and accelerator mass spectrometry

The precision of ¹⁰Be measurements by accelerator mass spectrometry (AMS) relies on the intensity of BeO^- currents from Cs-sputtered samples. We conducted an experiment to determine the effect of cathode materials on BeO^- currents for AMS measurements. The peak currents of stainless-steel cathodes were slightly higher than those of Cu cathodes, indicating the benefits of using the former for measuring low-level samples. However, this slight difference may be counteracted by longer measurement times. The difference in the BeO^- currents is attributed to competitive ionization between BeO and cathode materials. Fe, the primary element in stainless steel, has a significantly lower electron affinity compared to Cu, resulting in reduced electron consumption for BeO ionization. This phenomenon mirrors the effect of metal-matrix selection on BeO^- current intensity. These results are relevant for optimizing beam currents of other nuclides in AMS measurements and are beneficial for studies conducted using SNICS ion sources.

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.