利用β+发射器的单样品正电子湮没光谱

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

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-09-17 DOI:10.1016/j.nima.2025.171013

Roland Prossinger, Leon Chryssos, Sebastian Vohburger, Christoph Hugenschmidt

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引用次数: 0

摘要

我们提出了一种新的基于同位素的样品源设置，可以使用正电子对单个样品进行批量缺陷研究。为此，我们采用了正电子发射体22Na（活度为7 MBq），并对我们的重合多普勒增宽光谱仪（CDBs）进行了改进。与传统正电子湮灭光谱（PAS）中常用的夹芯几何结构（将正电子发射器放置在两个“相同”样品之间）相比，新的单样品装置具有三个主要优点：(i)只需要一个样品，（ii）不检测到源本身或其支持材料产生的湮灭辐射，即不存在源成分，以及（iii）从正电子源发射的不需要的γ辐射（22Na的情况下为1275 keV γ量子）被有效抑制。通过对比夹层法和30 keV正电子束流记录的光谱，在单晶铜上用重合多普勒增宽光谱（CDBS）证明了这三个主要改进。不存在卡普顿源成分，得到了体铜的纯谱。

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Single-specimen Positron Annihilation Spectroscopy using β+ emitters

We present a new isotope-based sample-source setup to enable bulk defect studies on single samples using positrons. For this technique, we employ the positron emitter ²²Na (activity of 7 MBq) and modified our Coincidence Doppler Broadening Spectrometer (CDBs). Compared to the commonly used sandwich geometry, where the positron emitter is placed between two “identical” samples for conventional Positron Annihilation Spectroscopy (PAS), the new single specimen setup offers three major advantages: (i) only a single sample is required, (ii) annihilation radiation originating from the source itself or its supporting material is not detected, i.e., there is no source component, and (iii) unwanted

γ

-radiation emitted from the positron source (1275 keV

γ

-quanta in the case of ²²Na) is efficiently suppressed. These three major improvements are demonstrated with Coincidence Doppler Broadening Spectroscopy (CDBS) on single-crystalline copper by comparing spectra recorded with both the sandwich method and a 30 keV positron beam. The Kapton source component is absent and a pure spectrum of bulk copper is obtained.

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.