On the Applicability of 48V in Positron Annihilation Lifetime Spectroscopy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-08-29 DOI:10.1109/TNS.2024.3451618

Mircea Lechintan;Nikolay Djourelov

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Abstract

The applicability of the 48V isotope as a source of positrons for positron annihilation lifetime spectroscopy (PALS) measurements is discussed. It has been demonstrated that using such a positron source, the classical PALS setup with two detectors does not accurately determine the positron annihilation parameters of the samples being studied. This issue arises when one of the two nuclear gamma rays (of energies of 983 and 1312 keV) that are emitted almost simultaneously with the creation of a positron triggers a start signal, while the other nuclear gamma triggers a stop signal instead of the 511-keV annihilation quanta. These events manifest as prompt coincidences in the start-stop histogram, rendering the analysis of PALS spectra unreliable. To address this problem, a modification to the classical PALS spectrometer was proposed and tested. This modification involved incorporating a logic branch that significantly reduced the undesired prompt coincidences between the 983- and 1312-keV gamma rays. By conducting measurements on a series of samples utilizing 2- and 25-

$\mu $

m-thick Ti foils enriched with 48V, it was demonstrated that the altered setup reliably extracts accurate information on the positron annihilation states within the samples being examined.

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论 48V 在正电子湮没寿命光谱中的适用性

本文讨论了 48V 同位素作为正电子源用于正电子湮灭寿命光谱（PALS）测量的适用性。实验证明，使用这样的正电子源，带有两个探测器的经典 PALS 设置无法准确测定所研究样品的正电子湮灭参数。当几乎与正电子产生同时发射的两束核伽马射线（能量分别为 983 和 1312 千伏安）中的一束触发一个启动信号，而另一束核伽马射线触发一个停止信号，而不是 511 千伏安的湮灭量子时，就会出现这个问题。这些事件在起始-停止直方图中表现为迅速的重合，使 PALS 光谱分析变得不可靠。为了解决这个问题，我们提出并测试了对经典 PALS 光谱仪的改进。这一改进包括加入一个逻辑分支，以显著减少 983-keV 和 1312-keV 伽马射线之间不希望出现的瞬时重合。通过对一系列使用 2 和 25- $\mu $ m 厚的富含 48V 的钛箔的样品进行测量，证明了改变后的设置能够可靠地提取被测样品中正电子湮灭状态的准确信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.