Investigating the properties of ortho-positronium in liquid scintillators under oxygen quenching

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Applied Radiation and Isotopes Pub Date : 2024-07-29 DOI:10.1016/j.apradiso.2024.111459

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Abstract

Investigating the mechanism of positron annihilation in liquid-scintillator based neutrino experiments could be helpful for positron reconstruction algorithms and positron-electron discrimination analysis. Based on this, we utilize a novel positron annihilation lifetime spectrometer to characterize a series of liquid scintillator samples without direct contact with the positron source by applying the anti-coincidence method, which facilitates the measurement of liquids with high accuracy and low background. We obtain an ortho-positronium (o-Ps) lifetime value of 3.02 ns for liquid scintillators composed of linear alkylbenzene and two solutes, and we also measure liquid scintillator samples by bubbling different gases to study the interaction of oxygen dissolved with positronium. The discussion of the annihilation behavior of o-Ps in liquid scintillators further clarify the factors affecting the lifetime and intensity of o-Ps, and the calculation of annihilation rate and free volume radius within the samples has potential applications in characterizing gas solubility and free volume in liquids with o-Ps as probe.

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研究氧淬火条件下液体闪烁体中正电子的特性。

研究基于液体闪烁体的中微子实验中的正电子湮灭机制有助于正电子重建算法和正电子-电子辨别分析。在此基础上，我们利用新型正电子湮灭寿命谱仪，采用反共振法对一系列液体闪烁体样品进行了表征，而无需直接接触正电子源，从而实现了高精度、低背景的液体测量。我们得到了由线性烷基苯和两种溶质组成的液体闪烁体的正负电子寿命值为 3.02 ns，我们还测量了鼓泡不同气体的液体闪烁体样品，以研究溶解氧与正电子的相互作用。对 o-Ps 在液体闪烁体中的湮灭行为的讨论进一步阐明了影响 o-Ps 寿命和强度的因素，而湮灭率和样品内自由体积半径的计算在以 o-Ps 为探针表征液体中气体溶解度和自由体积方面具有潜在的应用价值。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.