Record high time resolution of positron annihilation lifetime spectrometer achieved by double-stop setup and geometry optimization of scintillators

被引：4

作者：

Li, Y. H. ^{[1
]}

Zhao, Q. H. ^{[1
]}

Dong, Y. ^{[1
]}

Xu, W. ^{[1
]}

Pan, Z. W. ^{[1
]}

Liu, J. D. ^{[1
]}

Zhang, H. J. ^{[1
]}

Ye, B. J. ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2024年 / 1058卷

基金：

中国国家自然科学基金;

关键词：

Geant4; simulation; Time resolution; Positron annihilation lifetime spectrometer; Cone-frustum-shaped scintillator; OXYGEN VACANCIES; GEANT4; SIMULATION; DEFECTS; PROGRAM;

D O I：

10.1016/j.nima.2023.168772

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

To precisely characterize the defects in crystalline solids including semiconductors and alloys, it is critical but challenging to improve the time resolution of positron annihilation lifetime (PAL) spectrometers. The effects of geometry and wrapping of scintillators on the time resolution of the PAL spectrometer were studied in detail. Geant4 program simulation was used to clarify the reason why cone-frustum-shaped scintillators have better time resolution than cylinder-shaped scintillators. A figure of merit was proposed to comprehensively evaluate the impacts of the transport and absorption of fluorescent photons on the time resolution of scintillators. Additionally, for the simulations of cone-frustum-shaped scintillators, polished reflective coatings can further improve the time resolution without losing count rate. Eventually, using three cone-frustum-shaped BaF2 scintillators and a double-stop setup, we significantly improved the time resolution of PAL spectrometer to a new record of 88.7 ps, the best time resolution up to date. This enables us to distinguish various vacancy types in crystalline solids more precisely in future.

引用

页数：10

共 3 条

[1] Record high counting rate of positron annihilation lifetime spectrometer achieved by β+-γ coincidence
Xu, W.
Li, Y. H.
Luo, M.
Liu, J. D.
Ye, B. J.
Zhang, H. J.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2025, 1070
[2] Super high counting rate of positron annihilation lifetime spectrometer achieved via multiple detectors
Dong, Y.
Zhao, Q. H.
Li, Y. H.
Pan, Z. W.
Luo, M.
Liu, J. D.
Zhang, H. J.
Ye, B. J.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2023, 1055
[3] A 64-channel high-time resolution digital waveform sampling electronic system based on DRS4 for positron burst annihilation lifetime measurement
Wang, M.
Bian, Z.
Wang, Y.
Li, D.
Li, X.
Cai, J.
Wang, P.
Wang, B.
Cao, X.
Zhang, Z.
Kuang, P.
Liu, F.
Zhang, H.
Yu, X.
Chen, T.
Yun, X.
Wei, L.
JOURNAL OF INSTRUMENTATION, 2022, 17 (10)

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