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Positron annihilation
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In the paper, zeolite ZSM-5 has been synthesized in laboratory. Its structure is then modified by irradiating with electron beam at the different energies and fluences (F). To perform the irradiation process on the electron beam (EB) linear accelerator (UERL-10-15S2), the simultaneous energy degrading and sample containing holde was calculated and designed by MCNP simulation before irradiation.
7p
vicedric
08-02-2023
8
3
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Positron annihilation is of great interest for applications in evaluating material structures in range from a few angstroms to hundreds of nanometers. Here, we report on a new model for calculating the free volume size in porous materials from the experimental ortho-Positronium (o-Ps) lifetimes reported and updated over than past four decades by the combination of the quantum and semi-classical physics models.
8p
vicedric
08-02-2023
3
3
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GEANT4 (GEometry ANd Tracking) is an object-oriented Monte Carlo simulation toolkit to simulate the passage of particles through matter. This research was carried out to model a system for measuring positron lifetime in materials by GEANT4 whereby the nature of positron annihilation in material was understood clearly.
6p
visnape
30-01-2023
8
2
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Comprehensive ex-situ and in-situ investigations of thermal curing processes in spin-on ultra-low-k thin films conducted by positron annihilation spectroscopy and Fourier transform infrared spectroscopies are presented. Positron annihilation lifetime spectroscopy of ex-situ cured samples reveals an onset of the curing process at about 200 ◦C, which advances with increasing curing temperature.
10p
vironald
15-12-2022
4
2
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This is mainly due to the appearance of a rod like structure on neat PS which has improved the dispersion as well as provides a higher interface area that enhanced the UV-absorption efficiency of the PS matrix. This analysis is equally supported by the PALS study where the free volume was closely associated with the interfacial interaction between the filler and the PS matrix.
7p
tamynhan4
06-09-2020
5
1
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Measurement system for determination of positron annihilation rate is consisted of HPGe detector, multichannel analyser and Na22 positron source. The result of annihilation rate measurement in wetted filter paper is treated. The formula of energy transfer model is used for explanation obtained data quantitatively.
3p
12120609
01-06-2020
4
0
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In this study, we investigated the microstructure of such doped fuels as well as a reference standard UO2 by positron annihilation spectroscopy (PAS). Although this technique is particularly sensitive to lattice point defects in materials, a wider application in the UO2 research is still missing.
5p
christabelhuynh
30-05-2020
5
1
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Positron annihilation spectroscopy (PAS) is a method dedicated to detection of openvolume type of defects. Nowadays, this technique is of a great interest due to the practical character of obtained results. New devices using monoenergetic positron beams are built. The paper presents the basics of PAS, a description of common experimental techniques and two examples of applications.
10p
capheny
28-02-2020
16
0
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In this paper we present the QED photonic radiative corrections of the e+ e- → tt¯ process by using the factorization of ISR and GRACE system as a numerical calculation method.
9p
danhnguyentuongvi
18-12-2018
11
1
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The document presents the basic contents: Basic interaction between radiation and matter, spectral distribution of electromagnetic radiation, Interactions between electromagnetic radiations and matter, photoelectric effect, photoelectric effect, coherent scattering, electron-positron annihilation, discovering atomic structure, scattering of alpha particle, Bragg-curve,...invite you to refer
7p
catbuitheogiobay
19-03-2018
36
1
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Defect Characterization in SiGe/SOI Epitaxial Semiconductors by Positron Annihilation
6p
dauphong14
11-02-2012
31
5
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