Results 1 to 10 of about 55,721 (192)

Positron Annihilation Lifetime Spectroscopy Insight on Free Volume Conversion of Nanostructured MgAl₂O₄ Ceramics [PDF]

Nanomaterials, 2021
Herein we demonstrate the specifics of using the positron annihilation lifetime spectroscopy (PALS) method for the study of free volume changes in functional ceramic materials.
Halyna Klym, Ivan Karbovnyk, Sergei Piskunov, Anatoli I. Popov   +3 more
doaj   +2 more sources

Integrated anti-electronics for positron annihilation spectroscopy [PDF]

Scientific Reports
Imaging the features of a sample using Positron Annihilation Spectroscopy (PAS) is currently achieved by rastering, i.e. by scanning the sample surface with a sharply focused positron beam.
Francesco Guatieri
doaj   +2 more sources

Positron annihilation in boron nitride [PDF]

Condensed Matter Physics, 2006
Electron and positron charge densities are calculated as a function of position in the unit cell for boron nitride. Wave functions are derived from pseudopotential band structure calculations and the independent particle approximation (IPM), respectively,
N.Amrane
doaj   +2 more sources

Positron Transport and Annihilation in the Galactic Bulge [PDF]

Galaxies, 2018
The annihilation of positrons in the Milky Way Galaxy has been observed for ∼50 years; however, the production sites of these positrons remains hard to identify.
Fiona Helen Panther
doaj   +2 more sources

Efficient and surface site-selective ion desorption by positron annihilation [PDF]

Scientific Reports, 2018
We compared positron- and electron-stimulated desorption (e+SD and ESD) of positive ions from a TiO2(110) surface. Although desorption of O+ ions was observed in both experiments, the desorption efficiency caused by positron bombardment was larger by one
Takayuki Tachibana, Takashi Yamashita, Masaru Nagira, Hisakuni Yabuki, Yasuyuki Nagashima   +4 more
doaj   +2 more sources

Anomalous Positron Lifetime in Single Crystal of Weyl Semimetal CoSi

Crystals, 2023
The positron annihilation lifetimes were measured using a 48V positron source in noncentrosymmetric cubic single crystals of CoSi, FeSi and MnSi. The following lifetimes were determined from the positron annihilation time spectra: 168(1) ps for CoSi, 114(
D. A. Salamatin, A. V. Bokov, M. G. Kozin, I. L. Romashkina, A. V. Salamatin, M. V. Mikhin, A. E. Petrova, V. A. Sidorov, A. V. Nikolaev, Z. Fisk, A. V. Tsvyashchenko   +10 more
doaj   +1 more source

Positron annihilation studies of Eurofer97/ODS steels after helium ion implantation

Nuclear Materials and Energy, 2023
The paper briefly reviews our positron annihilation studies performed on Eurofer97 steel and its ODS variant, performed in the last about 20 years. Various aspects of radiation environments foreseen for these materials were experimentally simulated via ...
Vladimir Slugen, Jana Simeg Veternikova, Jarmila Degmova, Stanislav Sojak, Martin Petriska, Pavol Noga, Vladimir Krsjak   +6 more
doaj   +1 more source

Influence of interference signals on spectrometer and measurement results in positron annihilation lifetime measurements

He jishu, 2023
BackgroundThe accurate acquisition and correlation coincidence of positron annihilation signal form the basis of the lifetime spectrum sensitive characterization of microscopic defects in materials.
WANG Lei, PENG Xionggang, ZHANG Hongqiang, YU Runsheng, ZHANG Peng, WU Haibiao, WU Yaru, WANG Baoyi, CAO Xingzhong, XIAO Detao, LIU Fuyan   +10 more
doaj   +1 more source

Methodology and Algorithm of Multicomponent Analysis of Positron Annihilation Spectra for Nanostructured Functional Materials [PDF]

Журнал нано- та електронної фізики, 2017
Methodology for treatment of positron annihilation lifetime spectra by LT computer program in the nanostructured ceramic materials was proposed. Features of mathematical description of annihilation spectra was demonstrated. The algorithm for selection of
H.I. Klym, A.I. Ivanusa, Yu.M. Kostiv, D.O. Chalyy, T.I. Tkachuk, R.B. Dunets, I.I. Vasylchyshyn   +6 more
doaj   +1 more source

Constraints on heavy dark matter annihilation and decay from electron and positron cosmic ray spectra

SciPost Physics Proceedings, 2023
Annihilation or decay of dark matter (DM) could contribute to the electron and positron cosmic-ray flux, allowing for constraints on DM parameters from its measurement.
Holger Motz
doaj   +1 more source