Zeolite‐Based Catalysts for Conversion of Oxygenated Polymer Waste by Positron Annihilation
Sign Up to like & getrecommendations! Published in 2024 at "ChemCatChem"
DOI: 10.1002/cctc.202301282
Abstract: Positron Annihilation Lifetime Spectroscopy (PALS) has been employed to investigate the catalysts HZSM‐5 and MESO−Y, which play a pivotal role in catalyzing and upgrading plastics, with a primary focus on oxygenated polymers, thereby transforming existing… read more here.
Keywords: positron; catalysts conversion; based catalysts; zeolite based ... See more keywords
Experimental investigation of the characteristics of radioactive beams for heavy ion therapy.
Sign Up to like & getrecommendations! Published in 2020 at "Medical physics"
DOI: 10.1002/mp.14177
Abstract: PURPOSE This work has two related objectives. The first is to estimate the relative biological effectiveness of two radioactive heavy ion beams based on experimental measurements, and compare these to the relative biological effectiveness of… read more here.
Keywords: ion beams; positron; phantom; depth maximum ... See more keywords
Motion tracking of low-activity fiducial markers using adaptive region-of-interest with list-mode positron emission tomography.
Sign Up to like & getrecommendations! Published in 2020 at "Medical physics"
DOI: 10.1002/mp.14206
Abstract: PURPOSE Motion compensated positron emission tomography (PET) imaging requires detecting and monitoring of patient body motion. We developed a semiautomatic list-mode method to track the three-dimensional (3D) motion of fiducial positron-emitting markers during PET imaging.… read more here.
Keywords: positron; motion; pet imaging; list mode ... See more keywords
Evaluating the impact of different positron emitters on the performance of a clinical PET/MR system.
Sign Up to like & getrecommendations! Published in 2022 at "Medical physics"
DOI: 10.1002/mp.15513
Abstract: PURPOSE The positron range and prompt gamma emission are distinctive with different positron emitters. The performance assessment of an integrated PET/MR scanner with these positron emitters is required for related applications, as the magnetic field… read more here.
Keywords: pet system; positron emitters; positron; different positron ... See more keywords
New physics searches at the ILC positron and electron beam dumps
Sign Up to like & getrecommendations! Published in 2021 at "Journal of High Energy Physics"
DOI: 10.1007/jhep09(2021)183
Abstract: Abstract We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are… read more here.
Keywords: physics; new physics; beam dump; electron ... See more keywords
Dynamic behavior of positron acoustic multiple-solitons in an electron–positron-ion plasma
Sign Up to like & getrecommendations! Published in 2024 at "Optical and Quantum Electronics"
DOI: 10.1007/s11082-024-06289-8
Abstract: We explore the dynamic characteristics of positron acoustic multiple-solitons in an unmagnetized plasma containing mobile cold positrons, Kappa-distributed superthermal hot electrons and positrons, and stationary positive ions. This study investigates the overtaking collisional effects, various… read more here.
Keywords: positron; acoustic multiple; positron acoustic; positron ion ... See more keywords
Short positron lifetime at vacancies observed in electron-irradiated tungsten: Experiments and first-principles calculations
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Nuclear Materials"
DOI: 10.1016/j.jnucmat.2020.152473
Abstract: Abstract A positron lifetime component of ∼ 170 ps has been reported for irradiated tungsten (W) in some studies. This value is considerably shorter than that calculated for isolated monovacancies ( ∼ 200 ps). In this study, positron annihilation lifetime… read more here.
Keywords: positron; electron irradiated; positron lifetime; lifetime ... See more keywords
Size effect in nonstoichiometric titanium monoxide and vanadium carbide nanocrystals measured by positron lifetime spectroscopy
Sign Up to like & getrecommendations! Published in 2019 at "Mendeleev Communications"
DOI: 10.1016/j.mencom.2019.09.002
Abstract: A size effect in nonstoichiometric titanium monoxide TiOy and vanadium carbide VCy nanocrystals containing high concentrations of structural vacancies was detected by electron-positron annihilation. The effect consists of a considerable increase in the positron lifetime… read more here.
Keywords: positron; positron lifetime; size effect; spectroscopy ... See more keywords
Solid standards for positron emitters
Sign Up to like & getrecommendations! Published in 2020 at "Radiation Physics and Chemistry"
DOI: 10.1016/j.radphyschem.2019.05.017
Abstract: Abstract Hypothesis Positron Emission Tomography is a well establish technique to obtain physiological information of a patient or a process. In order to guarantee all the benefits of this technique it is important to establish… read more here.
Keywords: standards positron; solid standards; geometry; metrology ... See more keywords
Rotational excitation of O2 by positron impact
Sign Up to like & getrecommendations! Published in 2021 at "Radiation Physics and Chemistry"
DOI: 10.1016/j.radphyschem.2020.109140
Abstract: Abstract We report the rotational excitation of O2 molecule by positron impact for energies between 0.01 and 5.0 eV. The T-matrices were obtained by the method of continued fractions within the positron correlation-polarisation potential considering different… read more here.
Keywords: rotational excitation; positron; polarisation potential; positron impact ... See more keywords
Electron capture by vacancy-type defects in carbon-doped GaN studied using monoenergetic positron beams
Sign Up to like & getrecommendations! Published in 2017 at "Thin Solid Films"
DOI: 10.1016/j.tsf.2017.08.021
Abstract: Abstract Vacancy-type defects in GaN with different carbon concentrations ([C] = 2 × 1016 − 1 × 1018 cm− 3) were probed using monoenergetic positron beams. 1.5-μm-thick GaN layers were grown on Si substrates by metalorganic vapor phase epitaxy. Measurements of Doppler broadening spectra and… read more here.
Keywords: positron; monoenergetic positron; type defects; using monoenergetic ... See more keywords