Results 11 to 20 of about 1,787,488 (253)
Positron annihilation lifetime spectroscopy at a superconducting electron accelerator [PDF]
Journal of Physics: Conference Series, 2017 The Helmholtz-Zentrum Dresden-Rossendorf operates a superconducting linear accelerator for electrons with energies up to 35 MeV and average beam currents up to 1.6 mA.
Andreas Wagner +10 more
semanticscholar +8 more sources
Positron-Annihilation Lifetime Spectroscopy using Electron Bremsstrahlung [PDF]
Journal of Physics: Conference Series, 2015 A new type of an intense source of positrons for materials research has been set up at the superconducting electron linear. The source employs hard X-rays from electron- bremsstrahlung production generating energetic electron-positron pairs inside the sample under investigation. CW-operation allows performing experiments with significantly reduced pile-
Wagner, A. +7 more
openaire +4 more sources
Single-shot positron annihilation lifetime spectroscopy using a liquid scintillator [PDF]
AIP Advances, 2021 Liquid scintillators provide a fast, single component response. However, they traditionally have a low flashpoint and high vapor pressure. We demonstrate the use of an EJ-309 scintillator (high flashpoint and low vapor pressure variant) to acquire single-
Joshua R. Machacek +2 more
doaj +2 more sources
Ultrashort, MeV-scale laser-plasma positron source for positron annihilation lifetime spectroscopy [PDF]
Physical Review Accelerators and Beams, 2021 Submicron defects represent a well-known fundamental problem in manufacturing since they can significantly affect performance and lifetime of virtually any high-value component. Positron annihilation lifetime spectroscopy is arguably the only established
Thomas L. Audet +12 more
doaj +3 more sources
Positron Lifetime Spectroscopy of Nanocrystalline Copper [PDF]
Acta Physica Polonica A, 1999 Positron lifetime spectroscopy was applied to investigate the thermal stability of nanocrystalline copper prepared by severe plastic torsion deformation. Positrons annihilating in as prepared specimens exhibited free positron component τ1 and two defect components r2 = 164 ps and r3 = 255 ps.
J. C̆ížek +4 more
openaire +2 more sources
Au/GaAs interface annealing study by positron-lifetime spectroscopy [PDF]
Physical Review B, 1995 Structural changes of annealed Au contacts on semi-insulating GaAs have been observed by conventional positron lifetime-spectroscopy in which a significant fraction of positrons are drifted from a $^{22}\mathrm{Na}$ source to the contact by an electric field. For annealing temperatures below 200 \ifmmode^\circ\else\textdegree\fi{}C it is found that the
Wang, YY +4 more
openaire +6 more sources
Commissioning of the J-PET detector in view of the positron annihilation lifetime spectroscopy [PDF]
Hyperfine Interactions, 2018 The Jagiellonian Positron Emission Tomograph (J-PET) is the first PET device built from plastic scintillators. It is a multi-purpose detector designed for medical imaging and for studies of properties of positronium atoms in porous matter and in living ...
K. Dulski +33 more
semanticscholar +3 more sources
Positron annihilation lifetime spectroscopy study of Kapton thin foils [PDF]
, 2016 Variable energy positron annihilation lifetime spectroscopy (VE-PALS) experiments on polyimide material Kapton are reported. Thin Kapton foils are widely used in a variety of mechanical, electronic applications. PALS provides a sensitive probe of vacancy-
G. Kanda +4 more
semanticscholar +2 more sources
Sintering of CuO investigated by positron lifetime spectroscopy
Journal of Materials Science, 1991 The sintering process of CuO under isochronal annealing has been investigated by positron lifetime spectroscopy. A long-lived component of 370±20 psec, observed in as-pressed samples and samples annealed at T≤900 K, has been attributed to continuous channels along three-grain junctions.
Pareja, R. +2 more
openaire +3 more sources
Positron annihilation lifetime spectroscopy at a superconducting electron accelerator [PDF]
, 2023 The Helmholtz-Zentrum Dresden-Rossendorf operates a superconducting linear accelerator for electrons with energies up to 35 MeV and average beam currents up to 1.6 mA.
Wagner, A. +10 more
core +4 more sources