Results 31 to 40 of about 558,215 (330)

A Method to Measure Positron Beam Polarization Using Optically Polarized Atoms

Atoms, 2023
We outline an experimental technique for measuring the degree of polarization of a positron beam using an optically pumped, spin-polarized Rb target. The technique is based on the production and measurement of the ortho- and para-positronium fractions ...
Joshua R. Machacek, Sean Hodgman, Stephen Buckman, T. J. Gay   +3 more
doaj   +1 more source

Positron-Induced Luminescence [PDF]

Physical Review Letters, 2018
We report on the observation that low-energy positrons incident on a phosphor screen produce significantly more luminescence than electrons do. For two different wide-band-gap semiconductor phosphors (ZnS:Ag and ZnO:Zn), we compare the luminescent response to a positron beam with the response to an electron beam.
Stenson, E. V., Hergenhahn, U., Stoneking, M. R., Pedersen, T. Sunn   +3 more
openaire   +3 more sources

Hypernovae and light dark matter as possible Galactic positron sources [PDF]

, 2004
The electron-positron annihilation source in the Galactic center region has recently been observed with INTEGRAL/SPI, which shows that this 511 keV source is strong and its extension is consistent with the Galactic bulge geometry. The positron production
Casse, M., Cordier, B., Paul, J., Schanne, S.   +3 more
core   +5 more sources

Simulations of slow positron production using a low energy electron accelerator

, 2011
Monte Carlo simulations of slow positron production via energetic electron interaction with a solid target have been performed. The aim of the simulations was to determine the expected slow positron beam intensity from a low energy, high current electron
A. Kinomura, B. E. O’Rourke, Charlton M., E. J. Minehara, Hayashizaki N., N. Hayashizaki, N. Oshima, Okada S., R. Kuroda, R. Suzuki, T. Ohdaira   +10 more
core   +1 more source

Calculation of the positron bound state with the copper atom [PDF]

, 1999
A new relativistic method for calculation of positron binding to atoms is presented. The method combines a configuration interaction treatment of the valence electron and the positron with a many-body perturbation theory description of their interaction ...
C. Harabati, C. M. Marian, C. W. BauschlicherJr., D. C. Clary, F. H. Gertler, G. F. Gribakin, G. F. Gribakin, G. G. Ryzhikh, G. G. Ryzhikh, G. G. Ryzhikh, G. G. Ryzhikh, G. G. Ryzhikh, G. G. Ryzhikh, G. G. Ryzhikh, H. Hotop, I. Aronson, I. Bray, J. Mitroy, J. Mitroy, J. Sapirstein, J. Yuan, K. Strasburger, L. D. Landau, P. Neogrady, P. Schwerdtfeger, R. C. Bilodeau, R. Szmytkowski, R. Szmytkowski, S. J. Ward, V. A. Dzuba, V. A. Dzuba, V. A. Dzuba, V. A. Dzuba, V. A. Dzuba, V. A. Dzuba, V. V. Flambaum   +35 more
core   +2 more sources

The Positronium state in quartz

, 2009
The positronium state in quartz is described by a linear superposition of two states: the first describing the free positron in the crystal and the second corresponding to a positronium Bloch wavefunction in the lattice.
Barbiellini, B., Platzman, P. M.
core   +1 more source

Hypoxia Imaging in Lung Cancer: A PET-Based Narrative Review for Clinicians and Researchers

Pharmaceuticals
Background: Hypoxia plays a critical role in lung cancer progression and treatment resistance by contributing to aggressive tumor behavior and poor therapeutic response.
Ahmad Alenezi, Hamad Alhamad, Aishah Alenezi, Muhammad Umar Khan   +3 more
doaj   +1 more source

Screening for lung cancer: A systematic review of overdiagnosis and its implications

Molecular Oncology, EarlyView.
Low‐dose computed tomography (CT) screening for lung cancer may increase overdiagnosis compared to no screening, though the risk is likely low versus chest X‐ray. Our review of 8 trials (84 660 participants) shows added costs. Further research with strict adherence to modern nodule management strategies may help determine the extent to which ...
Fiorella Karina Fernández‐Sáenz, Laura de la Torre‐Perez, David R Baldwin, Carlijn van der Aalst, Mangesh Thorat, David Ritchie, Andre L Carvalho, Carolina Espina, Ivan Solà, Carlos Canelo‐Aybar, Moira Magdalena Pissinis, Pablo Alonso‐Coello, Ana Carolina Pereira Nunes Pinto   +12 more
wiley   +1 more source

Development of an automated method for in-house production of sodium 18F-fluoride for injection: process validation as a step toward routine clinical application

EJNMMI Radiopharmacy and Chemistry
Background Sodium 18F-fluoride for injection can be easily cyclotron-produced and purified, as a simple inorganic salt, by adsorption/desorption onto an anion-exchange cartridge and then dispensed for clinical use.
Marija Atanasova Lazareva, Maja Chochevska, Katerina Kolevska, Maja Velickovska, Filip Jolevski, Paulina Apostolova, Ana Ugrinska, Emilija Janevik-Ivanovska   +7 more
doaj   +1 more source

Full Potential Linearized Augmented Plane Wave Calculations of Electron and Positron Energy Levels in TlBr and TlCl

Annals of West University of Timisoara: Physics, 2023
Theoretical research was conducted on the energy levels of electrons and positrons in zinc-blend TlBr and TlCl using the first-principle full potential linearized augmented plane wave method based on the gradient generalized approximation GGA.
Bousahla Mohammed Alaa, Bousahla Mohammed Nadir, Bousahla Zouaoui, Khachai Houari, Bendjilali Hadjer, Benkatlane Aissa   +5 more
doaj   +1 more source