Results 51 to 60 of about 442,874 (245)
On the formation of trappable antihydrogen
New Journal of Physics, 2018 The formation of antihydrogen atoms from antiprotons injected into a positron plasma is simulated, focussing on the fraction that fulfil the conditions necessary for confinement of anti-atoms in a magnetic minimum trap.
S Jonsell, M Charlton
doaj +1 more source
Positron Emulator for Commisioning ILC Positron Source [PDF]
Proceedings of the 2005 Particle Accelerator Conference, 2006 The gamma-ray based positron source [1] is an attractive option for the International Linear Collider (ILC) positron option because of the less stringent target requirement and the possibility to provide polarization. The drawback is the fact that the positron accelerator system including positron linac and damping ring can not be fully commissioned ...
H. Wang, W. Liu, W. Gai, K-J. Kim
openaire +1 more source
Positron trapping in semiconductors [PDF]
Physical Review B, 1990 Positron trapping into vacancies in semiconductors is studied on the basis of Fermi's golden-rule calculations. The emphasis is put on the comparison of the trapping properties into defects in different charge states. In particular, the temperature dependences are investigated.
Puska, M. J. +2 more
openaire +3 more sources
Dark matter “transporting” mechanism explaining positron excesses [PDF]
Journal of High Energy Physics, 2017 We propose a novel mechanism to explain the positron excesses, which are observed by satellite-based telescopes including PAMELA and AMS-02, in dark matter (DM) scenarios.
Doojin Kim, Jong-Chul Park, Seodong Shin
semanticscholar +1 more source
Oléagineux, Corps gras, Lipides, 2011 Docosahexaenoic acid (DHA) is critical for normal brain structure and function, and its brain concentration depends on dietary DHA content and hepatic conversion from its dietary derived n-3 precursor, a-linolenic acid (α-LNA).
Rapoport Stanley I. +2 more
doaj +1 more source
Research Progress of Melanoma Imaging with Radionuclide Agents
Journal of Isotopes, 2015 In comparison with CT, ultrasonography, MRI et al, scintigraphic imaging have the advantages of high specificity and recognizes lesions and structure-function of the receptor and metabolism in molecular level, which could diagnose melanoma and its ...
YOU Qiang +3 more
doaj +1 more source
High Efficiency Cyclotron Trap Assisted Positron Moderator
Instruments, 2018 We report on the realisation of a cyclotron trap assisted positron tungsten moderator for the conversion of positrons with a broad keV–few MeV energy spectrum to a mono-energetic eV beam with an efficiency of 1.8(2)% defined as the ratio of the ...
Lars Gerchow +11 more
doaj +1 more source
Anomalous magnetic moment of the positronium ion
New Journal of Physics, 2014 We determine the gyromagnetic factor of the positronium ion, a three-body system consisting of two electrons and a positron, including first relativistic corrections. We find that the g -factor is modified by a term $-0.51\left( 1 \right){{\alpha }^{2}}$
Yi Liang +2 more
doaj +1 more source
The scattering of positrons by electrons with exchange on Dirac’s theory of the positron [PDF]
Proceedings of the Royal Society of London. Series A - Mathematical and Physical Sciences, 1936 It has been shown by Mott that exchange effects play a considerable part in the collision and consequent scattering of one electron by another. Mott’s original calculation was non-relativistic, and there the exchange effect vanishes when the two electrons have their spins pointing in opposite directions.
openaire +1 more source
Assessment of resting myocardial blood flow in regions of known transmural scar to confirm accuracy and precision of 3D cardiac positron emission tomography [PDF]
, 2023 Robert Bober +3 more
openalex +1 more source