Results 81 to 90 of about 4,848 (208)
Fermi surface determination from momentum density projections
New Journal of Physics, 2016 The problem of determining a metal’s Fermi surface from measured projections of the electron or electron/positron momentum densities, such as those obtained by Compton scattering or angular correlation of positron annihilation radiation, respectively, is
Michael Leitner +2 more
doaj +1 more source
Advanced Energy and Sustainability Research, Volume 6, Issue 11, November 2025.By creating anion and cation vacancies, scientists fine‐tune semiconductor bandgaps and extend light absorption, boosting charge separation in photocatalysts. Surface defects enhance reactant adsorption and carrier transport, while controlled bulk defects curb recombination.
Srinath Ranjan Tripathy +1 more
wiley +1 more source
Физика волновых процессов и радиотехнические системы, 2014 The reasons of angular photon distribution occurrence at electron-positron annihilation are considered. It is shown, that angular photon distribution is consequence of Dopplers effect in the reference frame of the electron and positron mass center.
A.N. Volobuev, T.A. Antipova
doaj
Positron Annihilation Studies on Chemically Synthesized FeCo Alloy
Scientific Reports, 2018 Equiatomic flower-like FeCo magnetic nanoparticles are synthesized through a modified one-pot polyol technique. The as-prepared samples are annealed at 700 and 800 °C under reducing atmosphere.
P. Rajesh +4 more
doaj +1 more source
The impact of EDGES 21-cm data on dark matter interactions
Physics Letters B, 2019 The recently announced results on the 21-cm absorption spectrum by the EDGES experiment can place very stringent limits on dark matter annihilation cross sections.
Kingman Cheung +3 more
doaj +1 more source
Journal of Science: Advanced Materials and DevicesMesopores and silanol nests are known two technological keys that essentially control the catalytic performance of ZSM-5 zeolite. However, designing and controlling them without using chemicals so that the produced ZSM-5 can have strongly enhanced ...
La Ly Nguyen +19 more
doaj +1 more source
Electron-positron annihilation into heavy leptons at two loops
Journal of High Energy PhysicsWe calculate the NNLO QED corrections to the C-even part of differential cross section of e + e − → μ + μ − process. We neglect power corrections in the electron mass and obtain the result in terms of Goncharov’s polylogarithms.
Roman E. Gerasimov +2 more
doaj +1 more source
Double Charmonium Productions in Electron-Positron Annihilation Using Bethe-Salpeter Approach
Advances in High Energy Physics, 2019 We calculate the double charmonium production cross-section within the framework of 4×4 Bethe-Salpeter Equation in the electron-positron annihilation, at center of mass energy s=10.6GeV, that proceeds through the exchange of a single virtual photon.
Hluf Negash, Shashank Bhatnagar
doaj +1 more source
Nuclear Physics B, 2014 The process of electron–positron annihilation into proton–antiproton pair is considered within the vicinity of ψ(3770) resonance. The interference between the pure electromagnetic intermediate state and the ψ(3770) state is evaluated.
A.I. Ahmadov +3 more
doaj +1 more source
Dark matter “transporting” mechanism explaining positron excesses
Journal of High Energy Physics, 2018 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
doaj +1 more source