Results 91 to 100 of about 55,721 (192)

Improved generalized gradient approximation for positron states in solids

, 2014
Several first-principles calculations of positron-annihilation characteristics in solids have added gradient corrections to the local-density approximation within the theory by Arponen and Pajanne [Ann. Phys.
Barbiellini, Bernardo, Kuriplach, Jan
core   +1 more source

Positron annihilation spectroscopy on a beam of positrons the LEPTA facility

EPJ Web of Conferences, 2017
The results and possibilities of the samples surfaces research by the Doppler method of positron annihilation spectroscopy (PAS) for a monochromatic beam of positrons at the LEPTA facility are presented in this paper.
Ahmanova E.V., Eseev M.K., Kobets A.G., Meshkov I.N., Orlov O.S., Sidorin A.A., Siemek K., Horodek P.   +7 more
doaj   +1 more source

Review of physics program at J-PET [PDF]

EPJ Web of Conferences
The Jagiellonian - Positron Emission Tomograph (J-PET) is a multi purpose detector for tests of discrete symmetries and quantum entanglement of photons originating from the decay of positronium atoms.
Czerwiński Eryk
doaj   +1 more source

Positron annihilation spectroscopy in materials structure studies [PDF]

, 2002
В. И. Графутин, Evgenii P. Prokop'ev   +1 more
openalex   +1 more source

Subsurface zone detected in pure nickel by positron annihilation; Hall-Patch effect notification

, 2023
Jerzy Dryzek
openalex   +2 more sources

Low-energy supernova constraints on millicharged particles

Journal of High Energy Physics
The hot and dense conditions of the supernova core provide an ideal environment for the production of new feebly-interacting particles. Low-energy supernovae, characterized by low explosion energy, are particularly intriguing due to their stringent ...
Changqian Li, Zuowei Liu, Wenxi Lu, Zicheng Ye   +3 more
doaj   +1 more source

Atomic ionization at positron annihilation at β+-decay with taking into account screening [PDF]

Ядерна фізика та енергетика, 2012
The role of the nuclear charge screening and correctness of Born approximation for electron which is leaving atom in the process of atomic ionization at annihilation of positron with another electron of daughter's atom at β+-decay is studied. Processes
S. N. Fedotkin
doaj  

Positron Annihilation Spectroscopy of Young Supernova Remnants

Odessa Astronomical Publications, 2018
This paper discusses radiative and thermodynamic properties of cold rarefied aggregates of non-uniformly distributed gas and dust through which high fluxes of positrons with energies of 0.011-3.6 MeV pass.
D. N. Doikov
doaj   +1 more source

Unveiling atomic electron motion effects in e + e − high energy collisions at NA64

Journal of High Energy Physics
Atomic electron motion is responsible for well-studied effects observed in low-energy (MeV-scale) processes. Recently, interest in this phenomenon has also emerged within the high-energy physics community, due to its potential to increase significantly ...
Fernando Arias-Aragón, Giovanni Grilli di Cortona, Enrico Nardi   +2 more
doaj   +1 more source

Nuclear excitation at the positron annihilation taking into account the radiative corrections [PDF]

Ядерна фізика та енергетика, 2006
The process of nuclear excitation at the positron-atomic electron annihilation was considered. The relative contribution nonradiative versus radiative was analysed.
S. N. Fedotkin, V. A. Zheltonozhskii
doaj