Results 81 to 90 of about 245,057 (208)

A simple shape-free model for pore-size estimation with positron annihilation lifetime spectroscopy

, 2013
Positron annihilation lifetime spectroscopy is one of the methods for estimating pore size in insulating materials. We present a shape-free model to be used conveniently for such analysis.
K. Wada, T. Hyodo
semanticscholar   +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

Electron-positron pair production and annihilation spectral features from compact sources [PDF]

, 1995
A. Niedźwiecki, A. A. Zdziarski, P. Coppi   +2 more
openalex   +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

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

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

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  

Monovacancies and Na substitutional defects in PbTe: theoretical positron annihilation study [PDF]

, 2013
Junhua Liu, Binhai Cheng, L J Zhang, J Zhang, Huihui Weng, B J Ye   +5 more
openalex   +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  

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