Results 101 to 110 of about 41,858 (234)

Stable fourfold configurations for small vacancy clusters in silicon from ab initio calculations

, 2004
Using density-functional-theory calculations, we have identified new stable configurations for tri-, tetra-, and penta-vacancies in silicon. These new configurations consist of combinations of a ring-hexavacancy with three, two, or one interstitial atoms,
D. V. Makhov, Laurent J. Lewis, M. Huang, Motoko-Kwete, R. Krause-Rehberg, S. K. Estreicher, W. Fuhs, Y.-H. Lee, Y.-H. Lee   +8 more
core   +1 more source

Performance of three-photon PET imaging: Monte Carlo simulations

, 2005
We have recently introduced the idea of making use of three-photon positron annihilations in positron emission tomography. In this paper the basic characteristics of the three-gamma imaging in PET are studied by means of Monte Carlo simulations and ...
Charlton M, Kakimoto M, Krzysztof Kacperski, Machulla H J, Nicholas M Spyrou, Schepp L A, Stickel J R   +6 more
core   +1 more source

Beyond the Point Ps Approximation

, 2012
In application to positron annihilation spectroscopy, Ps atom is considered not as a point particle, but as a finite size e+ e- pair localized in a bubble-state in a medium. Variation of the internal Coulombic e+ -e- attraction vs.
Byakov, Vsevolod M., Stepanov, Sergey V., Zvezhinskiy, Dmitry S.   +2 more
core   +1 more source

Detection of deuterium trapping sites in tungsten by thermal desorption spectroscopy and positron annihilation spectroscopy

Nuclear Materials and Energy, 2016
Thermal desorption spectroscopy (TDS) of tungsten implanted with D2+ ions was performed after irradiation with 8 MeV-electrons, 5.0keV-D2+, and 6.0 MeV-Fe3+. The release peak temperatures of the TDS spectra are discussed.
K. Sato, R. Tamiya, Q. Xu, H. Tsuchida, T. Yoshiie   +4 more
doaj   +1 more source

Investigation of Nitrogen and Vacancy Defects in Synthetic Diamond Plates by Positron Annihilation Spectroscopy. [PDF]

Materials (Basel), 2022
Eseev M, Kuziv I, Kostin A, Meshkov I, Sidorin A, Orlov O.   +5 more
europepmc   +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

Positron annihilation spectroscopy of defects in nuclear and irradiated materials- a review

, 2021
F. Selim
semanticscholar   +1 more source

Light induced phenomena in new polymeric thin films based on aminostyrene

Moldavian Journal of the Physical Sciences, 2006
The light-induced modification of mechanical and optical properties of several amino- styrene-containing polymers has been investigated. The nano- and microindentation techniques were used for determination of mechanical parameters.
Palistrant, Natalia
doaj  

Interpretations and implications of gamma ray lines from solar flares, the galactic center in gamma ray transients [PDF]

Observations and theories of astrophysical gamma ray line emission are reviewed and prospects for future observations by the spectroscopy experiments on the planned Gamma Ray Observatory are ...
Lingenfelter, R. E., Ramaty, R.
core   +1 more source

Photon correlations in positron annihilation

, 2010
The two-photon positron annihilation density matrix is found to separate into a diagonal center of energy factor implying maximally entangled momenta, and a relative factor describing decay.
Isabelle Gauthier, J. J. Sakurai, M. O. Scully, Margaret Hawton   +3 more
core   +1 more source