About: Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1088/1367-2630/14/3/035005
Description	This work reports on precise measurements of two-quantum positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer. Annihilation-in-flight was measured for positrons emitted by Ge-68/Ga-68 and Na-22 radioisotopes and for various targets. Experimental data were compared with theoretical prediction by quantum electrodynamics. It was found that two-quantum positron annihilation-in-flight can be clearly recognized in two-dimensional coincidence Doppler broadening spectra as a hyperbolic curve with shape described well by the relativistic theory. The contribution of annihilation-in-flight is determined predominantly by the energy of incident positrons and is only weakly dependent on the target material. The profile of the positron annihilation-in-flight contribution for positron kinetic energies above 100 keV is well described by theory. This work reports on precise measurements of two-quantum positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer. Annihilation-in-flight was measured for positrons emitted by Ge-68/Ga-68 and Na-22 radioisotopes and for various targets. Experimental data were compared with theoretical prediction by quantum electrodynamics. It was found that two-quantum positron annihilation-in-flight can be clearly recognized in two-dimensional coincidence Doppler broadening spectra as a hyperbolic curve with shape described well by the relativistic theory. The contribution of annihilation-in-flight is determined predominantly by the energy of incident positrons and is only weakly dependent on the target material. The profile of the positron annihilation-in-flight contribution for positron kinetic energies above 100 keV is well described by theory. (en)
Title	Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer (en)
skos:prefLabel	Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer (en)
skos:notation	RIV/00216208:11320/12:10127760!RIV13-GA0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GAP108/11/1539), S
http://linked.open...iv/cisloPeriodika	2 March 2012
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Vlček, Marián Procházka, Ivan Čížek, Jakub
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	142918
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/12:10127760
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	lep; momentum; electrons; radiation (en)
http://linked.open.../riv/klicoveSlovo	electrons lep radiation momentum
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[CC2A94D37124]
http://linked.open...i/riv/nazevZdroje	New Journal of Physics
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Nanocrystalline materials - X-ray characterization of structure and its thermal stability
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	14
http://linked.open...iv/tvurceVysledku	Procházka, Ivan Vlček, Marián Čížek, Jakub
http://linked.open...ain/vavai/riv/wos	000302326600003
issn	1367-2630
number of pages	18 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/1367-2630/14/3/035005
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer

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