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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10127760" target="_blank" >RIV/00216208:11320/12:10127760 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1367-2630/14/3/035005" target="_blank" >http://dx.doi.org/10.1088/1367-2630/14/3/035005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1367-2630/14/3/035005" target="_blank" >10.1088/1367-2630/14/3/035005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 forvarious 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 asa 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 forvarious 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 asa 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GAP108%2F11%2F1539" target="_blank" >GAP108/11/1539: Nanokrystalické materiály - rtg charakterizace struktury a její teplotní stability</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

New Journal of Physics

ISSN

1367-2630

e-ISSN

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Svazek periodika

14

Číslo periodika v rámci svazku

2 March 2012

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

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Kód UT WoS článku

000302326600003

EID výsledku v databázi Scopus

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