RuPAC2016 - List of Authors (Ahmanova, E.V.)

Paper	Title	Page
WEPSB059	Realization of Positron Annihilation Spectroscopy at LEPTA Facility	496
	K. Siemek, V.I. Hilinov, P. Horodek JINR/DLNP, Dubna, Moscow region, Russia E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia A.G. Kobets IERT, Kharkov, Ukraine
	Positrons are used in materials science to study open volume defects. Several positron annihilation spectroscopy (PAS) techniques exist. These methods are based on detection of the 511 keV gamma quantum. The first method is the analysis of the Doppler broadening of annihilation line and provide information about defect concentration. Both annihilation quanta can be observed. Coincidence observation of two quanta gives additional information about the environment around defect. The second method is based on lifetime concept, which allows to distinguish type of defects. Nowadays, positron beams are of great interest for materials science. Using a low energy, monoenergetic beam it is possible to control the positron penetration depth from the sample surface to a depth of several microns. Thus, the beam can be used to characterize thin films, analysis of surface modification, studying influence of ions on matter etc. This report aims to present a current status of realization and progress in PAS methods at LEPTA facility at JINR.
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WEPSB060	Development of Positron Annihilation Spectroscopy at the LEPTA Facility	499
	A.A. Sidorin, E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia V.I. Hilinov, P. Horodek, I.N. Meshkov, K. Siemek JINR/DLNP, Dubna, Moscow region, Russia P. Horodek, K. Siemek IFJ-PAN, Kraków, Poland A.G. Kobets IERT, Kharkov, Ukraine
	The report aims to present the status of the development of the LEPTA facility for further enhancement of the positron annihilation spectroscopy (PAS) method application at the LEPTA facility. The research in solid state physics performed currently is based on slow monochromatic positron flux from the injector and Doppler PAS. The new positron transfer channel being under construction at the LEPTA allows us to develop more advanced PAS method - so called 'Positron Annihilation life-time spectroscopy' (PALS). It will enrich significantly the research program at the LEPTA. PAS method is sensitive to microdefects in solids. A pair of gamma quanta, born as a result of positron-electron annihilation carries information about the density of the defects that have the size less than 10 nm and are located at the depth from the surface of the material depending on the positron energy. New monochromatic positron source construction supplied with the autonomous cooling system with emitter-source of the activity of 30 mCi (iThemba LABS production) and new positron transfer channel are presented in report.
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Paper

Title

Page

Realization of Positron Annihilation Spectroscopy at LEPTA Facility

496

K. Siemek, V.I. Hilinov, P. Horodek
JINR/DLNP, Dubna, Moscow region, Russia
E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia
A.G. Kobets
IERT, Kharkov, Ukraine

Positrons are used in materials science to study open volume defects. Several positron annihilation spectroscopy (PAS) techniques exist. These methods are based on detection of the 511 keV gamma quantum. The first method is the analysis of the Doppler broadening of annihilation line and provide information about defect concentration. Both annihilation quanta can be observed. Coincidence observation of two quanta gives additional information about the environment around defect. The second method is based on lifetime concept, which allows to distinguish type of defects. Nowadays, positron beams are of great interest for materials science. Using a low energy, monoenergetic beam it is possible to control the positron penetration depth from the sample surface to a depth of several microns. Thus, the beam can be used to characterize thin films, analysis of surface modification, studying influence of ions on matter etc. This report aims to present a current status of realization and progress in PAS methods at LEPTA facility at JINR.

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPSB060

Development of Positron Annihilation Spectroscopy at the LEPTA Facility

499

A.A. Sidorin, E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia
V.I. Hilinov, P. Horodek, I.N. Meshkov, K. Siemek
JINR/DLNP, Dubna, Moscow region, Russia
P. Horodek, K. Siemek
IFJ-PAN, Kraków, Poland
A.G. Kobets
IERT, Kharkov, Ukraine

The report aims to present the status of the development of the LEPTA facility for further enhancement of the positron annihilation spectroscopy (PAS) method application at the LEPTA facility. The research in solid state physics performed currently is based on slow monochromatic positron flux from the injector and Doppler PAS. The new positron transfer channel being under construction at the LEPTA allows us to develop more advanced PAS method - so called 'Positron Annihilation life-time spectroscopy' (PALS). It will enrich significantly the research program at the LEPTA. PAS method is sensitive to microdefects in solids. A pair of gamma quanta, born as a result of positron-electron annihilation carries information about the density of the defects that have the size less than 10 nm and are located at the depth from the surface of the material depending on the positron energy. New monochromatic positron source construction supplied with the autonomous cooling system with emitter-source of the activity of 30 mCi (iThemba LABS production) and new positron transfer channel are presented in report.

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)