Positron annihilation in flight: experiment with slow and fast positrons

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10287951" target="_blank" >RIV/00216208:11320/14:10287951 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1742-6596/505/1/012043" target="_blank" >http://dx.doi.org/10.1088/1742-6596/505/1/012043</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/505/1/012043" target="_blank" >10.1088/1742-6596/505/1/012043</a>

Result language

angličtina

Original language name

Positron annihilation in flight: experiment with slow and fast positrons

Original language description

A novel digital coincidence Doppler broadening (D-CDB) spectrometer was employed for energy resolved investigations of two-quantum annihilation-in-flight (TQAF). The TQAF phenomenon was studied using monoenergetic positrons produced in a slow positron beam and also using fast positrons. Because of a low background the measurements on the slow positron beam could be performed in a close geometry and the TQAF contribution in the two-dimensional gamma ray energy spectra fills a 'bowl-like' area delimited by a hyperbolic curve and a kinematical cut-off determined by the kinetic energy of positrons. With decreasing positron energy the area of TQAF contribution becomes smaller and disappears completely for slow positrons with energies below similar to 100 eV. The measurements with fast positrons were restricted to a limited range of angles between the annihilation gamma rays and the TQAF events contribute to a hyperbolic band in gamma ray energy spectrum.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JD - Use of computers, robotics and its application

OECD FORD branch

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Project

<a href="/en/project/GA13-09436S" target="_blank" >GA13-09436S: Non-destructive mapping of spatial distribution of defects in highly strained materials</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2014

Confidentiality

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

Article name in the collection

Journal of Physics: Conference Series

ISBN

—

ISSN

1742-6588

e-ISSN

—

Number of pages

4

Pages from-to

1-4

Publisher name

IOP PUBLISHING LTD

Place of publication

BRISTOL

Event location

Munich

Event date

Sep 15, 2013

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000338216500043