Low Background Digital Coincidence Spectrometer – A Tool for Investigation of Positron Annihilation in Flight
Low Background Digital Coincidence Spectrometer – A Tool for Investigation of Positron Annihilation in Flight
Čížek, M. V.; Lukáč, F.; Melikhova, O.; Procházka, I.; Anwand, W.; Butterling, M.; Wagner, A.; Brauer, G.
Abstract
A digital spectrometer for low background gamma ray spectroscopy equipped with two high purity Ge detectors and a 12-bit two channel digitizer was employed for the investigation of positron annihilation-in-flight. Measurements were performed for positrons emitted by 68Ge/68Ga and 22Na radioisotopes and annihilated in Cu and Mg targets. The contribution of the two-quantum positron annihilation-in-flight was clearly resolved in coincidence two-dimensional gamma ray energy spectra. The contribution of positrons annihilated in flight has a hyperbolic shape described well by the relativistic theory.
Keywords: Digital Spectrometer; Doppler Shift; Positron Annihilation in Flight
Beteiligte Forschungsanlagen
- P-ELBE
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Buchkapitel
B.N. Ganguly, G. Brauer: Near Surface Depth Profiling by Mono-energetic Positrons, Switzerland: Trans Tech Publisher, 2012, 978-3-03785-524-9, 53-73
DOI: 10.4028/www.scientific.net/DDF.331.53
Cited 1 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-18232