A two-detector spectrometer for measurements of Doppler broadened positron annihilation spectra

Autor:	Andrzej Baranowski, M. Kostrzewa, J Beliczynski, M. Szuszkiewicz
Rok vydání:	2004
Předmět:	Physics Nuclear and High Energy Physics Annihilation Spectrometer Resolution (electron density) chemistry.chemical_element Electronic structure Spectral line Nuclear physics symbols.namesake Full width at half maximum Nickel chemistry symbols Atomic physics Instrumentation Doppler effect
Zdroj:	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 526:420-431
ISSN:	0168-9002
Popis:	A two-detector spectrometer for measurements of Doppler broadened positron annihilation spectra has been constructed and tested. The energy difference of the annihilation quanta is measured in the analogue, not in the digital manner. The peak to background ratio in the measured spectra is of the order of 10 6 , the FWHM representing the energy resolution, equals to 1.1 keV , thus enabling the very subtle physical effects to be revealed. Some information on electronic structure of the investigated 3-d metals (Ti, V, Cr, Fe, Ni, Cu and Zn) has been determined using this spectrometer. It has been shown that the apparatus permits to detect the impurity-vacancy pairs in dilute nickel alloys containing 1% of Zr admixture.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5dfbbbeafe0282d59679383644a31c22 https://doi.org/10.1016/j.nima.2004.02.031 Zobrazit plný text záznamu Full Text from ScienceDirect