6533b85efe1ef96bd12c059a

RESEARCH PRODUCT

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

Andrzej BaranowskiM. KostrzewaJ BeliczynskiM. Szuszkiewicz

subject

PhysicsNuclear and High Energy PhysicsAnnihilationSpectrometerResolution (electron density)chemistry.chemical_elementElectronic structureSpectral lineNuclear physicssymbols.namesakeFull width at half maximumNickelchemistrysymbolsAtomic physicsInstrumentationDoppler effect

description

Abstract 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.

yearjournalcountryeditionlanguage
2004-07-01Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
https://doi.org/10.1016/j.nima.2004.02.031