Coincident measurement of the energy spectra of Doppler-shifted annihilation gamma quanta and positron-induced secondary electrons

Gladen, R. W.; Chirayath, V. A.; Fairchild, A. J.; Byrnes, N.; Köymen, A. R.; Weiss, A. H.

doi:10.1063/1.5135838

International Conference on Science and Applied Science (Icsas) 2019 2019

DOI: 10.1063/1.5135838

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Coincident measurement of the energy spectra of Doppler-shifted annihilation gamma quanta and positron-induced secondary electrons

R. W. Gladen

V. A. Chirayath

A. J. Fairchild

et al.

Abstract: Preliminary results are presented from a new positron beam system currently under development at the University of Texas at Arlington for the coincident energy measurement of Doppler-shifted annihilation quanta and positron-induced Auger electrons. We report data based on an analysis of the pulses resulting from the detection of positron induced secondary electrons by a micro-channel plate detector in coincidence with the pulses resulting from the detection of associated annihilation gamma rays in a NaI(Tl) ga… Show more

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2020

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A multi-stop time-of-flight spectrometer for the measurement of positron annihilation-induced electrons in coincidence with the Doppler-shifted annihilation gamma photon

Chirayath

Gladen

McDonald

et al. 2020

Review of Scientific Instruments

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Here we describe an advanced multi-functional, variable-energy positron beam system capable of measuring the energies of multiple 'positron-induced' electrons in coincidence with the Doppler-shifted gamma photon resulting from the annihilation of the correlated positron. The measurements were carried out using the unique characteristics of the digital time-of-flight spectrometer and the gamma spectrometer available with the advanced positron beam system. These measurements have resulted in (i) the first digital time-of-flight spectrum of positron annihilation-induced Auger electrons generated using coincident signals from a high-purity Ge detector and a micro-channel plate; (ii) a two-dimensional array of the energy of Dopplerbroadened annihilation gamma and the time-of-flight of positron-annihilation induced Auger electrons/secondary electrons measured in coincidence with the annihilation gamma photon; and (iii) the time-of-flight spectra of multiple secondary electrons ejected from a bilayer graphene surface as a result of the impact and/or annihilation of positrons. The novelty of the gammaelectron coincidence spectroscopy has been demonstrated by extracting the Doppler-broadened spectrum of gamma photons emitted due to the annihilation of positrons exclusively with 1s electrons of carbon. The width of the extracted Doppler-broadened gamma spectrum has been found to be consistent with the expected broadening of the annihilation gamma spectrum due to the momentum of the 1s electrons in carbon.

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A multi-stop time-of-flight spectrometer for the measurement of positron annihilation-induced electrons in coincidence with the Doppler-shifted annihilation gamma photon

Chirayath

Gladen

McDonald

et al. 2020

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

show abstract

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Coincident measurement of the energy spectra of Doppler-shifted annihilation gamma quanta and positron-induced secondary electrons

Cited by 1 publication

References 12 publications

A multi-stop time-of-flight spectrometer for the measurement of positron annihilation-induced electrons in coincidence with the Doppler-shifted annihilation gamma photon

A multi-stop time-of-flight spectrometer for the measurement of positron annihilation-induced electrons in coincidence with the Doppler-shifted annihilation gamma photon

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