Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer

Details Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer Investigation of positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012njph...14c5005c&link_type=abstract

New Journal of Physics, Volume 14, Issue 3, pp. 035005 (2012).

Physics

Scientific paper

This work reports on precise measurements of two-quantum positron annihilation-in-flight using a digital coincidence Doppler broadening spectrometer. Annihilation-in-flight was measured for positrons emitted by 68Ge/68Ga and 22Na radioisotopes and for various targets. Experimental data were compared with theoretical prediction by quantum electrodynamics. It was found that two-quantum positron annihilation-in-flight can be clearly recognized in two-dimensional coincidence Doppler broadening spectra as a hyperbolic curve with shape described well by the relativistic theory. The contribution of annihilation-in-flight is determined predominantly by the energy of incident positrons and is only weakly dependent on the target material. The profile of the positron annihilation-in-flight contribution for positron kinetic energies above 100 keV is well described by theory.

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