Positron annihilation in α-HgI2

Details Positron annihilation in α-HgI2 Positron annihilation in α-HgI2

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nimpa.283..167n&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 283, Issue 2, p. 167-171.

Physics

4

Scientific paper

The lifetime of the delocalized positrons in α-HgI2 crystals is found to be 320+/-4 ps. Some crystals grown from the vapor phase in an excess of iodine have native mercury vacancies. The lifetime of positrons localized in mercury vacancies is 360+/-5 ps. Some crystals grown in unstabilized solutions with respect to added iodine show shorter lifetime components of 180-200 ps attributed to positron annihilation inside mercury-rich and/or impurity-rich clusters. Other crystals show both shorter and longer lifetime components than the lifetime in the bulk, indicating the coexistence of mercury vacancies with clusters rich in mercury interstitials and/or impurities. The energy resolution of the γ-ray detectors is correlated to the positron-lifetime spectra of the crystals.

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