Angular correlation of annihilation photons in ice single crystals

O. E. Mogensen, G. Kvajic, Morten Mostgaard Eldrup, M. Milosevic-Kvajic

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    Linear-slit angular-correlation curves were obtained at - 148 °C for the [0001], [10¯10], and [11¯20] directions in single crystals of ice. Besides the narrow central peak, pronounced narrow side peaks were also observed. They occurred at angles θ=2πℏgz/mc, where gz is the projection of reciprocal-lattice vectors g⃗ on the direction perpendicular to the slits and the sample surface. The relative area of the central plus the side peaks was (15.2 ± 0.4)% for all curves. All the peaks are interpreted as due to parapositronium annihilation. The side peaks are explained as evidence for the positronium center-of-mass wave function being a Bloch function, i.e., that positronium is delocalized in ice.
    Original languageEnglish
    JournalPhysical Review B
    Issue number1
    Pages (from-to)71-73
    Publication statusPublished - 1971

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