Positron Annihilation with Inner-Shell Electrons in Noble Gas Atoms

K. Iwata, G. F. Gribakin, R. G. Greaves, C. M. Surko

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Measurements are presented of the Doppler broadening of the 511-keV
γ-ray line from thermalized positrons annihilating with Ar, Kr, and Xe. The experiments are conducted at low pressures using positrons stored in a Penning-Malmberg trap, which ensures that only two-body interactions are involved. The contributions from annihilation on inner-shell electrons are studied quantitatively in an isolated atomic system for the first time. The spectra are compared with theoretical calculations using a simple Hartree-Fock model to identify the inner-shell contributions.
Original languageEnglish
Pages (from-to)39-42
JournalPhysical Review Letters
Publication statusPublished - 07 Jul 1997


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