CTAMOP-Durham collaboration leads to a Phys. Rev. Lett.
Last updated May 30, 2017 by Andrew Brown
A paper by a former CTAMOP Phd student Dermot Green (now at the Joint Quantum Centre (JQC) Durham/Newcastle, Department of Chemistry, Durham University) and Gleb Gribakin has just been published in Physical Review Letters: D. G. Green and G. F. Gribakin, γ-Ray Spectra and Enhancement Factors for Positron Annihilation with Core Electrons, Phys. Rev. Lett. 114, 093201 (2015). The process of positron annihilation in atoms is strongly affected by the electron-positron correllations. The paper shows that these are described accurately by the many-body theory and the calculated annihilation γ-ray spectra for argon, krypton and xenon are in excellent agreement with experiment. The theory also establishes accurate values of the positron annihilation probability with core electrons, and shows that the correlation enhancement factors display a universal scaling with the electron orbital energy. These factors can be used to improve positron annihilation calculations in complex environments, e.g., in molecules or solids.
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