Gamma-ray spectra from low-energy positron annihilation processes in molecules

Xiaoguang Ma, Meishan Wang, Yinghao Zhu, Yang Liu, Chuanlu Yang, and Dehua Wang
Phys. Rev. A 94, 052709 – Published 29 November 2016

Abstract

The theoretical γ-ray spectra from positron-electron annihilation process in a wide variety of atoms and molecules are studied. The theoretical Doppler broadened γ-ray spectra for core, inner valence, and outer valence electrons of these molecules are studied systematically. The present results show that the experimental γ-ray spectra agree well with inner valence electrons, especially the lowest occupied valence orbital electrons rather than the outer valence electrons. These inner valence electrons show a strong correlation with the corresponding available experimental measurements. These findings are interesting because the outer valence electrons have been supposed to have larger probability annihilating with positrons rather than the inner valence electrons. The present work also suggests that the accurate positron wave functions must be involved to identify the dominance of the bound electrons clearly in positron-electron annihilation process.

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  • Received 2 August 2016

DOI:https://doi.org/10.1103/PhysRevA.94.052709

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Xiaoguang Ma*, Meishan Wang, Yinghao Zhu, Yang Liu, Chuanlu Yang, and Dehua Wang

  • School of Physics and Optoelectronic Engineering, Ludong University, Yantai, Shandong 264025, People's Republic of China

  • *hsiaoguangma@188.com

Comments & Replies

Comment on “Gamma-ray spectra from low-energy positron annihilation processes in molecules”

D. G. Green and G. F. Gribakin
Phys. Rev. A 95, 036701 (2017)

Reply to “Comment on ‘Gamma-ray spectra from low-energy positron annihilation processes in molecules’ ”

Xiaoguang Ma, Meishan Wang, Yinghao Zhu, and Chuanlu Yang
Phys. Rev. A 95, 036702 (2017)

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Vol. 94, Iss. 5 — November 2016

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