Direct positron annihilation and positronium formation

N. Yamanaka, Y. Kino, Y. Takano, H. Kudo, A. Ichimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Positrons in a gas annihilate directly during a collision with target matter, or indirectly via positronium (Ps) formation followed by its decay. The cross sections of direct annihilation and Ps formation for hydrogen atom targets are calculated with the time-dependent coupled channel method. The result of the Ps-formation cross section is in good agreement with previous results. The direct annihilation cross section is found to be enhanced in energies around 10 eV well above the Ps-formation threshold. This enhancement is shown to be due to temporal positron capture with electronic excitation in the atom.

Original languageEnglish
Title of host publicationPositron Annihilation
Subtitle of host publicationProceedings of the 13th International Conference on Positron Annihilation, ICPA-13
EditorsToshio Hyodo, Haruo Saito, Yoshinori Kobayashi, Yasuyuki Nagashima
PublisherTrans Tech Publications Ltd
Pages449-451
Number of pages3
ISBN (Print)9780878499366
DOIs
Publication statusPublished - 2004
EventPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13 - Kyoto, Japan
Duration: 2003 Sep 72003 Sep 12

Publication series

NameMaterials Science Forum
Volume445-446
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

OtherPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13
CountryJapan
CityKyoto
Period03/9/703/9/12

Keywords

  • Direct Positron Annihilation
  • Positronium Formation
  • Temporal Positron Capture
  • Time-Dependent Coupled Channel Method
  • Wave Packet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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