Time-Dependent Coupled-Channel Calculations of the Annihilation Rate in Positron-Hydrogen Collisions

Nobuhiro Yamanaka, Yasushi Kino

Research output: Contribution to journalArticle


We calculate the positron annihilation rate in positron-hydrogen collisions for positron energies of 250 meV-6.5 eV using a time-dependent coupled channel method. A semiempirical model recently proposed in Phys. Rev. Lett. 79 (1997), 2241 predicts that the annihilation rate prominently enhances through virtual positronium formation as the positron energy approaches the positronium formation threshold (6.8 eV) from 4 eV. We illustrate time evolution of wave functions to show that such a prominent enhancement of the annihilation rate is not found and contribution of virtual positronium formation is not important below 6.5 eV.

Original languageEnglish
Pages (from-to)337-341
Number of pages5
JournalHyperfine Interactions
Issue number1-4
Publication statusPublished - 2003 Dec 1


  • Positron annihilation
  • Time-dependent coupled channel method

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Nuclear and High Energy Physics

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