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Pick-off quenching probability of ortho-positronium per collision with atoms and molecules

  • K. WadaEmail author
  • F. Saito
  • N. Shinohara
  • T. Hyodo
Regular Article
Part of the following topical collections:
  1. Topical issue: Electron/Positron Collision

Abstract

Positronium quenching through its collisions with gaseous atoms and molecules is discussed. It is found that the values of the normalized pick-off quenching parameter, 1Zeff, at room temperature are roughly proportional to the geometric collisional cross-sections estimated from the radius of the positronium and those of the atoms and molecules derived from the viscosity. This suggests that the probabilities of the pick-off quenching of the thermalized positronium per collision with various atoms and molecules are almost constant.

Keywords

Topical issue: Electron/Positron Collision. Guest editors: Michael Brunger, Anne Lafosse, Gaetana Laricchia, Paulo Limao-Vieira and Nigel Mason 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)IbarakiJapan
  2. 2.Institute of Physics, Graduate School of Arts and SciencesUniversity of TokyoTokyoJapan
  3. 3.Faculty of Health SciencesYamaguchi University School of MedicineYamaguchiJapan

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