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Investigation of the abnormally-high annihilation rate of ortho-positronium in iodomethane gas

Research Project

Project/Area Number 23740310
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Atomic/Molecular/Quantum electronics
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

WADA Ken  大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 特別助教 (10401209)

Project Period (FY) 2011 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords原子 / 分子 / 陽電子消滅 / ポジトロニウム / 多孔性材料 / 機能性分離膜 / 原子・分子
Research Abstract

Although the mechanism of the abnormally high annihilation rate of ortho-positronium in iodomethane gas has not been revealed, a fundamental proportional relationship between the pick-off quenching cross-section and the geometrical cross section derived from the viscosity has been found for all the gaseous atoms and molecules previously reported through the study. Based on this result, a practical theory, which relates the positronium lifetime to the average size of free spaces in which positronium trapped, has been proposed.

Report

(3 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Research-status Report
  • Research Products

    (17 results)

All 2013 2012 2011 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (12 results) (of which Invited: 1 results) Remarks (1 results)

  • [Journal Article] A simple shape-free model for pore-size estimation with positron annihilation lifetime spectroscopy2013

    • Author(s)
      K. Wada and T. Hyodo
    • Journal Title

      J. Phys.: Conf. Ser

      Volume: 443 Pages: 12004-12004

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] A simple shape-free model for pore-size estimation with positron annihilation lifetime spectroscopy2013

    • Author(s)
      K. Wada
    • Journal Title

      J. Phys.: Conf. Ser.

      Volume: 未定

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pick-off quenching probability of ortho-positronium per collision with atoms and molecules2012

    • Author(s)
      K. Wada, F. Saito, N. Shinohara, and T. Hyodo
    • Journal Title

      Eur. Phys. J. D

      Volume: 66 Pages: 108-108

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Pick-off quenching probability of ortho-positronium per collision with atoms and molecules2012

    • Author(s)
      K. Wada
    • Journal Title

      Eur. Phys. J. D

      Volume: 66 Issue: 4

    • DOI

      10.1140/epjd/e2012-20668-5

    • Related Report
      2012 Annual Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Presentation] A classical-picture-based model for pore-size estimation with PALS analysis2012

    • Author(s)
      K. Wada and T. Hyodo
    • Organizer
      First China-Japan Joint Workshop on Positron Science (JWPS 2012)
    • Place of Presentation
      武漢大学(中国)
    • Related Report
      2012 Final Research Report
  • [Presentation] A simple model for the PALS evaluation of pore size in porous materials2012

    • Author(s)
      K. Wada and T. Hyodo
    • Organizer
      16th International Conference on Positron Annihilation (ICPA-16)
    • Place of Presentation
      Bristol大学(イギリス)
    • Related Report
      2012 Final Research Report
  • [Presentation] ポジトロニウムの寿命測定による空孔サイズ評価の新しいモデル2012

    • Author(s)
      和田健, 兵頭俊夫
    • Organizer
      第49回アイソトープ・放射線研究発表会
    • Place of Presentation
      東京大学農学部弥生講堂
    • Related Report
      2012 Annual Research Report 2012 Final Research Report
  • [Presentation] Application of positronium annihilation lifetime spectroscopy for the evaluation of the seize of the free space in porous materials2012

    • Author(s)
      K. Wada and T. Hyodo
    • Organizer
      International Workshop on Positrons in Astrophysics
    • Place of Presentation
      ミューレン(スイス)
    • Related Report
      2012 Final Research Report
  • [Presentation] Correlation of pick-off annihilation cross section and the collisional cross section for Ps-atom/molecule collisions2012

    • Author(s)
      K. Wada and T. Hyodo
    • Organizer
      International Workshop on Positrons in Astrophysics
    • Place of Presentation
      ミューレン(スイス)
    • Related Report
      2012 Final Research Report
  • [Presentation] 古典的モデルによるポジトロニウム細孔サイズ評価の基礎付け2012

    • Author(s)
      和田健, 兵頭俊夫
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西学院大学
    • Related Report
      2012 Final Research Report
  • [Presentation] A classical-picture-based model for pore-size estimation with PALS analysis2012

    • Author(s)
      K. Wada
    • Organizer
      First ChinaーJapan Joint Workshop on Positron Science (JWPS 2012)
    • Place of Presentation
      Wuhan University, Wuhan, China
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] A simple model for the PALS evaluation of pore size in porous materials2012

    • Author(s)
      K. Wada
    • Organizer
      16th International Conference on Positron Annihilation (ICPA-16)
    • Place of Presentation
      University of Bristol, Bristol, United Kingdom
    • Related Report
      2012 Annual Research Report
  • [Presentation] Correlation of pick-off annihilation cross section and the collisional cross section for Ps-atom/molecule collisions2012

    • Author(s)
      K. Wada and T. Hyodo
    • Organizer
      International Workshop on Positrons in Astrophysic
    • Place of Presentation
      Hotel Alpin Palace in Murren, Switzerland
    • Related Report
      2011 Research-status Report
  • [Presentation] ポジトロニウムを用いた古典的モデルによる細孔評価2011

    • Author(s)
      和田健, 兵頭俊夫
    • Organizer
      京都大学原子炉実験所専門研究会「陽電子科学とその理工学への応用」
    • Place of Presentation
      京都大学原子炉実験所
    • Related Report
      2012 Final Research Report
  • [Presentation] Pick-off quenching probability of ortho-positronium per collision on atoms and molecules2011

    • Author(s)
      K. Wada, F. Saito, and T. Hyodo
    • Organizer
      XVI International Workshop on Low-Energy Positron and Positronium Physics & XVII International Symposium on Electron-Molecule Collisions and Swarm (POSMOL 2011)
    • Place of Presentation
      メイヌース大学 (アイルランド)
    • Related Report
      2012 Final Research Report
  • [Presentation] Pick-off quenching probability of ortho-positronium per collision on atoms and molecules2011

    • Author(s)
      K. Wada, F. Saito, and T. Hyodo
    • Organizer
      XVI International Workshop on Low-Energy Positron and Positronium Physics
    • Place of Presentation
      National University of Ireland, Maynooth
    • Related Report
      2011 Research-status Report
  • [Remarks]

    • URL

      http://pfwww.kek.jp/slowpos/

    • Related Report
      2012 Final Research Report

URL: 

Published: 2011-08-05   Modified: 2019-07-29  

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