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Investigation of unexpectedly high-energy electron emission from water vapor by the impact of carbon ions with Bragg-peak energies and track analysis

Research Project

Project/Area Number 21540408
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Atomic/Molecular/Quantum electronics
Research InstitutionKyoto University

Principal Investigator

OHSAWA Daisuke  京都大学, 放射性同位元素総合センター, 助教 (90324681)

Co-Investigator(Kenkyū-buntansha) TOSAKI Mitsuo  京都大学, 放射性同位元素総合センター, 准教授 (70207570)
Project Period (FY) 2009 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords原子 / 分子 / 原子・分子物理 / 二次電子放出 / Fermi-Shuttle加速 / マイクロドジメトリ / トラック構造解析
Research Abstract

Further improving our previous apparatus, we have successfully measured absolute double differential cross section(DDCS) for secondary electron emission from water vapor by the impact of carbon ions with Bragg-peak energies. The angular distributions of DDCSs disagreed with the CDW-EIS theoretical calculation at the backward angles(> 100°), while single differential cross section(SDCS) agreed well with the CDW-EIS, particularly in the low-energy region(<200 eV), suggesting the contribution of Fermi-Shuttle acceleration to the ion-atom collisions is rather small for heavy-ion impact with incident energies of several MeV/u or higher. Comparisons of radial dose distributions for the carbon ions, deduced form Monte-carlo track simulation, with the Chatterjee model showed meaningful and significant discrepancies in the core region, implying the necessity of corrections of the model.

Report

(4 results)
  • 2011 Annual Research Report   Final Research Report ( PDF )
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (20 results)

All 2012 2011 2010 2009 Other

All Journal Article (9 results) (of which Peer Reviewed: 3 results) Presentation (7 results) Remarks (4 results)

  • [Journal Article] 重粒子線の生物効果初期過程における基礎物理研究2010

    • Author(s)
      大澤大輔, 等
    • Journal Title

      平成22年度放医研サイクロトロン利用報告書

      Volume: 1巻

    • Related Report
      2010 Annual Research Report
  • [Journal Article] Theoretical and experimental investigations of electron emission in C^<6+>+ H_2O collisions2009

    • Author(s)
      Dal Cappello, C. Champion, O. Boudrioua, H. Lekadir, Y. Sato and D. Ohsawa
    • Journal Title

      Nucl. In strum. Methods Phys. Res. B

      Volume: 267 Pages: 781-790

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Secondary electron emission from water vapor by carbon ion(6. 0 MeV/u C6+) impact and track-structure analysis in liquid water2009

    • Author(s)
      T. Okada, D. Ohsawa, H. Tawara, F. Soga, T. Murakami, Y. Honma, K. Noda
    • Journal Title

      Proc. of the 11th Symposium on Accelerator and Related Technology for Application ARTA 2009

      Pages: 41-44

    • Related Report
      2011 Final Research Report
  • [Journal Article] Secondary electron emission from water vapor by carbon ion(6.0MeV/u C^<6+>)impact and track structure analysis in water2009

    • Author(s)
      T.Okada, D.Ohsawa, et al.
    • Journal Title

      Proceedings of the 11th Accelerator and Related Technology for Application ARTA 2009 1巻

      Pages: 41-44

    • Related Report
      2009 Annual Research Report
  • [Journal Article] 炭素線衝撃による水蒸気からの二次電子放出とトラック構造解析2009

    • Author(s)
      岡田豊史
    • Journal Title

      千葉大学院 理学研究科 基礎理学専攻 物理学コース修士論文 1巻

      Pages: 1-87

    • Related Report
      2009 Annual Research Report
  • [Journal Article] 重粒子線の生物効果初期過程における基礎物理研究2009

    • Author(s)
      大澤大輔, 等
    • Journal Title

      平成21年度放医研サイクロトロン利用報告書 1巻

    • Related Report
      2009 Annual Research Report
  • [Journal Article] Secondary electron emission from water vapor under 6. 0-MeV/u C6+ ion impact

    • Author(s)
      D. Ohsawa, H. Tawara, T. Okada, F. Soga, M. E. Galassi, and R. D. Rivarola
    • Journal Title

      J. Phys.: Conf. Ser.

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] 炭素線衝撃による水蒸気からの二次電子放出とトラック構造解析

    • Author(s)
      岡田豊史
    • Journal Title

      平成21年度修士論文

    • Related Report
      2011 Final Research Report
  • [Journal Article] Secondary electron emission from water vapor under 6.0-MeV/u C^<6+> ion impact

    • Author(s)
      D.Ohsawa, et al
    • Journal Title

      J.Phys. : Conf.Ser.

      Volume: (in press)

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] ブラッグピーク領域の炭素線衝撃による水蒸気からの二次電子放出とトラック構造解析2012

    • Author(s)
      大澤大輔
    • Organizer
      理学会第67回年次大会領域1シンポジウム放射線が生体に与える影響-原子分子から生物
    • Place of Presentation
      関西学院大学西宮西宮上ケ原キャンパス
    • Year and Date
      2012-03-24
    • Related Report
      2011 Annual Research Report
  • [Presentation] ブラッグピーク領域の炭素線衝撃による水蒸気からの二次電子放出とトラック構造解析-シンポジウム放射線が生体に与える影響-原子分子から生物まで?2012

    • Author(s)
      大澤大輔
    • Organizer
      日本物理学会第67回年次大会領域
    • Place of Presentation
      関西学院大学西宮西宮上ケ原キャンパス
    • Related Report
      2011 Final Research Report
  • [Presentation] Secondary electron emission from water vapor under 6. 0-MeV/u C6+ ion impact2011

    • Author(s)
      D. Ohsawa, H. Tawara, T. Okada, F. Soga, M. E. Galassi, and R. D. Rivarola
    • Organizer
      XXVII International Conference on Photonic, Electronic and Atomic Collisions
    • Place of Presentation
      Belfast, Northern Ireland, UK
    • Related Report
      2011 Final Research Report
  • [Presentation] ブラッグピーク領域の炭素線衝撃による水蒸気からの二次電子放出とトラック構造解析2011

    • Author(s)
      大澤大輔, 俵博之, 上原周三, 曽我文宣
    • Organizer
      日本原子力学会2011年秋の大会
    • Place of Presentation
      北九州国際会議場
    • Related Report
      2011 Annual Research Report 2011 Final Research Report
  • [Presentation] condary electron emission from water vapor under 6.0-MeV/u C^<6+> ion impa2011

    • Author(s)
      D.Ohsawa, et al
    • Organizer
      VII International Conference on Photonic, Electronic and Atomic Collisio
    • Place of Presentation
      Beifast, Northern Ireland, UK
    • Related Report
      2011 Annual Research Report
  • [Presentation] Secondary electron emission from water vapor by carbon ion(6. 0 MeV/u C6+) impact and track-structure analysis in liquid water2009

    • Author(s)
      T. Okada, D. Ohsawa, H. Tawara, F. Soga, T. Murakami, Y. Honma, K. Noda
    • Organizer
      11th Symposium on Accelerator and Related Technology for Application
    • Place of Presentation
      東京工業大学百年記念館
    • Year and Date
      2009-06-12
    • Related Report
      2011 Final Research Report
  • [Presentation] 炭素線衝撃による水蒸気からの二次電子放出とトラック構造解析2009

    • Author(s)
      岡田豊史, 大澤大輔, 等
    • Organizer
      第11回応用加速器関連技術シンポジウムARTA2009
    • Place of Presentation
      東京工業大学百年記念館(東京都)
    • Year and Date
      2009-06-12
    • Related Report
      2009 Annual Research Report
  • [Remarks]

    • URL

      http://kyouindb.iimc.kyoto-u.ac.jp/j/vQ8hO

    • Related Report
      2011 Final Research Report
  • [Remarks]

    • URL

      http://kyouindb.iimc.kyoto-u.ac.jp/j/vQ8hO

    • Related Report
      2011 Annual Research Report
  • [Remarks]

    • URL

      http://web.nirs.go.jp/

    • Related Report
      2010 Annual Research Report
  • [Remarks]

    • URL

      http://web.nirs.go.jp/

    • Related Report
      2009 Annual Research Report

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Published: 2009-04-01   Modified: 2016-04-21  

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