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The study of the alpha condensed state in the 4 alpha cluster nucleus

Research Project

Project/Area Number 19740119
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionTohoku University

Principal Investigator

ITOH Masatoshi  Tohoku University, サイクロトロン・ラジオアイソトープセンター, 助教 (30400435)

Project Period (FY) 2007 – 2009
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywords核物理 / α凝縮状態 / 酸素原子核 / αクラスター
Research Abstract

フェルミ多体系である原子核においても、α粒子クラスターを形成することによって、ボーズ・アインシュタイン凝縮状態に類似した状態が存在するかどうかを実験的に証明するために、東北大学サイクロトロン・ラジオアイソトープセンターにおいて高分解能ビームラインの整備から同時計測による崩壊粒子測定装置の開発、さらにVMEを用いたデータ収集系の構築を行った。本実験においては4α粒子クラスター原子核である^<16>O原子核の励起エネルギー15.097MeVの0^+状態からの崩壊α粒子測定を行ったが、^<12>Cのα凝縮状態への崩壊分岐比は小さいことがわかった。今後、理論計算との比較が必要となる。しかしながら、本研究で開発した高分解能ビームラインおよび崩壊粒子測定装置を用いることで広範囲の励起エネルギー領域に渡ってα凝縮状態の探索が可能になった。

Report

(3 results)
  • 2009 Final Research Report ( PDF )
  • 2008 Annual Research Report
  • 2007 Annual Research Report
  • Research Products

    (22 results)

All 2009 2008 2007 Other

All Journal Article (11 results) (of which Peer Reviewed: 11 results) Presentation (10 results) Remarks (1 results)

  • [Journal Article] Direct proton decay of the isoscaler giant dipole resonance in 208Pb2009

    • Author(s)
      B.K. Nayak, et al (23名中13番目)
    • Journal Title

      Physics Letters B 674

      Pages: 281-285

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Wolfenstein parameters for s1/2 proton knockout (p, 2p) reaction2008

    • Author(s)
      T. Noro, et al(22名中7番目)
    • Journal Title

      Physical Review C 77

      Pages: 44604-44604

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Proton elastic scattering from tin isotopes at 295 MeV and systematic hange of neutron density distributions2008

    • Author(s)
      S. Terashima, et al (15名中5番目)
    • Journal Title

      Physical Review C 77

      Pages: 24317-24317

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] The second 2+ state at Ex~10 MeV in 12C2008

    • Author(s)
      M. Itoh, et al (20名中1番目)
    • Journal Title

      Nuclear Physics A 805

      Pages: 371-373

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Proton elastic scattering from tin isotopes at 295 MeV and systematic change of neutron density distributions2008

    • Author(s)
      S. Terashima et.al.
    • Journal Title

      Physical Review C 77

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Wolfenstein parameters for s1/2 proton knockout(p, 2p)reactions2008

    • Author(s)
      T. Noro et.al.
    • Journal Title

      Physical Review C 77

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct proton decay of the isoscalar giant dipole resonance in 208Pb2008

    • Author(s)
      B.K. Nayak et.al.
    • Journal Title

      Physics Letters B 674

      Pages: 281-285

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 2α+t cluster structure in 11B2007

    • Author(s)
      T. Kawabata, et al (19名中8番目)
    • Journal Title

      Physics Letters B 646

      Pages: 6-11

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] New candidate for an alpha cluster condensed state in 16O(α, α') at 400 MeV2007

    • Author(s)
      T. Wakasa, et al (20名中7番目)
    • Journal Title

      Physics Letters B 653

      Pages: 173-177

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] New candidate for an alpha cluster condensed state in ^<16>O (α,α') at 400 MeV2007

    • Author(s)
      T. Wakasa, et. al.
    • Journal Title

      Physics Letters B 653

      Pages: 173-177

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 2α+t cluster structure in ^<11>B2007

    • Author(s)
      T. Kawabata, et. al.
    • Journal Title

      Physics Letters B 646

      Pages: 6-11

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] 逆運動学による16Oのα凝縮状態の研究2009

    • Author(s)
      伊藤正俊、高橋利弥、長野哲也、杉本直也、吉田英智、酒見泰寛
    • Organizer
      日本物理学会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-28
    • Related Report
      2009 Final Research Report
  • [Presentation] 重運動学による^<16>Oのα凝縮状態の探索2009

    • Author(s)
      伊藤正俊
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-28
    • Related Report
      2008 Annual Research Report
  • [Presentation] Experimental studies of α-condensed states2008

    • Author(s)
      M. Itoh
    • Organizer
      KGU Yokohama Autumn School of Nuclear Physics
    • Place of Presentation
      関西学院大学関内メディアセンター
    • Year and Date
      2008-10-09
    • Related Report
      2009 Final Research Report
  • [Presentation] Experimental studies of α-condensed states2008

    • Author(s)
      伊藤正俊
    • Organizer
      KGU Yokohama Autumn School of Nuclear Physics
    • Place of Presentation
      関東学院大学段内メディァセンター
    • Year and Date
      2008-10-09
    • Related Report
      2008 Annual Research Report
  • [Presentation] 逆運動学によるα凝縮状態の研究2007

    • Author(s)
      伊藤正俊、大関和貴、酒見泰寛、松尾亮
    • Organizer
      日本物理学会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-21
    • Related Report
      2009 Final Research Report
  • [Presentation] 逆運動学による^<16>Oのα凝縮状態の研究2007

    • Author(s)
      伊藤 正俊
    • Organizer
      日本物理学会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] Study of cluster states in the Ex=10 MeV region in 12C.2007

    • Author(s)
      M. Itoh, H. Akimune, M. Fujiwara, H. Hashimoto, T. Kawabata, T. Murakami, K. Nakanishi, Y. Nakatsugawa, H. Sakaguchi, S. Terashima, M. Uchida, Y. Yasuda, M. Yosoi, J. Zenihiro
    • Organizer
      クラスター国際会議
    • Place of Presentation
      イギリス・ストラットフォードアポンエボン
    • Year and Date
      2007-09-03
    • Related Report
      2009 Final Research Report
  • [Presentation] Study of cluster states in the Ex=10MeV region in ^<12>C2007

    • Author(s)
      伊藤 正俊
    • Organizer
      クラスター国際会議
    • Place of Presentation
      イギリス・ストラットフォードアポンエボン
    • Year and Date
      2007-09-03
    • Related Report
      2007 Annual Research Report
  • [Presentation] The second 2+ state at Ex~10MeV in 12C.2007

    • Author(s)
      M. Itoh, H. Akimune, M. Fujiwara, U. Garg, H. Hashimoto, T. Kawabata, K. Kawase, S. Kishi, T. Murakami, K. Nakanishi, Y. Nakatsugawa, B.K. Nayak, S. Okumura, H. Sakaguchi, H. Takeda, S. Terashima, M. Uchida, Y. Yasuda, M. Yosoi, J. Zenihiro
    • Organizer
      原子核国際会議(INPC2007)
    • Place of Presentation
      東京国際フォーラム
    • Year and Date
      2007-06-06
    • Related Report
      2009 Final Research Report
  • [Presentation] The second 2^+ state at Ex~10MeV in ^<12>C2007

    • Author(s)
      伊藤 正俊
    • Organizer
      原子核国際会議
    • Place of Presentation
      東京国際フォーラム
    • Year and Date
      2007-06-06
    • Related Report
      2007 Annual Research Report
  • [Remarks]

    • URL

      http://cycgw1.cyric.tohoku.ac.jp/~itoh/a-cond/index.html

    • Related Report
      2009 Final Research Report

URL: 

Published: 2007-04-01   Modified: 2016-04-21  

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