• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of the mechanism on the super nova explosion by proton induced coherent pion production

Research Project

Project/Area Number 18340063
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionTohoku University (2007-2008)
Osaka University (2006)

Principal Investigator

SAKEMI Yasuhiro  Tohoku University, サイクロトロン・ラジオアイソトープセンター, 教授 (90251602)

Co-Investigator(Kenkyū-buntansha) 畑中 吉次  大阪大学, 核物理研究センター, 教授 (50144530)
民井 淳  大阪大学, 核物理研究センター, 准教授 (20302804)
作田 誠  岡山大学, 自然科学研究科, 教授 (40178596)
若狭 智嗣  九州大学, 理学研究科, 准教授 (10311771)
岡村 弘之  大阪大学, 核物理研究センター, 教授 (10221144)
Co-Investigator(Renkei-kenkyūsha) HATANAKA Kichiji  大阪大学, 核物理研究センター, 教授 (50144530)
TAMII Atsushi  大阪大学, 核物理研究センター, 准教授 (20302804)
SAKUDA Makoto  岡山大学, 自然科学研究科, 教授 (40178596)
WAKASA Tomotsugu  九州大学, 理学研究科, 准教授 (10311771)
Project Period (FY) 2006 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥15,840,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2008: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2007: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2006: ¥7,000,000 (Direct Cost: ¥7,000,000)
Keywords核力 / コヒーレントπ中間子 / デルタ粒子間相互作用 / △粒子 / コヒーレントπ中間子生成 / ランダウ・ミグダルパラメータ / π中間子凝縮 / ガス電子増幅検出器 / Δ粒子 / コヒーレントパイ中間子生成 / ランダウミグダルパラメータ / パイ中間子凝縮 / GEM
Research Abstract

超新星爆発後に形成される高密度核物質・中性子星の内部構造、特にπ中間子凝縮状態への相転移臨界密度に関して知見を得るために、中間エネルギー陽子ビームを用いたコヒーレントπ中間子生成(CPP)実験を行った。
終状態に生成されるπ中間子のエネルギーを高精度に測定するため、高位置分解能ガス電子増幅検出器(GEM)を新しく開発した。この新規開発したGEM検出器と大阪大学・核物理研究センターの高分解能中性子測定器(NPOL2)と組み合わせて、^(12)Cターゲットからの生成π中間子と荷電移行反応中性子を同時計測し、残留原子核である^(12)Cの励起状態を~7MeV程度の高エネルギー分解能で測定する技術を確立した。
平成19年に行った本実験から、終状態の^(12)Cが基底状態にとどまる「コヒーレント」過程(コヒーレントπ中間子生成)を識別し、その反応断面積から原子核媒質中におけるΔ粒子間相互作用の短距離成分強度を実験的に抽出することに成功した。その結果、Δ粒子間相互作用の短距離成分が斥力に働く傾向を見出した。実験的に抽出したΔ粒子間相互作用強度から、CPP実験の統計精度による不確定要素が大きいものの、理論研究の進展とともにπ中間子凝縮状態の臨界密度に関する情報を得つつある。

Report

(4 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • Research Products

    (27 results)

All 2009 2008 2007 2006 Other

All Journal Article (17 results) (of which Peer Reviewed: 14 results) Presentation (5 results) Remarks (5 results)

  • [Journal Article] Nuclear structure relevant to neutrinoless double beta decay : The valence protons in Ge-76 and Se-76.2009

    • Author(s)
      B. P. Kay, et.al. (22人中16番目)
    • Journal Title

      Phys. Rev. C 79

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Complete set of polarization transfer coefficients for the He-3 (p, n) reaction at 346 MeV and 0 degrees2008

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

      Phys. Rev. C 77 : 054611

      Pages: 6-6

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Study of energy dependence of pion production by proton on copper target near 350-MeV2008

    • Author(s)
      E. V. Karpechev, et.al.
    • Journal Title

      Phys. Atom. Nucl 71 : 1-8

      Pages: 8-8

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Gamow-Teller transitions in exotic pf-shell nuclei relevant to supernova explosion2008

    • Author(s)
      Y. Fujita, et.al.
    • Journal Title

      J. Phys. G 35 : 014041

      Pages: 6-6

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] High rate production of polarized He-3 with meta-stability exchange method2008

    • Author(s)
      Ema Ihara, Tomotsugu Wakasa, Masanori Dozono(Kyushu U.), Yasuhiro Sakemi(CYRIC, Tohoku U.)
    • Journal Title

      J.Phys.Soc.Jap. 77 : 025002

      Pages: 6-6

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Study of energy dependence of pion production by proton on copper target near 350-MeV2008

    • Author(s)
      E. V. Karpechev, et.al.(15人中8番目)
    • Journal Title

      Phys. Atom. Nucl. 71

      Pages: 1-8

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] (He-3,t) reaction on the double beta decay nucleus Ca-48 and the importance of nuclear matrix elements2007

    • Author(s)
      E.-W. Grewe, et.al.
    • Journal Title

      Phys. Rev. C 76 : 054307

      Pages: 8-8

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Study of nuclear correlation effects via C-12(vec-p, vec-n)N-12(g.s., 1+)at 296-MeV2007

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

      Phys. Lett. B 656 : 38-44

      Pages: 15-15

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Gamow-Teller Strength in the Exotic Odd-Odd Nuclei La-138 and Ta-180 and Its Relevance for Neutrino Nucleosynthesis2007

    • Author(s)
      A. Byelikov et.al.
    • Journal Title

      Phys. Rev. Lett. 98 : 082501

      Pages: 4-4

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Proton induced coherent pion production2007

    • Author(s)
      K. Fujita,Y. Sakemi et.al.
    • Journal Title

      AIP Conf. Proc(Also in *Kyoto 2006, Spin physics*) 915 : 803-806

      Pages: 803-806

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Proton induced coherent pion production.2007

    • Author(s)
      K. Fujita, Y. Sakemi, et. al.
    • Journal Title

      AIP Conf. Proc. 17th International Spin Physics Symposium(SPIN06), Kyoto, Japan, 915

      Pages: 803-806

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Study of nuclear correlation effects viaC-12(vec-p, vec-n)N-12(g.s., 1+)at 296-MeV2007

    • Author(s)
      T. Wakasa, et. al.(18人中13番目)
    • Journal Title

      Physics. Lett. B656

      Pages: 38-44

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 永久電気双極子モーメントの探索2007

    • Author(s)
      酒見 泰寛
    • Journal Title

      原子核研究 52

      Pages: 46-58

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Study of the pionic enhancement in O-16(p, p')O-16(0-, T=1)at 295 MeV2006

    • Author(s)
      A. Wakasa et.al.
    • Journal Title

      Phys. Lett. B632 : 485-489

      Pages: 5-5

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Study for the neutrino coherent pion production experiment2006

    • Author(s)
      Y. Sakemi
    • Journal Title

      Nucl. Phys. Proc. Suppl 155 : 266-268

      Pages: 3-3

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Study for the neutrino coherent pion production experiment2006

    • Author(s)
      Y.Sakemi
    • Journal Title

      Nucl.Phys.Proc. 155(Suppl.)

      Pages: 266-268

    • Related Report
      2006 Annual Research Report
  • [Journal Article] High-resolution study of Gamow-Teller transitions from the Tx=1 nucleus Ti46 to the Tz= nucleus V462006

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

      Phys.Rev.C 73

      Pages: 24311-24311

    • Related Report
      2006 Annual Research Report
  • [Presentation] フランシウムEDM探索実験計画の現状2008

    • Author(s)
      酒見泰寛
    • Organizer
      東北大学・CYRIC/GCOE研究会
    • Place of Presentation
      仙台・作並
    • Year and Date
      2008-08-19
    • Related Report
      2008 Annual Research Report
  • [Presentation] Proton induced coherent pion production.2007

    • Author(s)
      藤田 訓祐
    • Organizer
      INPC2007(International Nuclear Physics Conference)
    • Place of Presentation
      東京国際フォーラム
    • Year and Date
      2007-06-07
    • Related Report
      2007 Annual Research Report
  • [Presentation] 11^th International workshop on accelerator and beam utilization2007

    • Organizer
      Korea Atomic Energy Research Institute
    • Place of Presentation
      Nuclear Physics at CYRIC(招待講演)
    • Related Report
      2008 Final Research Report
  • [Presentation] 17th International Spin Physics Symposium(SPIN06)2006

    • Organizer
      Proton induced coherent pion production
    • Place of Presentation
      Kyoto, Japan
    • Related Report
      2008 Final Research Report
  • [Presentation] 国際会議 : 7^<th> International Conference on Charged Particle Optics2006

    • Organizer
      Beam diagnosis system for high resolution beam transportation
    • Place of Presentation
      Trinity, College, Cambridge, England
    • Related Report
      2008 Final Research Report
  • [Remarks] 本研究課題に関連する下記の研究会主催。RCNP研究会「超新星爆発とニュートリノ原子核反応」・日時 : 平成19年3月2日~3日・場所 : 大阪大学・核物理研究センター(RCNP)・研究会ホームページ・26講演、参加者50名

    • URL

      http://www.rcnp.osaka-u.ac.jp/~sakemi/snWS.html

    • Related Report
      2008 Final Research Report
  • [Remarks] 本研究課題による学位取得者(大阪大学)1名。学位論文は下記のホームページ

    • URL

      http://cycgw1.cyric.tohoku.ac.jp/~sakemi/cpp.pdf

    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://www.rcnp.osaka-u.ac.jp/~sakemi/CPP.html

    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://cycgwl.cyric.tohoku.ac.jp/index.html

    • Related Report
      2008 Annual Research Report
  • [Remarks]

    • URL

      http://cycgw1.cyric.tohoku.ac.jp/index.html

    • Related Report
      2007 Annual Research Report

URL: 

Published: 2006-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi