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

中性子過剰な希土類同位体の崩壊分光

Research Project

Project/Area Number 11F01752
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field 素粒子・原子核・宇宙線・宇宙物理(実験)
Research InstitutionThe Institute of Physical and Chemical Research

Principal Investigator

櫻井 博儀  独立行政法人理化学研究所, 仁科加速器研究センター, 主任研究員

Co-Investigator(Kenkyū-buntansha) SODERSTROM Par-anders  独立行政法人理化学研究所, 仁科加速器研究センター, 外国人特別研究員
SODERSTROM Par-Anders  独立行政法人理化学研究所, 櫻井RI物理研究室, 外国人特別研究員
Project Period (FY) 2011 – 2013
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2013: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2012: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2011: ¥600,000 (Direct Cost: ¥600,000)
Keywords希土類同位体 / 中性子過剰核 / 核構造 / 崩壊分光 / 集団性 / r-過程 / γ線検出 / 中性子過剰
Research Abstract

本研究では、理化学研究所の加速器施設「RIビームファクトリー(RIBF)」で中性子過剰な希土類同位体を生成し、その特異な核構造および集団性をベ一タ遅発γ線分光やアイソマーγ線分光で調べることにある。欧州から輸入されたクラスター型ゲルマニウム検出器システムEURICAでγ線を、理研で開発されたシリコン検出器でベ一タ線を測定する。
1. 一昨年度末から咋年度末にかけて、EURICA建設とテスト実験に従事し、そのシステム全体の構成と性能をNuclear Instrumentations and Methods誌に第一著者として論文掲載した。
2. 昨年度春から秋の本実験を成功させ、大量の崩壊分光データを取得した。特に秋の実験では、質量数110から130の中性子過剰な領域のベータ遅発γ線の観測に成功し、集団性に関わる興味深いデータを取得した。彼の発案で時間分解能に優れているLaBr3検出器を英国から持ち込み、励起準位寿命の測定も付加的に進め、質的に高いデータを取ることにも成功している。データ取得後、ただちにデータ解析を行い、Ruの励起準位の観測および集団性に関する結果をまとめ、PhysicalReviewC誌に第一著者として論文投稿した。これはEURICA実験で得られた初の成果である。同時に、Pd-126,128のアイソマー状態の発見からPdの中性子過剰領域で、中性子数N=82の魔法数が消えないことを見出し、Physical Review Lettersに論文を発表した。
3. RIBF国際実験課題採択委員会に申請し、認められたプログラムは本年度中に行う予定であったが、RIBFの運転費が削減され、行うことはできなかったが、中性子過剰な希土類同位体の分光にむけ、準備を行っている。

Strategy for Future Research Activity

(抄録なし)

Report

(3 results)
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (20 results)

All 2013 2012

All Journal Article (17 results) (of which Peer Reviewed: 15 results) Presentation (3 results)

  • [Journal Article] Shell evolution in ^<116,118>Ru : Triaxiality and transition between the O (6) and U (5) dynamical symmetries2013

    • Author(s)
      P. -A. Sӧderstrӧm, 他
    • Journal Title

      Physical Review C

      Volume: 88 Issue: 2 Pages: 24301-24301

    • DOI

      10.1103/physrevc.88.024301

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Half-life of the yrast 2^+ state in ^<188>W : Evolution of deformation and collectivity in neutron-rich tungsten isotopes2013

    • Author(s)
      P. J. R. Mason, 他
    • Journal Title

      Physical Review C

      Volume: 88 Pages: 44031-44031

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Isomers in ^<128>Pd and ^<126>Pd : Evidence for a Robust Shell Closure at the Neutron Magic Number 82 in Exotic Palladium Isotopes2013

    • Author(s)
      H. Watanabe, 他
    • Journal Title

      Physical Review Letters

      Volume: 111 Issue: 15 Pages: 152501-152501

    • DOI

      10.1103/physrevlett.111.152501

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evidence for a new nuclear 'magic number' from the level structure of ^<54>Ca2013

    • Author(s)
      D. Steppenbeck, 他
    • Journal Title

      Nature

      Volume: 502 Issue: 7470 Pages: 207-210

    • DOI

      10.1038/nature12522

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Design and test of a high-speed flash ADC mezzanine card for high-resolution and timing performance in nuclear structure experiments2013

    • Author(s)
      F. J. Egea, 他
    • Journal Title

      IEEE Transaction on Nuclear Science

      Volume: 60 Issue: 5 Pages: 3526-3531

    • DOI

      10.1109/tns.2013.2281241

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Half-life Measurements of Excited States in ^<132>Te, ^<134>Xe2013

    • Author(s)
      O. J. Roberts, 他
    • Journal Title

      Acta Phyicsa Polonica B

      Volume: 44 Issue: 3 Pages: 403-406

    • DOI

      10.5506/aphyspolb.44.403

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Investigating the strength of the N=34 subshell closure in ^<54>Ca2013

    • Author(s)
      D. Steppenbeck, 他
    • Journal Title

      Journal of Physics ; Conference Series

      Volume: 445 Pages: 12012-12012

    • DOI

      10.1088/1742-6596/445/1/012012

    • Related Report
      2013 Annual Research Report
  • [Journal Article] Installation and commissioning of EURICA-Euroball-RIKEN Cluster Array2013

    • Author(s)
      P. -A. Sӧderstrӧm, 他
    • Journal Title

      Nuclear Instrumentations and Methods B

      Volume: 317 Pages: 649-652

    • DOI

      10.1016/j.nimb.2013.03.018

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-spin structure in ^<40>K2012

    • Author(s)
      P. -A. Soderstrom, 他
    • Journal Title

      Physical Review C

      Volume: 86 Issue: 5 Pages: 54320-54320

    • DOI

      10.1103/physrevc.86.054320

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of the np interaction on the beta decay of ^<94>pd2012

    • Author(s)
      B. S. Nara Singh, 他
    • Journal Title

      Physical Review C

      Volume: 86 Issue: 4 Pages: 41301-41301

    • DOI

      10.1103/physrevc.86.041301

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superallowed Gamow-Teller Decay of Doubly Magic ^<100>Sn2012

    • Author(s)
      C. Hinke, 他
    • Journal Title

      Nature

      Volume: 486 Issue: 7403 Pages: 341-341

    • DOI

      10.1038/nature11116

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] ^7Li-Induced Reactions for Fast-Timing With LaBr_3 : Ce Detectors2012

    • Author(s)
      R J. R. Mason, 他
    • Journal Title

      AIP Conf. Proc.

      Volume: 1491 Pages: 93-93

    • DOI

      10.1063/1.4764210

    • Related Report
      2012 Annual Research Report
  • [Journal Article] Monte Carlo Simulations of a Single Detector Unit for the Neutron Detector Array NEDA2012

    • Author(s)
      G. Jaworski, 他
    • Journal Title

      Nucl. Instrum. Meth. A

      Volume: 673 Pages: 64-64

    • DOI

      10.1016/j.nima.2012.01.017

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] AGATA - Advanced GAmma Tracking Array2012

    • Author(s)
      S. Akkoyun, 他
    • Journal Title

      Nucl. Instrum. Meth. A

      Volume: 668 Pages: 26-58

    • DOI

      10.1016/j.nima.2011.11.081

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nuclear deformations in the region of the A=160 r-process abundance peak2012

    • Author(s)
      P. -A. Soderstrom, 他
    • Journal Title

      Phys. Scr., T

      Volume: 150 Pages: 14038-14038

    • DOI

      10.1088/0031-8949/2012/t150/014038

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin-gap isomer in ^<96>Cd2012

    • Author(s)
      R. Wadsworth, 他
    • Journal Title

      J. Phys. Conf. Ser.

      Volume: 381 Pages: 12074-12074

    • DOI

      10.1088/1742-6596/381/1/012074

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Study of the Order-to-Chaos transition in ^<174>W with the AGATA Demonstrator2012

    • Author(s)
      V. Vandone, 他
    • Journal Title

      J. Phys. Conf. Ser.

      Volume: 366 Pages: 12045-12045

    • DOI

      10.1088/1742-6596/366/1/012045

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Presentation] Status of the EURICA Project After One Year at RIKEN (Poster)2013

    • Author(s)
      P. -A. Sӧderstrӧm
    • Organizer
      12th Asia Pacific Physics Conference
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2013-07-16
    • Related Report
      2013 Annual Research Report
  • [Presentation] Installation and Commissioning of EURICA - Euroball-RIKEN Cluster Array2012

    • Author(s)
      P. -A. Soderstrom, et al.
    • Organizer
      EMIS 2012 Conference
    • Place of Presentation
      Matsue, Japan
    • Year and Date
      2012-12-03
    • Related Report
      2012 Annual Research Report
  • [Presentation] Current status of EURICA2012

    • Author(s)
      P. -A. Soderstrom
    • Organizer
      NUSTAR week in Kolkata
    • Place of Presentation
      Kolkata, India(招待講演)
    • Year and Date
      2012-10-12
    • Related Report
      2012 Annual Research Report

URL: 

Published: 2011-12-22   Modified: 2024-03-26  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi