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2017 Fiscal Year Annual Research Report

二重閉殻核Sn-100およびSn-132周辺の単粒子構造

Research Project

Project/Area Number 16F16323
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

櫻井 博儀  国立研究開発法人理化学研究所, 仁科加速器研究センター, 主任研究員 (70251395)

Co-Investigator(Kenkyū-buntansha) BROWNE FRANK  国立研究開発法人理化学研究所, 仁科加速器研究センター, 外国人特別研究員
Project Period (FY) 2016-11-07 – 2019-03-31
Keywords不安定核の構造 / 単粒子軌道 / 核子ノックアウト反応 / インビームガンマ分光
Outline of Annual Research Achievements

平成29年度は理化学研究所「RIビームファクトリー」(RIBF)で核子ノックアウト反応の実験を行った。研究領域は中性子過剰なAr, Ca, Ti同位体であるが、ここで得られた核子ノックアウト反応の知見は、Sn-100やSn-132周辺の核構造研究に将来生かすことができる。実験では、厚い液体水素標的システムMINOS、高効率ガンマ線検出器DALI2、高運動量アクセプタンス磁気分析装置SAMURAIを組み合わせ、未知核のガンマ遷移データを大量に取得することに成功した。
偶奇核や奇奇核に比べ比較的スピーディーに解析および理論的解釈が可能な偶偶核、とくにCa-56を解析対象として選択し、すでにプレリミナリーな結果を得ている。中性子過剰なCa同位体の核構造に対して三体力効果が無視できないとする議論があり、また、新魔法数34の頑健性に関する議論を発展させるために、Ca-56の励起準位情報が熱望されていた。この結果は新魔法数34の頑健性を支持するものであり、国際会議などでも発表している。現在、投稿論文を準備している段階である。
この他に二つの主な研究実績がある。一つはSn-136のクーロン励起による電気四重極遷移確率の測定実験を代表者としてまとめ、RIBFの国際課題採択委員会に申請した。もう一つは、過去に取得したデータを第一著者としてまとめ、Physical Review Cに論文出版している。この結果はZr-102の核異性体の観測からZr-102はSr-100と異なり、ガンマソフトな原子核ではないと結論している。

Research Progress Status

翌年度、交付申請を辞退するため、記入しない。

Strategy for Future Research Activity

翌年度、交付申請を辞退するため、記入しない。

  • Research Products

    (23 results)

All 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (15 results) (of which Int'l Joint Research: 15 results,  Peer Reviewed: 15 results) Presentation (7 results) (of which Int'l Joint Research: 7 results,  Invited: 2 results)

  • [Int'l Joint Research] IRFU(フランス)

    • Country Name
      FRANCE
    • Counterpart Institution
      IRFU
  • [Journal Article] Observation of New Neutron-rich Isotopes among Fission Fragments from In-flight Fission of 345 MeV/nucleon 238U: Search for New Isotopes Conducted Concurrently with Decay Measurement Campaigns2018

    • Author(s)
      Shimizu Yohei、et al.
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 87 Pages: 014203~014203

    • DOI

      10.7566/JPSJ.87.014203

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nuclear structure and β-decay schemes for Te nuclides beyond N=822017

    • Author(s)
      Moon B.、et al.
    • Journal Title

      Physical Review C

      Volume: 95 Pages: 044322

    • DOI

      10.1103/PhysRevC.95.044322

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Low-lying structure and shape evolution in neutron-rich Se isotopes2017

    • Author(s)
      Chen S.、et al.
    • Journal Title

      Physical Review C

      Volume: 95 Pages: 041302(R)

    • DOI

      10.1103/PhysRevC.95.041302

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Observation of new neutron-rich Mn, Fe, Co, Ni, and Cu isotopes in the vicinity of Ni782017

    • Author(s)
      Sumikama T.、et al.
    • Journal Title

      Physical Review C

      Volume: 95 Pages: 05160(R)

    • DOI

      10.1103/PhysRevC.95.051601

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60: First Spectroscopy of Kr98,1002017

    • Author(s)
      Flavigny F.、et al.
    • Journal Title

      Physical Review Letters

      Volume: 118 Pages: 242501

    • DOI

      10.1103/PhysRevLett.118.242501

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Shell Evolution towards Ni78: Low-Lying States in Cu772017

    • Author(s)
      Sahin E.、et al.
    • Journal Title

      Physical Review Letters

      Volume: 118 Pages: 242502

    • DOI

      10.1103/PhysRevLett.118.242502

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] In-beam γ-ray spectroscopy of the neutron-rich platinum isotope Pt200 toward the N=126 shell gap2017

    • Author(s)
      John P. R.、et al.
    • Journal Title

      Physical Review C

      Volume: 95 Pages: 064321

    • DOI

      10.1103/PhysRevC.95.064321

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra2017

    • Author(s)
      Lettmann M.、et al.
    • Journal Title

      Physical Review C

      Volume: 96 Pages: 011301

    • DOI

      10.1103/PhysRevC.96.011301

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] β-decay scheme of Te140 to I140: Suppression of Gamow-Teller transitions between the neutron h9/2 and proton h11/2 partner orbitals2017

    • Author(s)
      Moon B.、et al.
    • Journal Title

      Physical Review C

      Volume: 96 Pages: 014325

    • DOI

      10.1103/PhysRevC.96.014325

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] K selection in the decay of the (ν52[532]?32[411])4 isomeric state in Zr1022017

    • Author(s)
      Browne F.、et al.
    • Journal Title

      Physical Review C

      Volume: 96 Pages: 024309

    • DOI

      10.1103/PhysRevC.96.024309

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Isomer-delayed γ-ray spectroscopy of A=159-164 midshell nuclei and the variation of K-forbidden E1 transition hindrance factors2017

    • Author(s)
      Patel Z.、et al.
    • Journal Title

      Physical Review C

      Volume: 96 Pages: 034305

    • DOI

      10.1103/PhysRevC.96.034305

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Observation of a γ -decaying millisecond isomeric state in 128 Cd 802017

    • Author(s)
      Jungclaus A.、et al.
    • Journal Title

      Physics Letters B

      Volume: 772 Pages: 483~488

    • DOI

      10.1016/j.physletb.2017.07.006

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Properties of γ-decaying isomers and isomeric ratios in the Sn100 region2017

    • Author(s)
      Park J.、et al.
    • Journal Title

      Physical Review C

      Volume: 96 Pages: 044311

    • DOI

      10.1103/PhysRevC.96.044311

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81,82,83,84 Zn2017

    • Author(s)
      Shand C.M.、et al.
    • Journal Title

      Physics Letters B

      Volume: 773 Pages: 492~497

    • DOI

      10.1016/j.physletb.2017.09.001

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Persistence of the Z=28 Shell Gap Around Ni78: First Spectroscopy of Cu792017

    • Author(s)
      Olivier L.、et al.
    • Journal Title

      Physical Review Letters

      Volume: 119 Pages: 192501

    • DOI

      10.1103/PhysRevLett.119.192501

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] In-beam γ-ray spectroscopy of 54,56Ca2018

    • Author(s)
      Frank Browne et al.
    • Organizer
      IV th Topical Workshop on Modern Aspects in Nuclear Structure
    • Int'l Joint Research
  • [Presentation] The lifetimes of the first-excited 2 + states in 104Zr and 106 Zr: the first measurement using a fast-timing array at a fast-fragmentation facility2017

    • Author(s)
      Frank Browne
    • Organizer
      Institute of Physics Nuclear Physics General Meeting
    • Int'l Joint Research / Invited
  • [Presentation] Detailed spectroscopy of 54Ca2017

    • Author(s)
      Frank Browne et al.
    • Organizer
      6th SUNFLOWER Workshop
    • Int'l Joint Research
  • [Presentation] Coulomb excitation of 136Sn2017

    • Author(s)
      Frank Browne et al.
    • Organizer
      6th SUNFLOWER Workshop
    • Int'l Joint Research
  • [Presentation] In-beam γ-ray spectroscopy of 54Ca2017

    • Author(s)
      Frank Browne et al.
    • Organizer
      International Workshop on “Physics Opportunities using CAGRA and RCNP tracking Ge detector” (CAGRA17)
    • Int'l Joint Research
  • [Presentation] Isomerism of 115Mo (and 109-113Mo)2017

    • Author(s)
      Frank Browne
    • Organizer
      Collaboration workshop on RI and heavy-ion sciences
    • Int'l Joint Research / Invited
  • [Presentation] In-beam γ-ray spectroscopy of 54,56Ca: Probing the tensor and three body force2017

    • Author(s)
      Frank Browne et al.
    • Organizer
      Perspectives of the physics of nuclear structure
    • Int'l Joint Research

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Published: 2018-12-17  

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