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

原子核のスピン分布制御という新手法を用いた中性子超過剰核の構造の研究

Research Project

Project/Area Number 16J05919
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

西畑 洸希  国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 特別研究員(PD)

Project Period (FY) 2016-04-22 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords不安定原子核
Outline of Annual Research Achievements

本研究は中性子数(もしくは陽子数)が陽子数(中性子数)に比べて極端に多い中性子(陽子)過剰不安定原子核構造はどのようになっているか、という原子核物理学の重要課題の一つとなっている。その中でも中性子数20付近の中性子過剰な原子核の構造はその特異な構造から非常に注目を集めている原子核領域である。本研究では、中性子過剰なNe同位体の基底状態について基本的な物理学量である電磁気モーメントを測定することで、基底状態の単一粒子状態や変形について系統的なデータを取得し、中性子数20領域の詳細な原子核構造を議論することを目的とする。
本研究では中性子過剰なNeの電磁気モーメントを測定するために、ベータNMRと空間的にスピンをある方向に偏らせた(スピン偏極した)不安定核ビームを組み合わせるという新たな手法を考案し、そのために必要な開発研究を行った。希ガスであるNeでのベータNMRに利用可能な停止素材のデータは非常に少なく、この研究には、まずNeを用いてベータNMRが可能な単結晶素材を探す必要がある。そのために、昨年度理化学研究所の不安定原子核生成装置RIPSを用いて実験を行った。その結果について本年度詳細な解析を行い、ZnOがNeのベータNMRに非常に有効であると新たに分かった。本年度は、その結果について解析を行い、論文としてまとめている。
加えて、本年度は実施できなかったがスピン整列ビームを用いての原理実証実験も放射線医学総合研究所のHIMACにて計画しており、本年度はその準備も行った。この実験は、理化学研究所RIBFで計画している中性子過剰なNeの本実験と同じシステムを用いるため、その測定システムの構築も本年度行った。

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (27 results)

All 2019 2018 2017 2016

All Journal Article (20 results) (of which Int'l Joint Research: 19 results,  Peer Reviewed: 20 results,  Open Access: 4 results,  Acknowledgement Compliant: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Journal Article] Structure of Mg31: Shape coexistence revealed by β-γ spectroscopy with spin-polarized Na312019

    • Author(s)
      Nishibata H.、Kanaya S.、Shimoda T.、Odahara A.、Morimoto S.、Yagi A.、Kanaoka H.、Pearson M. R.、Levy C. D. P.、Kimura M.、Tsunoda N.、Otsuka T.
    • Journal Title

      Physical Review C

      Volume: 99 Issue: 2 Pages: 024322-024322

    • DOI

      10.1103/physrevc.99.024322

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Identification of New Neutron-Rich Isotopes in the Rare-Earth Region Produced by 345 MeV/nucleon 238U2018

    • Author(s)
      N.Fukuda, T.Kubo, D.Kameda, N.Inabe, H.Suzuki, Y.Shimizu, H.Takeda, K.Kusaka, Y.Yanagisawa, M.Ohtake, H. Nishibata 他
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 87 Issue: 1 Pages: 014202-014202

    • DOI

      10.7566/jpsj.87.014202

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [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 Issue: 1 Pages: 014203-014203

    • DOI

      10.7566/jpsj.87.014203

    • Related Report
      2017 Annual Research Report
    • 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 Issue: 3 Pages: 034305-034305

    • DOI

      10.1103/physrevc.96.034305

    • Related Report
      2017 Annual Research Report
    • 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

    • Related Report
      2017 Annual Research Report
    • 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 Issue: 5 Pages: 051601-051601

    • DOI

      10.1103/physrevc.95.051601

    • Related Report
      2017 Annual Research Report
    • 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 Issue: 24 Pages: 242502-242502

    • DOI

      10.1103/physrevlett.118.242502

    • Related Report
      2017 Annual Research Report
    • 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 Issue: 1 Pages: 014325-014325

    • DOI

      10.1103/physrevc.96.014325

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nuclear structure and b-decay schemes for Te nuclides beyond N = 822017

    • Author(s)
      B. Moon, ..., S. Nishimura et al.
    • Journal Title

      Physical Review C

      Volume: 95 Issue: 4 Pages: 044322-044322

    • DOI

      10.1103/physrevc.95.044322

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Shape coexistence in the N=19 neutron-rich nucleus 31Mg explored by β-γ spectroscopy of spin-polarized 31Na2017

    • Author(s)
      H.Nishibata, T.Shimoda, A.Odahara, S.Morimoto, S.Kanaya, A.Yagi, H.Kanaoka, M.R.Pearson, C.D.P.Levy, M.Kimura
    • Journal Title

      Physics Letters

      Volume: B767 Pages: 81-85

    • DOI

      10.1016/j.physletb.2017.01.049

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] beta-Decay Half-Lives of Neutron-Rich Cs-55 to Ho-67: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation2017

    • Author(s)
      J. Wu, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review Letters

      Volume: 118 Issue: 7 Pages: 072701-072701

    • DOI

      10.1103/physrevlett.118.072701

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd2017

    • Author(s)
      P.J.Davies, H.Grawe, K.Moschner, A.Blazhev, R.Wadsworth, P.Boutachkov, F.Ameil, A.Yagi, H.Baba, T.Back, M.Dewald, P.Doornenbal, T.Faestermann, A.Gengelbach, J.Gerl, R.Gernhaeuser, S.Go, M.Gorska, E.Gregor. H. Nishibata 他
    • Journal Title

      Phys. Lett. B

      Volume: 767 Pages: 474-479

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New K isomers in the neutron-rich N=100 isotones 162Sm, 163Eu, and 164Gd2017

    • Author(s)
      R. Yokoyama, H. Baba, K. Ieki, et al.
    • Journal Title

      Physical Review C

      Volume: 95 Issue: 3 Pages: 034313-034313

    • DOI

      10.1103/physrevc.95.034313

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Large-scale shell model study of the newly found isomer in 136La2016

    • Author(s)
      E.Teruya, N.Yoshinaga, K.Higashiyama, H.Nishibata, A.Odahara, T.Shimoda
    • Journal Title

      Phys. Rev. C

      Volume: 94 Issue: 1 Pages: 014317-014317

    • DOI

      10.1103/physrevc.94.014317

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Proton-hole and core-excited states in the semi-magic nucleus In-131(82)2016

    • Author(s)
      J. Taprogge, H. Baba, T. Isobe, et al.
    • Journal Title

      European Physical Journal A

      Volume: 52 Issue: 11 Pages: 347-347

    • DOI

      10.1140/epja/i2016-16347-y

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First Results on the Excited States in 77Cu2016

    • Author(s)
      E.Sahin, F.L.Bello Garrote, A.Gorgen, G.de Angelis, M.Niikura, S.Nishimura, D.Mengoni, Z.Xu, H.Baba, F.Browne, P.Doornenbal, S.Franchoo, G.Guillaume, T.Isobe, P.R.John, H.S.Jung, K.K.Hadynska-Klek, Z.Li, G.Lorusso, H. Nishibata 他
    • Journal Title

      Acta Phys. Pol. B

      Volume: 47 Issue: 3 Pages: 889-895

    • DOI

      10.5506/aphyspolb.47.889

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Magnetic moment of the 13/2+ isomeric state in 69Cu: Spin alignment in the one-nucleon removal reaction2016

    • Author(s)
      A.Kusoglu, G.Georgiev, C.Sotty, D.L.Balabanski, A.Goasduff, Y.Ishii, Y.Abe, K.Asahi, M.Bostan, R.Chevrier, M.Chikamori, J.M.Daugas, T.Furukawa, H.Nishibata, Y.Ichikawa, Y.Ishibashi, R.Lozeva, H.Miyatake, D.Nagae, T.Nanao 他
    • Journal Title

      Phys. Rev. C

      Volume: 93 Issue: 5

    • DOI

      10.1103/physrevc.93.054313

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] beta decay of semi-magic Cd-130: Revision and extension of the level scheme of In-1302016

    • Author(s)
      A. Jungclaus, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review C

      Volume: 94 Issue: 2 Pages: 024303-024303

    • DOI

      10.1103/physrevc.94.024303

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First observation of γ rays emitted from excited states south-east of 132Sn: The π g-9/2 x νf7/2 multiplet of 132In832016

    • Author(s)
      A. Jungclaus, ..., S. Nishimura et al.
    • Journal Title

      Physical Review C

      Volume: 93 Issue: 4 Pages: 041301-041301

    • DOI

      10.1103/physrevc.93.041301

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] μs isomers of Nd-158,Nd-1602016

    • Author(s)
      E. Ideguchi, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review C

      Volume: 94 Issue: 6 Pages: 064322-064322

    • DOI

      10.1103/physrevc.94.064322

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 偏極Naビームで探る中性子過剰原子核30Mg, 31Mgの多様な原子核構造2019

    • Author(s)
      西畑 洸希
    • Organizer
      日本物理学会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Structure of neutron-rich 31Mg by β-decay spectroscopy of spin-polarized 31Na2019

    • Author(s)
      H. Nishibata
    • Organizer
      5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Shape coexistence in 31Mg revealed by b-g and b-g-n spectroscopy with spin-polarized 31Na2018

    • Author(s)
      H. Nishibata
    • Organizer
      The IX International Symposium on Exotic Nuclei (EXON2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] スピン偏極 スピン偏極 スピン偏極 スピン偏極 23Ne ビームを用いた単結晶電場勾配測定2017

    • Author(s)
      西畑 洸希
    • Organizer
      日本物理学会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Shape coexistence in neutron-rich 31Mg investigated by beta-gamma spectroscopy of spin-polarized 31Na2017

    • Author(s)
      H. Nishibata
    • Organizer
      The third International Conference on Advances in Radioactive Isotope Science, ARIS2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Various structures of the neutron-rich nucleus 31Mg investigated by beta-gamma spectroscopy of spin-polarized 31Na2016

    • Author(s)
      H. Nishibata
    • Organizer
      SPIN2016
    • Place of Presentation
      Illinois, America
    • Year and Date
      2016-09-25
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Various Structure In Neutron-rich 31Mg Studied By Using Spin-polarized 31Na Beam2016

    • Author(s)
      H. Nishibata
    • Organizer
      INPC2016
    • Place of Presentation
      Adelaide, Australia
    • Year and Date
      2016-09-11
    • Related Report
      2016 Annual Research Report

URL: 

Published: 2016-05-17   Modified: 2024-03-26  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi