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Study for halo-nuclei by mass measurements in storage-ring

Research Project

Project/Area Number 18H03695
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionUniversity of Tsukuba

Principal Investigator

Ozawa Akira  筑波大学, 数理物質系, 教授 (80260214)

Co-Investigator(Kenkyū-buntansha) 山口 由高  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, 技師 (40415328)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2018: ¥36,140,000 (Direct Cost: ¥27,800,000、Indirect Cost: ¥8,340,000)
Keywords原子核の質量 / 蓄積リング / 不安定核 / 質量測定
Outline of Final Research Achievements

RI Beam Factory in RIKEN (RIBF) is presently most intense unstable nuclear beam facility in the world. Rare-RI Ring (R3) in RIBF is motivated by mass measurements for unstable nuclei, that are located very far from the stability. R3 is operated from FY 2015. However, since R3 is shortly after the operation, accuracy for mass measurements was insufficient. In this research, we upgraded kicker magnets in R3 and detectors for mass measurements. Thus, we could increase the accuracy. Hereafter we will perform precise mass measurements for unstable nuclei in R3.

Academic Significance and Societal Importance of the Research Achievements

不安定核の蓄積リングは、質量測定だけでなく、寿命測定を行うことができる。また、多価イオンを蓄積できるので、多価状態のベータ崩壊など、通常とは異なる物理現象の観測も可能になる。理研RIビームファクトリー(RIBF)は、現在、世界最強のRIビーム施設であり、ハロー原子核を含む安定線から遠く離れた不安定核を数多く作ることができる。本研究により、RIBFの蓄積リングをアップグレードしたことで、RIBFでの不安定核研究をより高めることに貢献した。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report

Research Products

(19 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (6 results) Journal Article (10 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 10 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Int'l Joint Research] IMP(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      IMP
    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] GSI(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      GSI
    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] IMP(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      IMP
    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] GSI(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      GSI
    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] IMP(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      IMP
    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] GSI(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      GSI
    • Related Report
      2018 Annual Research Report
  • [Journal Article] Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring2021

    • Author(s)
      Nagae D., Ozawa A. (27th) et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 986 Pages: 164713~164713

    • DOI

      10.1016/j.nima.2020.164713

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental Challenges of the First Mass Measurement Campaign at the Rare-RI Ring2020

    • Author(s)
      Naimi S.、Ozawa A. (23rd)、et. al.
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1643 Pages: 012058~012058

    • DOI

      10.1088/1742-6596/1643/1/012058

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mass measurements for the Tz=?2fp-shell nuclei Ti40, Cr44, Mn46, Fe48, Co50, and Ni522020

    • Author(s)
      Fu C. Y.、Zhang Y. H.、Wang M.、Zhou X. H.、Litvinov Yu. A.、Blaum K.、Xu H. S.、Xu X.、Shuai P.、Lam Y. H.、Chen R. J.、Yan X. L.、Chen X. C.、He J. J.、Kubono S.、Sun M. Z.、Tu X. L.、Xing Y. M.、Zeng Q.、Zhou X.、Zhan W. L.、Litvinov S.、Audi G.、Uesaka T.、Yamaguchi T.、Ozawa A.、Sun B. H.、Sun Y.、Xu F. R.
    • Journal Title

      Physical Review C

      Volume: 102 Pages: 054311

    • DOI

      10.1103/PhysRevC.102.054311

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Masses of ground and isomeric states of In101 and configuration-dependent shell evolution in odd-A indium isotopes2019

    • Author(s)
      Xu X.、Ozawa A. (39th) et al.
    • Journal Title

      Physical Review C

      Volume: 100 Pages: 051303

    • DOI

      10.1103/PhysRevC.100.051303

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Masses of neutron-rich Sc52-54 and Ti54,56 nuclides: The N=32 subshell closure in scandium2019

    • Author(s)
      Xu X.、Ozawa A. (26th) et al.
    • Journal Title

      Physical Review C

      Volume: 99 Pages: 064303

    • DOI

      10.1103/PhysRevC.99.064303

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph2018

    • Author(s)
      Ito Y.、Schury P.、Wada M.、Arai F.、Haba H.、Hirayama Y.、Ishizawa S.、Kaji D.、Kimura S.、Koura H.、MacCormick M.、Miyatake H.、Moon J.Y.、Morimoto K.、Morita K.、Mukai M.、Murray I.、Niwase T.、Okada K.、Ozawa A.、Rosenbusch M.、Takamine A.、Tanaka T.、Watanabe Y.X.、Wollnik H.、Yamaki S.
    • Journal Title

      Physical Review Letters

      Volume: 120 Pages: 152501

    • DOI

      10.1103/PhysRevLett.120.152501

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Isochronous mass measurements of Tz=-1 fp-shell nuclei from projectile fragmentation of Ni582018

    • Author(s)
      Zhang Y. H.、Ozawa A. (33rd) et. al.
    • Journal Title

      Physical Review C

      Volume: 98 Pages: 014319

    • DOI

      10.1103/PhysRevC.98.014319

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes2018

    • Author(s)
      Xing Y.M.、Ozawa A. (44th) et al.
    • Journal Title

      Physics Letters B

      Volume: 781 Pages: 358~363

    • DOI

      10.1016/j.physletb.2018.04.009

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes2018

    • Author(s)
      Rosenbusch M.、Ito Y.、Schury P.、Wada M.、Kaji D.、Morimoto K.、Haba H.、Kimura S.、Koura H.、MacCormick M.、Miyatake H.、Moon J. Y.、Morita K.、Murray I.、Niwase T.、Ozawa A.、Reponen M.、Takamine A.、Tanaka T.、Wollnik H.
    • Journal Title

      Physical Review C

      Volume: 97 Pages: 064306

    • DOI

      10.1103/PhysRevC.97.064306

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Masses of the Tz=-3/2 nuclei P27 and S292018

    • Author(s)
      Fu C. Y.、Ozawa A. (33rd) et al.
    • Journal Title

      Physical Review C

      Volume: 98 Pages: 014315

    • DOI

      10.1103/PhysRevC.98.014315

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Present status of Rare-RI Ring (R3) and mass measurements2020

    • Author(s)
      A. Ozawa
    • Organizer
      RIBF Users Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mass measurements for Ni-isotopes in Rare-RI Ring, RIBF2019

    • Author(s)
      A. Ozawa
    • Organizer
      hina-Japan Collaboration Workshop on “Nuclear Mass and Life for Unraveling Mysteries of R-process”
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mass measurements in Rare-RI Ring in RIBF2018

    • Author(s)
      A. Ozawa
    • Organizer
      Workshop on “Physics at HIAF High-Energy Beam Lines”
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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