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Study of excited nuclear states by using double arm spectrometers

Research Project

Project/Area Number 21K03599
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionOsaka University

Principal Investigator

Nobuyuki Kobayashi  大阪大学, 核物理研究センター, 准教授 (80750778)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywords原子核物理実験 / ハロー核 / 励起状態 / 中性子過剰核 / 原子核 / 中性子ハロー核 / 原子核実験 / 原子核反応
Outline of Research at the Start

本研究では、応募者が考案した手法により、原子核の励起状態の半径を世界で初めて測定する。これまで、核の反応研究は基底状態のみを対象としており、励起状態に対する反応を扱うことは出来なかった。しかし、応募者の独自のアイディアに基づく本手法は核の励起状態に直接反応の手法を適用するものであり、これまで不可能とされてきた“原子核反応を用いた励起状態の構造研究”という新しい分野を開拓するものである。本研究の応用範囲は核物理全域に渡るものであるが、我々が始めにターゲットとする研究課題は、“励起状態に表れるハロー構造の探索”である。

Outline of Final Research Achievements

This research aims to measure the radius of the excited states of nuclei using newly developed method by us. This method applies a direct reaction method to the excited states of nuclei, which enable us to "study the structure of an excited state using nuclear reactions." This has been considered impossible until now.
As a result of this research, we obtained an idea to improve the ion optical setup of a double-arm spectrometer that was previously considered. Furthermore, the beam time for this demonstration experiment was proposed to the Facility for Rare Isotope Beams (FRIB) in US, and a beam time of 114 hours was approved. This indicates the possibility of expanding this research to a wider area in the future.

Academic Significance and Societal Importance of the Research Achievements

本研究は、前人未踏の学術領域である「核図表のZ-N-Ex空間上の各領域にどのような構造が現れるか?また、その出現メカニズムは何か?」ということを実験的に直接反応を用いて研究を行うことである。これまで、基底状態(Z-N平面)において盛んに研究されてきた特異構造“ハロー構造”を持つ状態がZ-N-Ex空間上でどのように分布し、どのようなメカニズムで出現するのかという未解決問題が存在していた。本研究でこの領域に踏み込むことが可能になったことを定量的に示すことができた。これは、今後の実験におけるパラダイムシフトを起こす可能性を秘めた重要な成果である。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (16 results)

All 2024 2023 2022 2021

All Journal Article (14 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 10 results,  Open Access: 6 results) Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Mass, Spectroscopy, and Two-Neutron Decay of 16Be2024

    • Author(s)
      Monteagudo B.、Marqus F.M.、Gibelin J.、Orr N.A.、Corsi A.、Kubota Y.、Casal J.、Gmez-Camacho J.、Kobayashi N.
    • Journal Title

      Physical Review Letters

      Volume: 132 Issue: 8 Pages: 0825011-6

    • DOI

      10.1103/physrevlett.132.082501

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Large collectivity in 29Ne at the boundary of the island of inversion2023

    • Author(s)
      Revel A.、Wu J.、Iwasaki H.、Ash J.、Bazin D.、Brown B.A.、Chen J.、Elder R.、Farris P.、Gade A.、Grinder M.、Kobayashi N.、Li J.、Longfellow B.、Mijatovic T.、Pereira J.、Poves A.、Sanchez A.、Shimizu N.、Spieker M.、Utsuno Y.、Weisshaar D.
    • Journal Title

      Physics Letters B

      Volume: 838 Pages: 137704-137704

    • DOI

      10.1016/j.physletb.2023.137704

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Unbound states in 17C and p-sd shell-model interactions2022

    • Author(s)
      S. Kim, T. Nakamura, Y. Togano et al.
    • Journal Title

      Physics Letters B

      Volume: 836 Pages: 1376291-7

    • DOI

      10.1016/j.physletb.2022.137629

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spectroscopy of $$^\mathbf{17}$$C Above the Neutron Separation Energy2022

    • Author(s)
      Kim Sunji、Hwang Jongwon、Satou Yoshiteru、Orr Nigel A.、Nakamura Takashi、Kondo Yosuke、Gibelin Julien、... Nobuyuki Kobayashi
    • Journal Title

      Few-Body Systems

      Volume: 63 Issue: 1 Pages: 1-4

    • DOI

      10.1007/s00601-022-01725-5

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spectroscopy of the T = 3 over 2 A = 47 and A = 45 mirror nuclei via one- and two-nucleon knockout reactions2022

    • Author(s)
      Uthayakumaar S.、Bentley M. A.、Simpson E. C.、Haylett T.、Yajzey R.、Lenzi S. M.、Satu?a W.、... N. Kobayashi
    • Journal Title

      Physical Review C

      Volume: 106 Issue: 2 Pages: 024327-024327

    • DOI

      10.1103/physrevc.106.024327

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Candidates for the 5α condensed state in 20Ne2021

    • Author(s)
      Adachi S.、Fujikawa Y.、Kawabata T.、Akimune H.、Doi T.、Furuno T.、Harada T.、Inaba K.、Ishida S.、Itoh M.、Iwamoto C.、Kobayashi N.、Maeda Y.、Matsuda Y.、Murata M.、Okamoto S.、Sakaue A.、Sekiya R.、Tamii A.、Tsumura M.
    • Journal Title

      Physics Letters B

      Volume: 819 Pages: 136411-136411

    • DOI

      10.1016/j.physletb.2021.136411

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The structure of low-lying 1? states in 90,94Zr from (α,α′γ) and (p,p′γ) reactions2021

    • Author(s)
      Crespi F.C.L.、Bracco A.、Lanza E.G.、Tamii A.、Blasi N.、Camera F.、Wieland O.、Kobayashi N.
    • Journal Title

      Physics Letters B

      Volume: 816 Pages: 136210-136210

    • DOI

      10.1016/j.physletb.2021.136210

    • Related Report
      2021 Research-status Report
  • [Journal Article] Lifetime measurements probing collectivity in the ground-state band of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mn>32</mml:mn></mml:mmultiscripts></mml:math>2021

    • Author(s)
      Elder R.、Iwasaki H.、Ash J.、Bazin D.、Bender P. C.、Braunroth T.、Campbell C. M.、Crawford H. L.、Elman B.、Gade A.、Grinder M.、Kobayashi N.、Longfellow B.、Mijatovi? T.、Pereira J.、Revel A.、Rhodes D.、Weisshaar D.
    • Journal Title

      Physical Review C

      Volume: 104 Issue: 2

    • DOI

      10.1103/physrevc.104.024307

    • Related Report
      2021 Research-status Report
  • [Journal Article] Search for in-band transitions in the candidate superdeformed band in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Si</mml:mi><mml:mprescripts /><mml:none /><mml:mn>28</mml:mn></mml:mmultiscripts></mml:math>2021

    • Author(s)
      Morris L.、Jenkins D. G.、Harakeh M. N.、Isaak J.、Kobayashi N.、Tamii A.、et al.
    • Journal Title

      Physical Review C

      Volume: 104 Issue: 5

    • DOI

      10.1103/physrevc.104.054323

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] First experimental determination of the radiative-decay probability of the 3-1 state in 12C for estimating the triple alpha reaction rate in high temperature environments2021

    • Author(s)
      M. Tsumura,S. Kubono, et al.
    • Journal Title

      Physics Letters B

      Volume: 817 Pages: 136283-136283

    • DOI

      10.1016/j.physletb.2021.136283

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Proton-3He elastic scattering at intermediate energies2021

    • Author(s)
      A.Watanabe, S.Nakai, Y.Wada, K.Sekiguchi, M.Itoh, et al.
    • Journal Title

      Physical Review C

      Volume: 103 Issue: 4 Pages: 044001-044001

    • DOI

      10.1103/physrevc.103.044001

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Quasifree Neutron Knockout Reaction Reveals a Small s-Orbital Component in the Borromean Nucleus B172021

    • Author(s)
      Yang Z.H.、Kubota Y.、Corsi A.、Kondo Y. et al.
    • Journal Title

      Physical Review Letters

      Volume: 126 Issue: 8 Pages: 1-6

    • DOI

      10.1103/physrevlett.126.082501

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spectroscopy of the T?=?2 mirror nuclei 48Fe/48Ti using mirrored knockout reactions2021

    • Author(s)
      Yajzey R.、Bentley M.A.、Simpson E.C.、Haylett T.、Uthayakumaar S.、...、Nobuyuki Kobayashi、et al.
    • Journal Title

      Physics Letters B

      Volume: 823 Pages: 136757-136757

    • DOI

      10.1016/j.physletb.2021.136757

    • Related Report
      2021 Research-status Report
  • [Journal Article] Investigation of the isoscalar response of 24Mg to 6Li scattering2021

    • Author(s)
      Zamora J. C.、Sullivan C.、Zegers R. G. T.、...、Nobuyuki Kobayashi、et al.
    • Journal Title

      Physical Review C

      Volume: 104 Issue: 1

    • DOI

      10.1103/physrevc.104.014607

    • Related Report
      2021 Research-status Report
  • [Presentation] 数値シミュレーションを用いた Slope ADC の到達性能の研究2023

    • Author(s)
      小林信之
    • Organizer
      計測システム研究会2023@RCNP ~計測システム開発の現状と今後の展開~
    • Related Report
      2023 Annual Research Report
  • [Presentation] PANDORA Project -- Measurements of photo-nuclear reaction cross sections at RCNP2022

    • Author(s)
      Nobuyuki Kobayashi
    • Organizer
      Mean-field and Cluster Dynamics in Nuclear Systems 2022 (MCD2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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