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Verification of tetra-neutron resonance by nuclear reaction of RI beam

Research Project

Project/Area Number 16H02177
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionInstitute of Physical and Chemical Research (2020, 2022)
The University of Tokyo (2016-2019)

Principal Investigator

Shimoura Susumu  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, 協力研究員 (10170995)

Co-Investigator(Kenkyū-buntansha) 道正 新一郎  東京大学, 大学院理学系研究科(理学部), 助教 (80392140)
Project Period (FY) 2016-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥46,150,000 (Direct Cost: ¥35,500,000、Indirect Cost: ¥10,650,000)
Fiscal Year 2020: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2017: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2016: ¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
KeywordsRIビーム / 中性子多体系 / 質量欠損核分光 / 荷電交換反応 / アルファノックアウト反応 / 多核子移行反応 / 原子核物理学
Outline of Final Research Achievements

The candidate tetra-neutron resonance reported by the measurement of the 4He(8He,8Be) reaction was reexamined. The re-measurements of the same reaction was performed with better accuracy and statistics. The alpha knockout reaction 8He(p,p,α) reaction was measured, which showed a consistent mass spectrum with 10 times better statistics. The energy and the width of the candidate have been deduced, indicating that the candidate remains 10 times more periods than the reaction time scale.

Academic Significance and Societal Importance of the Research Achievements

中性子だけで構成された原子核-原子番号0の元素-の存在は原子核物理学における60年以上にわたる課題であった。本研究の開始直前に発表された4事象発見されたテトラ中性子共鳴の候補は、準安定な状態として4中性子が存在する可能性を示唆した。本研究はこれを検証することを目的に再測定と全く異なる反応を用いた測定を行い、その結果、閾値直上に強く相関したテトラ中性子状態が存在することを示した。

Report

(6 results)
  • 2022 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (51 results)

All 2022 2021 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (10 results) Journal Article (12 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 11 results,  Open Access: 5 results) Presentation (28 results) (of which Int'l Joint Research: 23 results,  Invited: 24 results) Remarks (1 results)

  • [Int'l Joint Research] IPC-CAEN/IPN-Orsay(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ダルムシュタット工科大学(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] IBS(韓国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] IPC-Caeb/IPN-Orsay(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Darmstadt工科大学(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] LPC-Caen/IPN-Orsay(フランス)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Darmstadt工科大学(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] LPC-Caen/IPN-Orsay(フランス)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Darmstadt工科大学(ドイツ)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] LPC-Caen/IPN-Orsay(フランス)

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Observation of a correlated free four-neutron system2022

    • Author(s)
      M. Duer, T. Nakamura, Y. Togano et al.
    • Journal Title

      Nature

      Volume: 606 Issue: 7915 Pages: 678-682

    • DOI

      10.1038/s41586-022-04827-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Experimental Study of 4n by Directly Detecting the Decay Neutrons2021

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

      Few-Body Systems

      Volume: 62 Issue: 4 Pages: 1021-7

    • DOI

      10.1007/s00601-021-01691-4

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Extended Migdal-Watson formula to evaluate background strength in binary breakup reactions2021

    • Author(s)
      R. Nakamoto, M. Ito, A. Saito and S. Shimoura
    • Journal Title

      Physical Review C

      Volume: 104 Issue: 3 Pages: 034602-034602

    • DOI

      10.1103/physrevc.104.034602

    • URL

      https://pure.teikyo.jp/en/publications/1880e9c3-a413-4c15-a3e4-1147c471258b

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Continuum Strength of Direct Breakup Induced by External Isoscalar Field2021

    • Author(s)
      Nakamoto R.、Ito M.、Saito A.、Shimoura S.
    • Journal Title

      Few-Body Systems

      Volume: 62 Issue: 4 Pages: 107-107

    • DOI

      10.1007/s00601-021-01669-2

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New energy-degrading beamline for in-flight RI beams, OEDO2020

    • Author(s)
      Michimasa S.、Imai N.、Dozono M.、Hwang J.W.、Kondo Y.、Nakamura T. et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 463 Pages: 143-147

    • DOI

      10.1016/j.nimb.2019.06.006

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental study of <sup>4</sup>n with <sup>8</sup>He(p,2p) reaction2020

    • Author(s)
      Huang S. W., Yang H.、Shimoura S., et al.
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1643 Issue: 1 Pages: 012090-012090

    • DOI

      10.1088/1742-6596/1643/1/012090

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Performance of the OEDO beamline2020

    • Author(s)
      J.W. Hwang, S. Michimasa, K. Yamada et al.
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1643 Issue: 1 Pages: 1-6

    • DOI

      10.1088/1742-6596/1643/1/012035

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] OEDO, the energy-degrading beamline at RI Beam Factory2019

    • Author(s)
      Michimasa Shin'ichiro, Hwang Jongwon, Yamada Kazunari, Shimoura Susumu, et al.
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2019 Issue: 4

    • DOI

      10.1093/ptep/ptz007

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Angle-tunable wedge degrader for an energy-degrading RI beamline2019

    • Author(s)
      Hwang Jongwon, Michimasa Shin'ichiro, Shimoura Susumu, et al.
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2019 Issue: 4

    • DOI

      10.1093/ptep/ptz028

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct reactions as quantum probes for nuclei2018

    • Author(s)
      Shimoura Susumu
    • Journal Title

      The European Physical Journal Plus

      Volume: 133 Issue: 11 Pages: 463-473

    • DOI

      10.1140/epjp/i2018-12343-0

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] テトラ中性子の探査2017

    • Author(s)
      下浦 享
    • Journal Title

      ISOTOPE NEWS

      Volume: 749 Pages: 7-9

    • Related Report
      2016 Annual Research Report
  • [Journal Article] RIビームを用いたテトラ中性子研究2017

    • Author(s)
      下浦 享
    • Journal Title

      原子核研究

      Volume: 61 Pages: 70-77

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Presentation] High-resolution spectroscopy with SHARAQ and advice on HIHR2022

    • Author(s)
      Susumu Shimoura
    • Organizer
      Second International Workshop on the Extension Project for the J-PARC Hadron Experimental Facility
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Experiments on tetra-neutron resonance2022

    • Author(s)
      Susumu Shimoura
    • Organizer
      Developments of Physics of Unstable Nuclei (YKIS2022b)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] OEDO -- Slowing-Down Beam Line in RIKEN RIBF2022

    • Author(s)
      Susumu Shimoura
    • Organizer
      DREB22 - Direct Reactions with Exotic Beams
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] テトラ中性子と多体相関2022

    • Author(s)
      下浦 享
    • Organizer
      RCNP研究会「低エネルギー核物理と高エネルギー天文学で読み解く中性子星」
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Tetra-neutron system studied by RI-beam experiment2022

    • Author(s)
      Susumu Shimoura
    • Organizer
      The 15th Asia Pacific Physics Conference
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 非束縛少数多体系の物理2022

    • Author(s)
      下浦 享
    • Organizer
      市村宗武先生講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Direct Reactions as Quantum Probes of Nuclear System2020

    • Author(s)
      Susumu Shimoura
    • Organizer
      日本物理学会秋季大会 Joint Symbosium of JPS Nuclear Physics and Physical Review C
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Few-neutron systems2019

    • Author(s)
      Susumu Shimoura
    • Organizer
      Mini-workshop on "New aspects of few-nucleon systems and related topics"
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] OEDO project - Slowing-Down Beam Line in RIKEN RIBF2019

    • Author(s)
      Susumu Shimoura
    • Organizer
      XXIII Interantional School on Nuclear Physics (Varna 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Slowing-Down Beam Line at RIKEN RIBF -- OEDO2019

    • Author(s)
      Susumu Shimoura
    • Organizer
      14th Asia-Pacific Physics Conference 2019 (APPC14)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 二重荷電交換反応4He(8He,8Be)反応の再測定II2019

    • Author(s)
      S. Masuoka et al.
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Tetra-neutron and few-body correlations studied by RI-beam experiments2018

    • Author(s)
      S. Shimoura
    • Organizer
      New Frontiers in Nuclear Physics and Astrophysics, Antalya, Turkey
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetraneutron system populated by double-charge exchange reactions using RI beam2018

    • Author(s)
      S. Shimoura
    • Organizer
      The 13th International Conference on Hypernuclear and Strange Particle Physics (HYP2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system populated by RI-beam induced reactions2018

    • Author(s)
      S. Shimoura
    • Organizer
      The 22nd International Conference on Few-Body Problems in Physics (FB22)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Study of the "tetra-neutron" system via the 4He(8He,8Be) reaction2018

    • Author(s)
      S. Masuoka et al.
    • 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] Tetra-neutron system populated by nuclear reactions using RI-beam2018

    • Author(s)
      S. Shimoura
    • Organizer
      Multiparticle resonances in hadrons, nuclei, and ultracold gases
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system populated by exothermic double-charge exchange reaction2017

    • Author(s)
      下浦 享
    • Organizer
      基研研究会「核力に基づく核構造、核反応物理の展開」
    • Place of Presentation
      京都大学(京都府京都市)
    • Year and Date
      2017-03-27
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Tetra-neutron system populated by reaction of exotic beam2017

    • Author(s)
      S. Shimoura
    • Organizer
      ESNT Workshop on Dynamics of highly unstable exotic light nuclei and few-body systems
    • Place of Presentation
      Saclay (France)
    • Year and Date
      2017-01-30
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system studied by (8He,8Be) reaction2017

    • Author(s)
      S. Shimoura
    • Organizer
      GANIL Workshop on Nuclear Structure and Reaction Theories: Building Together for the Future
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system populated by RI-beam experiments2017

    • Author(s)
      S. Shimoura
    • Organizer
      Critical Stability of Quantum Few-Body Systems
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system populated by RI-beam induced reactions2017

    • Author(s)
      S. Shimoura
    • Organizer
      実験と観測で解き明かす中性子星の核物質
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Tetra-neutron system studied by 4He(8He,8Be)2016

    • Author(s)
      S. Shimoura
    • Organizer
      Workshop on Nuclear Cluster Physics (WNCP2016)
    • Place of Presentation
      関東学院大学(神奈川県横浜市)
    • Year and Date
      2016-11-14
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system studied by 4He(8He,8Be)2016

    • Author(s)
      S. Shimoura
    • Organizer
      ECT* Workshop on Physics beyond the limits of stability: exploring the continuum
    • Place of Presentation
      Trento (Italy)
    • Year and Date
      2016-10-17
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron system populated by exothermic double-charge exchange reaction 4He(8He,8Be) reaction at 190 MeV/u2016

    • Author(s)
      S. Shimoura
    • Organizer
      22nd International Spin Symposium
    • Place of Presentation
      Champaign, IL (USA)
    • Year and Date
      2016-09-25
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Charge Exchange Reaction of RI Beam to Populate Exotic States2016

    • Author(s)
      S. Shimoura
    • Organizer
      International Nuclear Physics Conference (INPC2016)
    • Place of Presentation
      Adelaide (Australia)
    • Year and Date
      2016-09-11
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Experimental studies of the tetra-neutron system by using RI-beam2016

    • Author(s)
      S. Shimoura
    • Organizer
      The 23rd European Conference on Few-Body Problems in Physics
    • Place of Presentation
      Aarhus (Denmark)
    • Year and Date
      2016-08-08
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tetra-neutron states populated by 4He(8He,8Be) reaction2016

    • Author(s)
      S. Shimoura
    • Organizer
      The 9th international conference on Direct Reactions with Exotic Beams (DREB2016)
    • Place of Presentation
      Halifax (Canada)
    • Year and Date
      2016-07-11
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Tetraneutron states populated via 4He(8He,8Be) reaction2016

    • Author(s)
      S. Shimoura
    • Organizer
      The 11th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (Cluster16)
    • Place of Presentation
      Naples (Italy)
    • Year and Date
      2016-05-23
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 4個の中性子だけでできた原子核を観測

    • URL

      https://www.riken.jp/press/2022/20220623_1/index.html

    • Related Report
      2020 Annual Research Report

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Published: 2016-04-21   Modified: 2024-01-30  

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