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Study of elementary excitations in the nucleon pair condensation using the recoilless nuclear reaction

Research Project

Project/Area Number 20H01928
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionKyoto University (2021-2023)
The University of Tokyo (2020)

Principal Investigator

Masanori Dozono  京都大学, 理学研究科, 助教 (60616259)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2021: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords対相関 / 対振動 / 対凝縮 / 核子対移行反応
Outline of Research at the Start

自然界に存在する豊かな物質は、多様な「相」により生み出されており、その発現機構を探るのは物質科学の重要な目的の一つである。このような例のうち、原子核の核子対凝縮では、発現すれば現れるはずの2 種類の素励起モードのうち、1 つが実験的に確立していないという根本的な問題を抱えている。本研究の目的は、核子対凝縮のヒッグスモードとして考えられている対振動の存在を実験的に確定することである。このために、対振動の最高感度測定を可能とする「無反跳反応」を用いる。本研究課題で開発するビーム制御法を、既存の装置と組み合わせることで、これまで不可能であった無反跳反応の測定を実現させる。

Outline of Final Research Achievements

A new method, the (α,6He) reaction, has been established to study pair vibration in nuclei, which is a key to understand the mechanism of nucleon pair condensation. The first proof-of-principle experiment has demonstrated that the (α,6He) reaction is quite an efficient probe to pair vibration components. Systematic studies of pair vibrations in superfluid nuclei are now feasible with the experimental method established in this work.

Academic Significance and Societal Importance of the Research Achievements

本研究で確立した手法により、原子核の対振動の実態が明らかになれば、核子対凝縮のヒッグスモードに関する議論が初めてできるようになり、凝縮の発現機構の理解が一歩進む。さらに、そこから核子対凝縮の性質も定量化できる可能性があり、理論モデルの精緻化を促すと予想され、例えば中性子星の内部構造の理解にもつながる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (8 results)

All 2023 2022 2021 2020

All Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 6 results)

  • [Presentation] Measurement of highly-excited neutron-pair vibration2023

    • Author(s)
      Masanori Dozono
    • Organizer
      RCNP Workshop "Microscopic approach from pair correlation to pair condensation"
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Parity-transfer reaction for study of spin-dipole 0- mode2023

    • Author(s)
      堂園昌伯
    • Organizer
      RCNP研究会「原子核におけるスピン自由度の織り成すダイナミクス」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Experimental studies of pairing correlation/vibration2023

    • Author(s)
      Masanori Dozono
    • Organizer
      JSPS/NRF/NSFC A3 Foresight Program "Nuclear Physics in the 21st Century"
    • Related Report
      2022 Annual Research Report
  • [Presentation] Searching for highly-excited pair vibration modes in tin isotopes using alpha-induced pair-transfer reactions2022

    • Author(s)
      Masanori Dozono
    • Organizer
      YIPQS long-term workshop "Mean-field and Cluster Dynamics in Nuclear Systems 2022 (MCD2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 核子対移行反応で探る対凝縮相の素励起モード2022

    • Author(s)
      堂園昌伯
    • Organizer
      RCNP研究会「原子核反応研究の最近の話題と展望」
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] (alpha,6He)反応を用いたヒッグス応答の研究2022

    • Author(s)
      堂園昌伯
    • Organizer
      RCNP研究会「微視的系と巨視的系における核子対凝縮相」
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] (4He,6He)反応による錫同位体の対振動状態の研究2021

    • Author(s)
      堂園昌伯
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Probing exotic structures of highly excited nuclei: OEDO-SHARAQ activities2020

    • Author(s)
      M. Dozono
    • Organizer
      RIBF Users Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2025-01-30  

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