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Microscopic and systematic description of the spin-isospin responses of heavy neutron-rich nuclei in density-functional theory

Research Project

Project/Area Number 16K17687
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKyoto University (2017-2018)
Niigata University (2016)

Principal Investigator

Yoshida Kenichi  京都大学, 理学研究科, 助教 (00567547)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords中性子過剰核 / スピン・アイソスピン応答 / 密度汎関数理論 / ベータ崩壊 / 魔法数 / 原子核密度汎関数法 / 荷電交換 / 集団運動 / 巨大共鳴 / 集団振動 / ガンマ振動 / 理論核物理 / 密度汎関数法 / 不安定核 / 計算物理
Outline of Final Research Achievements

A systematic investigation on the spin-isospin responses in neutron-rich nuclei have been made. Nuclear energy-density functional method, a microscopic quantum many-body theory in terms of the nucleonic degree of freedom, was applied. Due to the imbalance of the chemical potentials of neutrons and protons, the negative-parity modes are expected to occur in low energy. The microscopic calculation revealed the unique roles of the superfluidity on the appearance of low-lying dipole modes and predicted the occurrence of the analog of the pygmy dipole mode.

Academic Significance and Societal Importance of the Research Achievements

中性子過剰核における新しいタイプの集団運動の発現可能性は,原子核物理学における重要なテーマの一つである。本研究では,これまで研究が進んでいなかった中性子過剰核のスピン・アイソスピン応答を微視的な理論枠組みを用いて調べることで,新しい励起モードを予言することができた。これらのモードはベータ崩壊にも影響を与える可能性が高く,重元素の起源とされるrプロセス元素合成過程のより深い理解にも貢献できる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (33 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (4 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 3 results,  Acknowledgement Compliant: 1 results) Presentation (22 results) (of which Int'l Joint Research: 11 results,  Invited: 9 results)

  • [Int'l Joint Research] INFN, Sezione di Catania(イタリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] University of the Witwatersrand(南アフリカ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] University of Notre Dame(米国)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research] Beihang University(中国)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Ab-initio description of excited states of 1D uniform matter with the Hohenberg-Kohn-theorem-inspired functional-renormalization-group method2019

    • Author(s)
      Yokota Takeru、Yoshida Kenichi、Kunihiro Teiji
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2019 Issue: 1

    • DOI

      10.1093/ptep/pty139

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Functional renormalization-group calculation of the equation of state of one-dimensional uniform matter inspired by the Hohenberg-Kohn theorem2019

    • Author(s)
      Yokota Takeru、Yoshida Kenichi、Kunihiro Teiji
    • Journal Title

      Physical Review C

      Volume: 99 Issue: 2 Pages: 024302-024302

    • DOI

      10.1103/physrevc.99.024302

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Charge-exchange dipole excitations in neutron-rich nuclei: -1 hbar omega_0, anti-analog pygmy and anti-analog giant resonances2017

    • Author(s)
      Kenichi Yoshida
    • Journal Title

      Physical Review C

      Volume: 96 Issue: 5

    • DOI

      10.1103/physrevc.96.051302

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 変形原子核の巨大単極共鳴2017

    • Author(s)
      吉田賢市,伊藤正俊
    • Journal Title

      日本物理学会誌

      Volume: 72 Pages: 45-49

    • NAID

      130006288044

    • Related Report
      2016 Research-status Report
  • [Journal Article] Enhanced collectivity of gamma vibration in neutron-rich Dy isotopes with N=108 - 1102016

    • Author(s)
      Kenichi Yoshida and Hiroshi Watanabe
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2016 Issue: 12 Pages: 123D02-123D02

    • DOI

      10.1093/ptep/ptw173

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Long-lived K isomer and enhanced gamma vibration in the neutron-rich nucleus Dy-172: Collectivity beyond double midshell2016

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

      Physics Letters B

      Volume: 760 Pages: 641-646

    • DOI

      10.1016/j.physletb.2016.07.057

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of ground-state deformation on isoscalar giant resonances in 28Si2016

    • Author(s)
      T. Peach, T. Murakam et al.
    • Journal Title

      Physical Review C

      Volume: 93 Issue: 6 Pages: 64325-64325

    • DOI

      10.1103/physrevc.93.064325

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Nuclear density-functional theory for weak matrix elements2019

    • Author(s)
      吉田賢市
    • Organizer
      KEK研究会「ニュートリノ原子核反応とニュートリノ相互作用」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] ベータ崩壊率から探る核構造: 78Ni におけるN=50の魔法数と殻構造2019

    • Author(s)
      吉田賢市
    • Organizer
      宇宙核物理連絡協議会研究会「核データと重元素合成を中心とする宇宙核物理研究会」
    • Related Report
      2018 Annual Research Report
  • [Presentation] Magic numbers, shell structures and collective phenomena2019

    • Author(s)
      Yoshida Kenichi
    • Organizer
      日本物理学会 第74回年次大会,シンポジウム「Nuclear structure studies through the magic numbers」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Analog pygmy-dipole resonance and low-lying charge-exchange dipole state in neutron-rich nuclei2018

    • Author(s)
      Yoshida Kenichi
    • Organizer
      The 6th International Conference on Collective Motion in Nuclei under Extreme Conditions
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Beta-decay around 78Ni: N=50 magic number and shell structure2018

    • Author(s)
      Yoshida Kenichi
    • Organizer
      YITP workshop on `Recent advances in nuclear structure physics 2018'
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Toward a systematic and microscopic calculation of beta-decay rates2018

    • Author(s)
      吉田賢市
    • Organizer
      理研研究会「重力波観測時代のrプロセスと不安定核」
    • Related Report
      2018 Annual Research Report
  • [Presentation] First-Forbidden Beta-decay near the Drip Line2018

    • Author(s)
      Yoshida Kenichi
    • Organizer
      The 4th workshop on many-body correlations in microscopic nuclear model
    • Related Report
      2018 Annual Research Report
  • [Presentation] Charge-exchange dipole excitations in deformed nuclei2017

    • Author(s)
      吉田賢市
    • Organizer
      日本物理学会 第72回年次大会
    • Place of Presentation
      大阪大学(大阪府,豊中市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Variety of excitation modes associated with nuclear deformation and superfluidity2017

    • Author(s)
      吉田賢市
    • Organizer
      クラスター・平均場の両側面からみる原子核構造の多様性とそのダイナミクス
    • Place of Presentation
      大阪市立大学(大阪府,大阪市)
    • Year and Date
      2017-01-19
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Spin-isospin responses in low-energy: roles of many-body correlations2017

    • Author(s)
      Kenichi Yoshida
    • Organizer
      Interdisciplinary symposium on modern density functional theory - iDFT
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Low-lying charge-exchange modes of excitation relevant to beta decay2017

    • Author(s)
      Kenichi Yoshida
    • Organizer
      China-Japan collaboration workshop on ‘Nuclear mass and life for unravelling mysteries of r-process’
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] First-forbidden vector modes in neutron-rich nuclei2017

    • Author(s)
      Kenichi Yoshida
    • Organizer
      3rd workshop on many-body correlations in microscopic nuclear model
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nuclear density-functional theory for collective modes of excitation2017

    • Author(s)
      Kenichi Yoshida
    • Organizer
      YITP school ‘Recent Progress of Nuclear Structure and Reaction Physics’
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 多体相関と外場で誘起される集団運動2017

    • Author(s)
      吉田賢市
    • Organizer
      RIBF 理論若手放談会: エキゾチック核物理の広がり
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 中性子過剰核における低励起荷電変化双極励起モード2017

    • Author(s)
      吉田賢市
    • Organizer
      日本物理学会 2017 年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Roles of neutron excess and deformation on charge-exchange collective modes of excitation2016

    • Author(s)
      Kenichi Yoshida
    • Organizer
      Recent Progresses in Nuclear Structure Physics 2016
    • Place of Presentation
      京都大学(京都府,京都市)
    • Year and Date
      2016-12-19
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Low-lying excitations in neutron-rich nuclei: Effects of deformation and pairing2016

    • Author(s)
      Kenichi Yoshida
    • Organizer
      The First Tsukuba-CCS-RIKEN joint workshop on 'Microscopic theories of nuclear structure and dynamics'
    • Place of Presentation
      理化学研究所(埼玉県,和光市)
    • Year and Date
      2016-12-12
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Deformation effect on giant resonances in 24Mg and 28Si2016

    • Author(s)
      吉田賢市
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      宮崎大学(宮崎県,宮崎市)
    • Year and Date
      2016-09-21
    • Related Report
      2016 Research-status Report
  • [Presentation] はじめに2016

    • Author(s)
      吉田賢市
    • Organizer
      日本物理学会 2016年秋季大会シンポジウム「原子核の応答から探る多体相関」
    • Place of Presentation
      宮崎大学(宮崎県,宮崎市)
    • Year and Date
      2016-09-21
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Spin-isospin Responses of Deformed Neutron-rich Nuclei2016

    • Author(s)
      Kenichi Yoshida
    • Organizer
      26th International Nuclear Physics Conference
    • Place of Presentation
      Adelaide, Australia
    • Year and Date
      2016-09-11
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Skyrme-QRPA for vibrational modes in deformed nuclei2016

    • Author(s)
      Kenichi Yoshida
    • Organizer
      2nd workshop on many-body correlations in microscopic nuclear model
    • Place of Presentation
      尖閣荘(新潟県,佐渡市)
    • Year and Date
      2016-08-21
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Enhanced Collectivity of Gamma Vibration in Neutron-rich Dy Isotopes with N=108-1102016

    • Author(s)
      Kenichi Yoshida
    • Organizer
      Nuclear Structure 2016
    • Place of Presentation
      Knoxville, Tennessee, USA
    • Year and Date
      2016-07-24
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2022-02-16  

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