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Pairing dynamics in inner crust of neutron stars and neutron-rich nuclei

Research Project

Project/Area Number 17K05436
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionNiigata University

Principal Investigator

Matsuo Masayuki  新潟大学, 自然科学系, 教授 (70212214)

Co-Investigator(Kenkyū-buntansha) 関澤 一之  新潟大学, 研究推進機構, 特任助教 (00820854)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords中性子星内殻 / 中性子超流体 / 中性子過剰核 / 集団励起 / 対相関 / 中性子過剰原子核 / Anderson-Bogoliubovモード / 近接効果 / 集団運動 / 密度汎関数理論 / 超流体音波 / 中性子星
Outline of Final Research Achievements

The inner crust of neutron stars is a unique matter consisting of neutron-rich nuclei and neutron superfluid. We have studied theoretically the pairing correlation and low-lying collective excitations of the inner crust matter by means of the nuclear density functional theory. It is found that the coupling between the superfluid phonon, an elementary mode of excitation in neutron superfluid, and the collective modes of nuclei (the displacement and the surface vibration) may be weak. We also studied the role of the pairing correlation in forming the neutron quasiparticle resonance, and revealed its novel features.

Academic Significance and Societal Importance of the Research Achievements

本研究の主要な結論は、中性子星内殻における2つの素励起モード、中性子超流体の音波と原子核の集団運動の間の結合が弱い可能性を理論的に指摘したことである。このモード間結合が弱い場合、内殻物質の熱伝導率が大きくなることが推定され、中性子星内殻の熱伝導が関与する現象を理解する上で新たな視点を与える可能性がある。また、本研究は、内殻中では原子核と中性子の散乱が対相関によって大きく影響を受けることも指摘するものである。これらは、中性子星内殻における中性子対相関の役割がこれまで認識されていた以上に広範であり、さらなる研究の必要性を示すものである。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (29 results)

All 2020 2019 2018 2017

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (24 results) (of which Int'l Joint Research: 13 results,  Invited: 6 results) Funded Workshop (1 results)

  • [Journal Article] s-wave quasiparticle resonance in neutron-rich drip-line nuclei2020

    • Author(s)
      Yoshihiko Kobayashi, Masayuki Matsuo
    • Journal Title

      Prog. Theor. Exp. Phys.

      Volume: 2020 Issue: 1

    • DOI

      10.1093/ptep/ptz136

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Proximity Effect of Pair Correlation in the Inner Crust of Neutron Stars with Hartree-Fock-Bogoliubov Theory2020

    • Author(s)
      Toshiyuki Okihashi, Masayuki Matsuo
    • Journal Title

      JPS Conf. Proc.

      Volume: 31 Pages: 11024-11024

    • DOI

      10.7566/jpscp.31.011024

    • NAID

      130008146832

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Coexistence of Anderson-Bogoliubov phonon and quadrupole cluster vibration in the inner crust of neutron stars2019

    • Author(s)
      T. Inakura, M. Matsuo
    • Journal Title

      Physical Review C

      Volume: 99 Issue: 4 Pages: 45801-45801

    • DOI

      10.1103/physrevc.99.045801

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anderson-Bogoliubov phonons in the inner crust of neutron stars: Dipole excitation in a spherical Wigner-Seitz cell2017

    • Author(s)
      Tsunenori Inakura and Masayuki Matsuo
    • Journal Title

      Physical Review C

      Volume: 96

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 連続状態乱雑位相近似による励起状態間遷移への相関効果:ソフト双極子と四重極振動状態間の遷移に関して2020

    • Author(s)
      斉藤照之、松尾正之
    • Organizer
      日本物理学会第75回年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 現実的なペアギャップを考慮した中性子星内殻における近接効果2020

    • Author(s)
      起橋俊之、松尾正之
    • Organizer
      日本物理学会第75回年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 密度汎関数理論でr過程中性子捕獲過程を記述する2019

    • Author(s)
      松尾正之
    • Organizer
      基研研究会「原子核物理でつむぐrプロセス」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 連続状態RPA理論による直接中性子捕獲過程反応の記述:励起状態間遷移の記述2019

    • Author(s)
      斉藤照之、松尾正之
    • Organizer
      基研研究会「原子核物理でつむぐrプロセス」
    • Related Report
      2019 Annual Research Report
  • [Presentation] Proximity effect of pair correlation in the inner crust of neutron stars with Hartree-Fock-Bogoliubov theory2019

    • Author(s)
      T. Okihashi, M. Matsuo
    • Organizer
      The 15th International Symposium on Origin of Matter and Evolution of Galaxies
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Self-consistent band calculations for nuclear slabs with Skyrme energy density functionals2019

    • Author(s)
      S. Kobayashi, K. Sekizawa, M. Matsuo
    • Organizer
      The 5th workshop on many-body correlations in microscopic nuclear models
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Proximity effects in the inner crust of neutron stars using Hartree-Fock-Bogoliubov theory2019

    • Author(s)
      T. Okihashi, M. Matsuo
    • Organizer
      The 5th workshop on many-body correlations in microscopic nuclear models
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A fully self-consistent QRPA calculation with BCPM functional for Ni isotopes2019

    • Author(s)
      R. Okabe, M. Matsuo
    • Organizer
      The 5th workshop on many-body correlations in microscopic nuclear models
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Transition between collective states in the framework of continuum RPA2019

    • Author(s)
      T. Saito, M. Matsuo
    • Organizer
      The 5th workshop on many-body correlations in microscopic nuclear models
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] s-wave quasiparticle resonance in neutron-rich drip-line nuclei2019

    • Author(s)
      Y. Kobayashi, M. Matsuo
    • Organizer
      The 5th workshop on many-body correlations in microscopic nuclear models
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Transition between excited states within continuum RPA: toward microscopic description of direct neutron capture2019

    • Author(s)
      T. Saito, M. Matsuo
    • Organizer
      The international workshop on nuclear physics for astrophysical phenomena
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Anderson-Bogoliubov mode in inner crust of neutron star2019

    • Author(s)
      T. Inakura, M. Matsuo
    • Organizer
      The international workshop on nuclear physics for astrophysical phenomena
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 中性子内殻物質における集団運動:原子核クラスターの4重極モード2019

    • Author(s)
      稲倉恒法、松尾正之
    • Organizer
      日本物理学会第74回年会 九州大学
    • Related Report
      2018 Research-status Report
  • [Presentation] Hartree-Fock-Bogoliubov理論を用いた中性子星内殻における対相関の近接効果2019

    • Author(s)
      起橋俊之、松尾正之
    • Organizer
      日本物理学会第74回年会 九州大学
    • Related Report
      2018 Research-status Report
  • [Presentation] 低エネルギーs波散乱がうける対相関効果のS行列による分析III2019

    • Author(s)
      小林良彦、松尾正之
    • Organizer
      日本物理学会第74回年会 九州大学
    • Related Report
      2018 Research-status Report
  • [Presentation] Pair correlation and collectivity in neutron-rich nuclear systems2018

    • Author(s)
      松尾正之
    • Organizer
      20th Northeastern Asia Symposium 2018 on Nuclear Physics in the 21st Century
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Coexistence of Anderson-Bogoliubov Phonon and Cluster Quadrupole Vibration in Neutron Star Inner Crust2018

    • Author(s)
      稲倉恒法、松尾正之
    • Organizer
      Recent Advances in Nuclear Structure Physics 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Quadrupole excitations in inner crust of neutron stars2018

    • Author(s)
      松尾正之
    • Organizer
      The 4th workshop on many-body correlations in microscopic nuclear models
    • Related Report
      2018 Research-status Report
  • [Presentation] Neutron pairing from drip-line to neutron star inner crust2018

    • Author(s)
      松尾正之
    • Organizer
      The 50th Reimei workshop "Universal Physics in Many-Body Quantum Systems --- from Atoms to Quarks ---
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 超流動原子核における低エネルギー波散乱のS行列による分析2018

    • Author(s)
      小林良彦、松尾正之
    • Organizer
      基研研究会「Threshold Rule 50」
    • Related Report
      2018 Research-status Report
  • [Presentation] Coexitence of Anderson-Bogoliubov phonon and cluster quadrupole vibration in neutron star inner crust2018

    • Author(s)
      稲倉恒法、松尾正之
    • Organizer
      Tsukuba-CCS workshop on ``microscopic theories of nuclear structure and dynamcs
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 中性子星内殻における超流動中性子と原子核の集団運動:双極モードと四重極モード2018

    • Author(s)
      稲倉恒法、松尾正之
    • Organizer
      新学術領域「実験と観測で解き明かす中性子星の核物質」理論班主催研究会「中性子星核物質」2018
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Anderson-Bogoliubov phonon in inner crust of neutron star2017

    • Author(s)
      Tsunenori Inakura, Masayuki Matsuo
    • Organizer
      Interdisciplinary symposium on modern density functional theory (iDFT)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 中性子星内殻における超流動中性子と原子核の集団運動2017

    • Author(s)
      稲倉恒法、松尾正之
    • Organizer
      新学術領域「実験と観測で解き明かす中性子星の核物質」第6回「中性子星の核物質」研究会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Funded Workshop] The 5th workshop on many-body correlations in microscopic nuclear models2019

    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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