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2014 Fiscal Year Annual Research Report

元素合成過程におけるニュートリノ‐原子核反応および電子捕獲反応

Research Project

Project/Area Number 22540290
Research InstitutionNihon University

Principal Investigator

鈴木 俊夫  日本大学, 文理学部, 教授 (70139070)

Project Period (FY) 2010-04-01 – 2015-03-31
Keywords理論核物理 / 電子捕獲反応 / 殻模型 / ニュートリノ-原子核反応 / ベータ崩壊 / 核URCA過程 / 元素合成 / r-プロセス
Outline of Annual Research Achievements

原子核のスピンモードを正確に記述する新しい殻模型ハミルトニアンを用いて、電子捕獲率、ベータ崩壊率のより精密な評価を行い、星での元素合成や星の進化の過程に応用した。
(1)スピン応答を良く記述するfp-殻核の新しいハミルトニアン、GXPF1J、を用いて、高密度・高温の天体条件下での電子捕獲率、ベータ崩壊率の精密な評価を核領域を拡張して行い、従来の評価と有意な差があることを示した。Fe、Ni領域核の新しい弱遷移率が星のコア崩壊や超新星爆発過程の元素合成に与える影響を調べた。特に56Niにおける従来より低い電子捕獲率が58Ni等の中性子過剰核の生成率を下げ、これらの元素の過剰生成問題を解決できる可能性を指摘した。精密な電子捕獲率を求めることの重要性を示した。
(2)昨年度は、中性子数N=126のアイソトーンのベータ崩壊率をZ=74-78の領域まで拡張して求め、従来のFRDM模型より短い半減期を得たが、今回は鉄コア爆発型の超新星爆発過程におけるU、Th等のアクチナイド元素を含むr-過程元素合成の研究を行った。U、Th領域でのr-過程元素の合成率が上がり太陽系元素組成に近づくことを示した。これらの研究はr-過程元素合成のサイト(場所)がどこかを特定する上での基礎となる。
(3)昨年度の8-10太陽質量星に於ける核URCA過程によるO-Ne-Mgコアのクーリング効果の研究を発展させ白色矮星に応用した。Ia型超新星爆発のプロジェニーターとしてのハイブリッド型C-O-Ne白色矮星の進化に於ける核URCA過程によるクーリングの効果を調べ、その重要な役割を明らかにした。(1)と同様に、精密な電子捕獲率、ベータ崩壊率を求めることの重要性を示した。

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

  • Research Products

    (17 results)

All 2015 2014

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results,  Acknowledgement Compliant: 2 results) Presentation (12 results) (of which Invited: 8 results) Book (1 results)

  • [Journal Article] Hybrid C-O-Ne white dwarfs as progenitors of type Ia supernovae; dependence on Urca process and mixing assumptions2015

    • Author(s)
      P. A. Denissenkov, J. W. Truran, F. Herwig, S. Jones, B. Paxton, K. Nomoto, T. Suzuki, H. Toki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 447 Pages: 2696-2705

    • DOI

      10.1093/mnras/stu2589

    • Peer Reviewed / Open Access
  • [Journal Article] Mirror energy difference and the structure of loosely bound proton-rich nuclei around A=202014

    • Author(s)
      Cenxi Yuan, Chong Qi, Furong Xu, Toshio Suzuki, Takaharu Otsuka
    • Journal Title

      Physical Review C

      Volume: 89 Pages: 044327/1-7

    • DOI

      10.1103/PhysRevC.89.044327

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Neutron spectroscopic factors of 55Ni hole-states from (p, d) transfer reactions2014

    • Author(s)
      A. Sanetullaev, M. B. Tsang, W. G. Lynch, Jenny Lee, D. Bazin, K. P. Chan, D. Coupland, V. Henzl, D. Henzlova, M. Kilburn, A. M. Rogers, ... C. Barbieri, M. Hjorth-Jensen, M. Horoi, T. Otsuka, T. Suzuki, Y. Utsuno (全25名中24番目)
    • Journal Title

      Physics Letters B

      Volume: 736 Pages: 137-141

    • DOI

      10.1016/j.physletb.2014.07.003

    • Peer Reviewed / Open Access
  • [Journal Article] New neutrino-nucleus reaction cross sections at solar, reactor and supernova neutrino energies2014

    • Author(s)
      T. Suzuki, M. Honma, A. B. Balantekin, T. Kajino, S. Chiba
    • Journal Title

      EPJ Web of Conferences

      Volume: 66 Pages: 07025/1-8

    • DOI

      10.1051/epjconf/20146607025

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] Nuclear weak processes and nucleosynthesis2015

    • Author(s)
      Toshio Suzuki
    • Organizer
      Internationbal Workshop on “Neutrino Physics and Astrophysics”
    • Place of Presentation
      Mimar Sinan Fine Arts University, Istanbul, Turkey
    • Year and Date
      2015-03-16 – 2015-03-20
    • Invited
  • [Presentation] Nuclear weak rates at stellar environments and astrophysical applications2015

    • Author(s)
      Toshio Suzuki
    • Organizer
      Aizu mini-workshop on nuclear physics
    • Place of Presentation
      会津大学、会津若松
    • Year and Date
      2015-02-12 – 2015-02-13
    • Invited
  • [Presentation] Shell-model study of neutrino-nucleus reactions2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      Workshop on "Progress in nuclear shell-model calculations in CNS-RIKEN collaboration"
    • Place of Presentation
      RIKEN, Saitama, Japan,
    • Year and Date
      2014-11-28 – 2014-11-28
    • Invited
  • [Presentation] Electron-capture rates in fp-shell nuclei at stellar environments2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      Workshop on nuclear physics and astrophysics
    • Place of Presentation
      IPMU, Kashiwa, Japan
    • Year and Date
      2014-11-21 – 2014-11-21
    • Invited
  • [Presentation] Electron capture and beta-decay processes at stellar environments and nucleosynthesis2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      ISPUN2014 (The 4th International Symposium on Physics of Unstable Nuclei)
    • Place of Presentation
      Ho Chi Minh, Vietnam
    • Year and Date
      2014-11-03 – 2014-11-08
  • [Presentation] Nuclear structure for SNe r- and neutrino processes2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      Symposium on “Explosive Nucleosynthesis in SNe and XRB as Multi-messengers”, 日米合同物理学会
    • Place of Presentation
      Hawaii, USA
    • Year and Date
      2014-10-07 – 2014-10-10
    • Invited
  • [Presentation] Nuclear Shell Structure, Nuclear Forces and Nuclear Weak Processes2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      Computational Challenges in Nuclear and Many-Body Physics
    • Place of Presentation
      NORDITA, Stockholm, Sweden
    • Year and Date
      2014-09-22 – 2014-09-26
    • Invited
  • [Presentation] Spin Responses in Nuclei and Nuclear Weak Processes in Stars2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      NUBA Conference Series-1: Nuclear Physics and Astrophysics
    • Place of Presentation
      Antalya, Turkey
    • Year and Date
      2014-09-15 – 2014-09-21
    • Invited
  • [Presentation] Nuclear structure and nucleosynthesis2014

    • Author(s)
      Toshio Suzuki
    • Organizer
      ECT* Workshop on Nuclear Physics and Astrophysics of Neutron-Star Mergers and Supernovae, and the Origin of R-Process Elements
    • Place of Presentation
      Trento, Italy
    • Year and Date
      2014-09-08 – 2014-09-12
    • Invited
  • [Presentation] Electron capture rates for exotic nuclei at stellar environments2014

    • Author(s)
      T. Suzuki, M. Honma, T. Otsuka, T. Kajino
    • Organizer
      2nd Conference on Advances in Radioactive Isotope Science (ARIS2014)
    • Place of Presentation
      Univ. of Tokyo, Tokyo, Japan
    • Year and Date
      2014-06-01 – 2014-06-06
  • [Presentation] Beta-decay rates for exotic nuclei and r-process nucleosynthesis2014

    • Author(s)
      T. Suzuki, T. Yoshida, S. Wanajo, T. Kajino, T. Otsuka
    • Organizer
      2nd Conference on Advances in Radioactive Isotope Science (ARIS2014)
    • Place of Presentation
      Univ. of Tokyo, Tokyo, Japan
    • Year and Date
      2014-06-01 – 2014-06-06
  • [Presentation] Shell-model study of spin modes in nuclei and nuclear forces2014

    • Author(s)
      T. Suzuki, T. Otsuka, M. Honma, N. Tsunoda
    • Organizer
      11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure
    • Place of Presentation
      Ischia, Italy
    • Year and Date
      2014-05-12 – 2014-05-16
  • [Book] Exotic Nuclei IASEN2013 Proceedings of the First African Symposium on Exotic Nuclei2015

    • Author(s)
      T. Suzuki, T. Kajino, M. Honma, H. Toki, K. Nomoto
    • Total Pages
      610 (内11ページ)
    • Publisher
      World Scientific

URL: 

Published: 2016-06-01  

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