Low-energy monopole and dipole modes in light nuclei

• Project/Area Number: 18K03617
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Kyoto University
• Principal Investigator: Kanada-En'yo Yoshiko 京都大学, 理学研究科, 准教授 (40300678)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 中性子過剰核 / クラスター / 双極子励起 / クラスター構造 / α散乱 / 陽子散乱 / 不安定原子核 / モノポール遷移 / 非弾性散乱 / 不安定核

Outline of Final Research Achievements

I studied monopole and dipole excitations of stable and unstable nuclei in light mass region. The properties of low-energy excitation modes were investigated to　clarify excitation modes arising in many-nucleon systems. To describe exotic excitation modes at low energy, a new theoretical　method was constructed based on the framework of the anti-symmetrized molecular dynamics and were applied to neutron rich nuclei including Beryllium and Oxygen isotopes. The isospin properties of the dipole excitations were analyzed in detail to reveal the origins of those excitation modes. The clustering and valence neutrons were found to play important roles in excitation modes. The former and the latter contributes to the isoscalar and isovector components of the low-energy dipole excitations.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した新しい計算手法(構造モデル)によって、安定原子核、不安定原子核の励起モードを理論的に説明することに成功した。中性子過剰核における低エネルギーモードの実験データが増加する中で、その理論的な解明が必要とされている状況において、アイソスピン自由度に注目した解析によって、励起モードの特徴と発現メカニズムを明らかにしたことは重要な成果である。特に、クラスター構造、原子核変形、余剰中性子に起因した異なるタイプのモードの出現を示したことは独創的な成果である。さらに、予言した励起モードについて原子核反応計算による断面積の理論値を示したことは、新たな励起モード探索実験に直接結びつく成果である。

Research Products

• [Journal Article] Collective model for cluster motion in 8Be, 12C, and 16O systems based on microscopic 2α, 3α, and 4α models (2022)
  • Author(s): Kanada-En'yo Yoshiko、Hinohara Nobuo
  • Journal Title: Physical Review C Volume: 106 Issue: 5 Pages: 054312-054312
  • DOI: 10.1103/physrevc.106.054312
  • Peer Reviewed / Open Access
• [Journal Article] Neutron 3s1/2occupation change across the stable tin isotopes investigated using isotopic analysis of proton scattering at 295 MeV (2022)
  • Author(s): Kanada-En'yo Yoshiko
  • Journal Title: Physical Review C Volume: 106 Issue: 3 Pages: 034321-034321
  • DOI: 10.1103/physrevc.106.034321
  • Peer Reviewed / Open Access
• [Journal Article] Low-energy dipole excitations in 20O with antisymmetrized molecular dynamics (2021)
  • Author(s): Shikata Yuki、Kanada-En'yo Yoshiko
  • Journal Title: Physical Review C Volume: 104 Issue: 3 Pages: 034314-034314
  • DOI: 10.1103/physrevc.104.034314
  • Peer Reviewed
• [Journal Article] Investigation of multistep effects for proton inelastic scattering to the 2^+_1 state in 6He (2021)
  • Author(s): Ogawa Shoya、Matsumoto Takuma、Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 104 Issue: 4 Pages: 044608-044608
  • DOI: 10.1103/physrevc.104.044608
  • Peer Reviewed
• [Journal Article] Effective interactions between nuclear clusters (2021)
  • Author(s): Y.Kanada-En'yo and D.Lee}
  • Journal Title: Physical review C Volume: 103 Issue: 2 Pages: 024318-024318
  • DOI: 10.1103/physrevc.103.024318
  • Peer Reviewed
• [Journal Article] Low-energy dipole excitation mode in ^{18} 18 O with antisymmetrized molecular dynamics (2021)
  • Author(s): Yuki Shikata, Yoshiko Kanada-En'yo
  • Journal Title: Physical review C Volume: 103 Issue: 3 Pages: 034312-034312
  • DOI: 10.1103/physrevc.103.034312
  • Peer Reviewed
• [Journal Article] Lattice QCD study of static quark and antiquark correlations at finite T via entanglement entropies (2021)
  • Author(s): Takahashi Toru T.、Kanada-En’yo Yoshiko
  • Journal Title: Physical Review D Volume: 103 Issue: 3 Pages: 034504-034504
  • DOI: 10.1103/physrevd.103.034504
  • Peer Reviewed
• [Journal Article] Probing negative-parity states of Mg24 probed with proton and α inelastic scattering (2021)
  • Author(s): Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 103 Issue: 2 Pages: 024603-024603
  • DOI: 10.1103/physrevc.103.024603
  • Peer Reviewed
• [Journal Article] Neutron dominance in excited states of Mg26 and Be10 probed by proton and α inelastic scattering (2020)
  • Author(s): Kanada-En'yo Yoshiko、Shikata Yuki、Chiba Yohei、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 102 Issue: 1 Pages: 014607-014607
  • DOI: 10.1103/physrevc.102.014607
  • Peer Reviewed
• [Journal Article] Properties of Kπ=01+, Kπ=2?, and Kπ=01? bands of Ne20 probed via proton and α inelastic scattering (2020)
  • Author(s): Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 101 Issue: 6
  • DOI: 10.1103/physrevc.101.064308
  • Peer Reviewed
• [Journal Article] Variation after K-projection in antisymmetrized molecular dynamics for low-energy dipole excitations in 10Be and 16O (2020)
  • Author(s): Shikata Yuki、Kanada-En’yo Yoshiko
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2020 Issue: 7
  • DOI: 10.1093/ptep/ptaa092
  • Peer Reviewed
• [Journal Article] Transition properties of low-lying states in Si28 probed via inelastic proton and α scattering (2020)
  • Author(s): Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 101 Issue: 6
  • DOI: 10.1103/physrevc.101.064607
  • Peer Reviewed
• [Journal Article] Cluster structures and monopole transitions of C14 (2020)
  • Author(s): Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 101 Issue: 1 Pages: 014317-014317
  • DOI: 10.1103/physrevc.101.014317
  • Peer Reviewed
• [Journal Article] Tensor Correlations in alpha Clustering Studied with Antisymmetrized Quasi Cluster Model (2020)
  • Author(s): Kanada-En’yo Yoshiko、Matsuno Hideaki、Itagaki Naoyuki
  • Journal Title: Springer Proc.Phys. Volume: 238 Pages: 85-89
  • DOI: 10.1007/978-3-030-32357-8_15
  • ISBN: 9783030323561, 9783030323578
  • Peer Reviewed
• [Journal Article] Short-range and tensor correlations in $^{4}$He and $^{8}$Be studied with the antisymmetrized quasi-cluster model (2019)
  • Author(s): Itagaki N、Matsuno H、Kanada-En’yo Y
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2019 Issue: 6 Pages: 1-28
  • DOI: 10.1093/ptep/ptz046
  • Peer Reviewed / Open Access
• [Journal Article] Low-energy dipole excitation modes in 10Be (2019)
  • Author(s): Y. Shikata, Y. Kanada-En'yo and H. Morita
  • Journal Title: progress of theoretical and experimental phyiscs Volume: 2019 Issue: 6
  • DOI: 10.1093/ptep/ptz049
  • Peer Reviewed / Open Access
• [Journal Article] Microscopic calculation of inelastic proton scattering off O18,Be10,Be12, and C16 to study neutron excitation in neutron-rich nuclei (2019)
  • Author(s): Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 100 Issue: 6 Pages: 064616-064616
  • DOI: 10.1103/physrevc.100.064616
  • Peer Reviewed
• [Journal Article] First microscopic coupled-channels calculation of cross sections for inelastic α scattering off O16 (2019)
  • Author(s): Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 99 Issue: 6 Pages: 064608-064608
  • DOI: 10.1103/physrevc.99.064608
  • Peer Reviewed
• [Journal Article] Isoscalar dipole excitations in O16 (2019)
  • Author(s): Kanada-En'yo Yoshiko、Shikata Yuki
  • Journal Title: Physical Review C Volume: 100 Issue: 1 Pages: 014301-014301
  • DOI: 10.1103/physrevc.100.014301
  • Peer Reviewed
• [Journal Article] Quantitative description of the Ne20(p,pα)O16 reaction as a means of probing the surface α amplitude (2019)
  • Author(s): Yoshida Kazuki、Chiba Yohei、Kimura Masaaki、Taniguchi Yasutaka、Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 100 Issue: 4 Pages: 1-6
  • DOI: 10.1103/physrevc.100.044601
  • Peer Reviewed
• [Journal Article] Investigation of spatial manifestation of α clusters in 16O via α-transfer reactions (2019)
  • Author(s): Fukui Tokuro、Kanada-En'yo Yoshiko、Ogata Kazuyuki、Suhara Tadahiro、Taniguchi Yasutaka
  • Journal Title: Nuclear Physics A Volume: 983 Pages: 38-52
  • DOI: 10.1016/j.nuclphysa.2018.12.024
  • Peer Reviewed
• [Journal Article] Investigation of α clustering with knockout reactions (2018)
  • Author(s): Yoshida Kazuki、Ogata Kazuyuki、Kanada-En'yo Yoshiko
  • Journal Title: Physical Review C Volume: 98 Issue: 2
  • DOI: 10.1103/physrevc.98.024614
  • Peer Reviewed
• [Journal Article] Manifestation of α clustering in Be10 via α-knockout reaction (2018)
  • Author(s): Lyu Mengjiao、Yoshida Kazuki、Kanada-En'yo Yoshiko、Ogata Kazuyuki
  • Journal Title: Physical Review C Volume: 97 Issue: 4
  • DOI: 10.1103/physrevc.97.044612
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Low-energy Gamow-Teller transitions in deformed N=Z odd-odd nuclei (2018)
  • Author(s): Morita Hiroyuki、Kanada-En'yo Yoshiko
  • Journal Title: Physical Review C Volume: 98 Issue: 3 Pages: 034307-034307
  • DOI: 10.1103/physrevc.98.034307
  • Peer Reviewed
• [Journal Article] Tensor correlations in He4 and Be8 within an antisymmetrized quasicluster model (2018)
  • Author(s): Matsuno H.、Kanada-En'yo Y.、Itagaki N.
  • Journal Title: Physical Review C Volume: 98 Issue: 5 Pages: 054306-054306
  • DOI: 10.1103/physrevc.98.054306
  • Peer Reviewed
• [Journal Article] Coexistence of cluster and shell-model aspects in nuclear systems (2018)
  • Author(s): Kanada-En’yo Yoshiko、Horiuchi Hisashi
  • Journal Title: Frontiers of Physics Volume: 13 Issue: 6
  • DOI: 10.1007/s11467-018-0830-y
• [Presentation] Progress report on nuclear clustering (2023)
  • Author(s): 金田佳子
  • Organizer: 第８回クラスター階層領域研究会
• [Presentation] 陽子およびα非弾性散乱で探る原子核の励起状態 (2021)
  • Author(s): 金田佳子
  • Organizer: RCNP研究会「原子核における多様な共鳴現象とそれを探る反応機構
• [Presentation] alpha inelastic scattering cross sections on 12C with microscopic coupled-channel calculation (2019)
  • Author(s): Y. Kanada-En'yo
  • Organizer: the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15)
  • Int'l Joint Research
• [Presentation] Cluster excited states probed by alpha and proton inelastic scattering (2019)
  • Author(s): Y. Kanada-En'yo
  • Organizer: ECT* Workshop on“ Light clusters in nuclei and nuclear matter: Nuclear structure and decay, heavy-ion collisions, and astrophysics
  • Int'l Joint Research
• [Presentation] alpha and di-nucleon correlations in nuclei (2019)
  • Author(s): Y. Kanada-En'yo
  • Organizer: ECT* workshop on Universal physics in Many-Body Quantum Systems From Atoms to Quarks
  • Int'l Joint Research / Invited
• [Presentation] Cluster phenomena in nuclear systems (2019)
  • Author(s): Yoshiko Kanada-En'yo
  • Organizer: 新学術領域研究「量子クラスターで読み解く物質の階層構造」スクール
  • Invited
• [Presentation] 4Heおよび8Beにおけるテンソル相関と短距離相関 (2019)
  • Author(s): 延与佳子
  • Organizer: 日本物理学会第74回年次大会（2019年）
• [Presentation] Tensor correlations in $\alpha$ clustering studied with antisymmetrized quasi cluster model' (2018)
  • Author(s): Yoshiko Kanada-En'yo
  • Organizer: International Conference on Few-Body Problems in Physics (FB22)
  • Int'l Joint Research
• [Presentation] Dipole excitations in 10Be (2018)
  • Author(s): Yoshiko Kanada-En'yo
  • Organizer: International Conference on Simplicity, Symmetry and Beauty of Atomic Nuclei
  • Int'l Joint Research
• [Presentation] Tensor correlation in $\alpha$ clustering studied with antisymmetrized quasi cluster model (AQCM): 4He and 8Be (2018)
  • Author(s): Yoshiko Kanada-En'yo
  • Organizer: Recent advances in nuclear structure physics 2018 (RANSP2018)
  • Int'l Joint Research