Investigation of the stabilization mechanism of cluster structures owing to excess neutrons

• Project/Area Number: 15K17662
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Matsue National College of Technology
• Principal Investigator: Tadahiro Suhara 松江工業高等専門学校, 数理科学科, 講師 (10708407)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 核構造 / クラスター構造 / 分子動力学 / 現実的核力 / 中性子過剰核

Outline of Final Research Achievements

In the previous work, we predicted the existence of the linear-chain structure in 14C, which is a typical example of the exotic cluster structures stabilized by excess neutrons. We confirmed the existence of this structure by the collaboration studies with experimental groups. We studied methods for demonstrating the structure through reactions and showed that α transfer reactions are useful to investigate the spatial distribution of the α cluster. We developed and improved theoretical models for studying nuclear structure using realistic nuclear forces, and confirmed those are effective.

Academic Significance and Societal Importance of the Research Achievements

余剰中性子によって安定化するクラスター構造が実証されたことは重要な学術的意義を持つ。特にそれが半世紀以上に渡って研究されてきたリニアチェイン構造であったことは原子核物理分野へのインパクトは大きかったと評価できる。我々の研究によって発展した様々な理論模型や実験データと構造の情報を結びつけるための手法は、今後原子核構造の理解を進展させていく上で、非常に有用である。特にαクラスター構造の空間的な発達の程度がα移行反応の断面積から直接理解できる可能性を示したことは、クラスター構造研究で得た知見を実証するための方法を新たに与えたと評価できる。

Research Products

• [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] Effect of channel coupling on the elastic scattering of lithium isotopes (2018)
  • Author(s): T. Furumoto, T. Suhara, and N. Itagaki
  • Journal Title: Physical Reviw C Volume: 97 Issue: 4 Pages: 044602-044602
  • DOI: 10.1103/physrevc.97.044602
  • Peer Reviewed
• [Journal Article] Tensor-optimized high-momentum antisymmetrized molecular dynamics with a bare interaction, and its application to the He4 nucleus (2018)
  • Author(s): Lyu Mengjiao、Myo Takayuki、Isaka Masahiro、Toki Hiroshi、Ikeda Kiyomi、Horiuchi Hisashi、Suhara Tadahiro、Yamada Taiichi
  • Journal Title: Physical Review C Volume: 98 Issue: 6 Pages: 064002-064002
  • DOI: 10.1103/physrevc.98.064002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hybridization of tensor-optimized and high-momentum antisymmetrized molecular dynamics for light nuclei with bare interaction (2018)
  • Author(s): Mengjiao Lyu, Masahiro Isaka, Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, Tadahiro Suhara, and TaiichiYamada
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 2018, 011D01 Issue: 1 Pages: 1-9
  • DOI: 10.1093/ptep/ptx192
  • NAID: 130007647367
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Successive variational method of the tensor-optimized antisymmetrized molecular dynamics for central interaction in finite nuclei (2017)
  • Author(s): Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, and Tadahiro Suhara
  • Journal Title: Physics Review C Volume: 95 Issue: 4 Pages: 044314-044314
  • DOI: 10.1103/physrevc.95.044314
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] New successive variational method of tensor-optimized antisymmetrized molecular dynamics for nuclear many-body system (2017)
  • Author(s): Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, and Tadahiro Suhara
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2017 Issue: 7 Pages: 1-23
  • DOI: 10.1093/ptep/ptx089
  • Peer Reviewed / Open Access
• [Journal Article] Power series expansion method in tensor{optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method (2017)
  • Author(s): Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, and Tadahiro Suhara
  • Journal Title: Physical Review C Volume: 96 Issue: 3 Pages: 1-6
  • DOI: 10.1103/physrevc.96.034309
  • Peer Reviewed
• [Journal Article] High-momentum antisymmetrized moleculardynamics compared with tensor-optimized shell model for strong tensor correlation (2017)
  • Author(s): Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, Tadahiro Suhara, Mengjiao Lyu, Masahiro Isaka, and Taiichi Yamada
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2017 Issue: 11 Pages: 1-10
  • DOI: 10.1093/ptep/ptx143
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Experimental investigation of linear-chain structured nucleus in 14C (2017)
  • Author(s): H. Yamaguchi, D. Kahl, S. Hayakawa, Y. Sakaguchi, K. Abe, T. Nakao, T. Suhara, N. Iwasa, A. Kim, D.H. Kim, et al.
  • Journal Title: Phys. Lett. B Volume: 766 Pages: 11-16
  • DOI: 10.1016/j.physletb.2016.12.050
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Tensor-optimized antisymmetrized molecular dynamics as a successive variational method in nuclear many-body system (2017)
  • Author(s): Takayuki Myo, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, and Tadahiro Suhara
  • Journal Title: Physics Letters B Volume: 769 Pages: 213-218
  • DOI: 10.1016/j.physletb.2017.03.059
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] General transformation of alpha cluster model wave function to jj-coupling shell model in various 4N nuclei (2016)
  • Author(s): N. Itagaki, H. Matsuno, and T. Suhara
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2016 Issue: 9 Pages: 093D01-093D01
  • DOI: 10.1093/ptep/ptw125
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei (2016)
  • Author(s): M.Kimura, T.Suhara, Y.Kanada-Enyo
  • Journal Title: European Physical Journal Volume: A52 Issue: 12 Pages: 373-410
  • DOI: 10.1140/epja/i2016-16373-9
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] One-dimensionality in atomic nuclei: A candidate for linear-chain α clustering in 14C (2016)
  • Author(s): A. Fritsch, S. Beceiro-Novo, D. Suzuki, W. Mittig, J. J. Kolata, T. Ahn, D. Bazin, F. D. Becchetti, B. Bucher, Z. Chajecki, X. Fang, M. Febbraro, A. M. Howard, Y. Kanada-En'yo, W. G. Lynch, A. J. Mitchell, M. Ojaruega, A. M. Rogers, A. Shore, T. Suhara, X. D. Tang, R. Torres-Isea, and H. Wang
  • Journal Title: Phys. Rev. C Volume: 93 Issue: 1
  • DOI: 10.1103/physrevc.93.014321
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Probing surface distributions of alpha clusters in 20Ne via alpha-transfer reaction (2016)
  • Author(s): Tokuro Fukui, Yasutaka Taniguchi, Tadahiro Suhara, Yoshiko Kanada-En'yo, and Kazuyuki Ogata
  • Journal Title: Physical Review C Volume: 93 Issue: 3 Pages: 034606-034606
  • DOI: 10.1103/physrevc.93.034606
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 10Be原子核の非弾性散乱断面積の計算とその励起状態の大きさについて (2019)
  • Author(s): 古本猛憲, 須原唯広, 板垣直之
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Linear-chain and gas-like structures in nuclei near 12C (2018)
  • Author(s): Tadahiro Suhara
  • Organizer: Fourth International Workshop on “State of the Art in Nuclear Cluster Physics”(SOTANCP4)
  • Int'l Joint Research
• [Presentation] Tensor-optimized antisymmetrized molecular dynamics with bare forces for light nuclei (2018)
  • Author(s): Takayuki Myo, Mengjiao Lyu, Hiroshi Toki, Kiyomi Ikeda, Hisashi Horiuchi, Tadahiro Suhara, Masahiro Isaka, Taiichi Yamada
  • Organizer: Fourth International Workshop on “State of the Art in Nuclear Cluster Physics”(SOTANCP4)
  • Int'l Joint Research
• [Presentation] Reduction of channel coupling effect on Li isotope elastic scatterings by glue-like behaviour of excess neutron (2018)
  • Author(s): Takenori Furumoto, Tadahiro Suhara, Naoyuki Itagaki
  • Organizer: Fourth International Workshop on “State of the Art in Nuclear Cluster Physics”(SOTANCP4)
  • Int'l Joint Research
• [Presentation] New variational method of tensor-optimized antisymmetrized molecular dynamics with bare nuclear force (2018)
  • Author(s): Takayuki Myo, Mengjiao Lyu, Masahiro Isaka, Hiroshi Toki, Hisashi Horiuchi, Kiyomi Ikeda, Tadahiro Suhara, Taiichi Yamada
  • Organizer: 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
  • Int'l Joint Research
• [Presentation] クラスター構造とクラスターの壊れ (2018)
  • Author(s): 須原唯広
  • Organizer: 市大ワークショップ「原子核のダイナミクスの現状と展望」 ～Highlights and Outlooks on Dynamics of Atomic Nuclei～
  • Invited
• [Presentation] クラスター・シェル競合によるクラスター構造の変化 (2017)
  • Author(s): 須原 唯広
  • Organizer: 研究会「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
  • Year and Date: 2017-01-19
• [Presentation] Linear-chain and gas-like structures in nuclei near 12C (2017)
  • Author(s): Tadahiro Suhara
  • Organizer: Workshop on Nuclear Cluster Physics (WNCP2017)
  • Int'l Joint Research / Invited
• [Presentation] 凝縮状態における平均場の変形とクラスターの変形 (2017)
  • Author(s): 須原唯広
  • Organizer: RIBF理論若手放談会：エキゾチック核物理の広がり
  • Invited
• [Presentation] 炭素周辺核のクラスター構造 (2017)
  • Author(s): 須原唯広
  • Organizer: RCNP研究会「核子・ストレンジネス多体系におけるクラスター現象」
  • Invited
• [Presentation] α-cluster breaking effects on cluster structures in 12C (2016)
  • Author(s): Tadahiro Suhara
  • Organizer: 11th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (Cluster16)
  • Place of Presentation: Napoli, Italy
  • Year and Date: 2016-05-23
  • Int'l Joint Research
• [Presentation] テンソル最適化反対称化分子動力学による4Heの励起状態 (2016)
  • Author(s): 須原唯広、明孝之、土岐博、堀内昶、池田清美
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] テンソル最適化反対称化分子動力学を用いたp殻核の研究 (2015)
  • Author(s): 須原唯広、明孝之、土岐博、堀内昶、池田清美
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 大阪市立大
  • Year and Date: 2015-09-25
• [Presentation] 12C, 16Oにおけるクラスター構造とモノポール遷移 (2015)
  • Author(s): 須原唯広
  • Organizer: RCNP研究会「アイソスカラー型単極遷移で探る原子核の励起状態とクラスター構造」
  • Place of Presentation: 大阪大学RCNP
  • Year and Date: 2015-07-16