Data-driven approaches in nuclear structure theory

• Project/Area Number: 17K05433
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: Shimizu Noritaka 東京大学, 大学院理学系研究科(理学部), 特任准教授 (30419254)
• Co-Investigator(Kenkyū-buntansha): 吉田 聡太 宇都宮大学, 大学教育推進機構, 特任助教 (10868665)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 原子核殻模型 / 不定性評価 / ベイズ統計 / 固有ベクトル連続性 / 近似解法 / eigenvector continuation / 原子核理論 / 大規模並列計算 / 原子核構造理論 / 殻模型計算 / 有効相互作用 / 原子核構造 / ベイズ推論 / 不安定核

Outline of Final Research Achievements

We aim to study structure of unstable nuclei which appear only in astrophysical condition or in accelerator experiments by performing nuclear shell-model calculations numerically. The results of shell-model calculations implicitly contain uncertainties originated from the model parameters. We introduced Bayes analysis to estimate these uncertainties. In addition, we introduced the method of eigenvector continuation into nuclear shell-model calculations in order to reduce computational resources required for the estimation.

Academic Significance and Societal Importance of the Research Achievements

中性子数が通常の安定核より多い中性子過剰不安定核は、寿命が短く天然には存在しないものの、元素合成過程の理解などに重要な役割を果たすため、加速器実験などで盛んに調べられている。これらを理論で研究する有力な理論模型の一つである殻模型計算にいて、模型に内在するパラメータ由来の不定性を評価するための方法論を提唱した。

Research Products

• [Journal Article] Constructing approximate shell-model wavefunctions by eigenvector continuation (2022)
  • Author(s): Yoshida Sota、Shimizu Noritaka
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: -
  • DOI: 10.1093/ptep/ptac057
  • Peer Reviewed / Open Access
• [Journal Article] <i>β</i>-decay half-lives of neutron-rich N=82,81 isotones by shell-model calculations (2022)
  • Author(s): Shimizu Noritaka、Utsuno Yutaka、Togashi Tomoaki
  • Journal Title: EPJ Web of Conferences Volume: 260 Pages: 11049-11049
  • DOI: 10.1051/epjconf/202226011049
  • Peer Reviewed / Open Access
• [Journal Article] A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca (2022)
  • Author(s): Koiwai T.、Wimmer K.、Doornenbal P.、Obertelli A.、Barbieri C.、Duguet T.、Holt J.D.、Miyagi T.、Navratil P.、Ogata K.、Shimizu N.、Soma V.、Utsuno Y.、et al.
  • Journal Title: Physics Letters B Volume: 827 Pages: 136953-136953
  • DOI: 10.1016/j.physletb.2022.136953
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Generator-coordinate methods with symmetry-restored Hartree-Fock-Bogoliubov wave functions for large-scale shell-model calculations (2021)
  • Author(s): Shimizu Noritaka、Mizusaki Takahiro、Kaneko Kazunari、Tsunoda Yusuke
  • Journal Title: Physical Review C Volume: 103 Issue: 6 Pages: 064302-064302
  • DOI: 10.1103/physrevc.103.064302
  • Peer Reviewed
• [Journal Article] Gamow-Teller transitions of neutron-rich N = 82,81 nuclei by shell-model calculations (2021)
  • Author(s): Shimizu Noritaka、Togashi Tomoaki、Utsuno Yutaka
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2021 Issue: 3
  • DOI: 10.1093/ptep/ptab022
  • Peer Reviewed / Open Access
• [Journal Article] Quasi-SU(3) coupling of (1h11/2,2f7/2) across the N=82 shell gap: Enhanced E2 collectivity and shape evolution in Nd isotopes (2021)
  • Author(s): Kaneko K.、Shimizu N.、Mizusaki T.、Sun Y.
  • Journal Title: Physical Review C Volume: 103 Issue: 2
  • DOI: 10.1103/physrevc.103.l021301
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Structure of the 11/2- isomeric state in 133La (2020)
  • Author(s): Md. S. R. Laskar, R. Palit, S. N. Mishra, N. Shimizu, Y. Utsuno, E. Ideguchi, U. Garg, S. Biswas, F. S. Babra, R. Gala, C. S. Palshetkar, and Z. Naik
  • Journal Title: Phys. Rev. C Volume: 101 Issue: 3 Pages: 034315-034315
  • DOI: 10.1103/physrevc.101.034315
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Large-scale shell-model calculations of nuclear Schiff moments of Xe129 and Hg199 (2020)
  • Author(s): Yanase Kota、Shimizu Noritaka
  • Journal Title: Physical Review C Volume: 102 Issue: 6 Pages: 065502-065502
  • DOI: 10.1103/physrevc.102.065502
  • Peer Reviewed / Open Access
• [Journal Article] The impact of nuclear shape on the emergence of the neutron dripline (2020)
  • Author(s): Tsunoda Naofumi、Otsuka Takaharu、Takayanagi Kazuo、Shimizu Noritaka、Suzuki Toshio、Utsuno Yutaka、Yoshida Sota、Ueno Hideki
  • Journal Title: Nature Volume: 587 Issue: 7832 Pages: 66-71
  • DOI: 10.1038/s41586-020-2848-x
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Thick-restart block Lanczos method in nuclear shell-model calculations (2019)
  • Author(s): N. Shimizu, T. Mizusaki, Y. Utsuno and Y. Tsunoda
  • Journal Title: Comput. Phys. Comm. Volume: 244 Pages: 372-372
  • DOI: 10.1016/j.cpc.2019.06.011
  • Peer Reviewed
• [Journal Article] Ground-state properties of doubly magic nuclei from the unitary-model-operator approach with chiral two- and three-nucleon forces (2019)
  • Author(s): T. Miyagi, T. Abe, M. Kohno, P. Navratil, R. Okamoto, T. Otsuka, N. Shimizu, and S. R. Stroberg
  • Journal Title: Phys. Rev. C Volume: 100 Issue: 3 Pages: 034310-034310
  • DOI: 10.1103/physrevc.100.034310
  • Peer Reviewed
• [Journal Article] Isomer spectroscopy in Ba133 and high-spin structure of Ba134 (2019)
  • Author(s): Kaya L.、Vogt A.、Reiter P.、Siciliano M.、Shimizu N.、Utsuno Y.、他計70名
  • Journal Title: Physical Review C Volume: 100 Issue: 2 Pages: 024323-024323
  • DOI: 10.1103/physrevc.100.024323
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spin and parity determination of the 3.004-MeV level in Al27: Its low-lying multiplet structure (2019)
  • Author(s): Shizuma T.、Omer M.、Hajima R.、Shimizu N.、Utsuno Y.
  • Journal Title: Physical Review C Volume: 100 Issue: 1 Pages: 014307-014307
  • DOI: 10.1103/physrevc.100.014307
  • Peer Reviewed
• [Journal Article] g-factor measurement of the 2738 keV isomer in La135 (2019)
  • Author(s): Laskar Md. S. R.、Saha S.、Palit R.、Mishra S. N.、Shimizu N.、Utsuno Y.、Ideguchi E.、Naik Z.、Babra F. S.、Biswas S.、Kumar S.、Mohanta S. K.、Palshetkar C. S.、Singh P.、Srivastava P. C.
  • Journal Title: Physical Review C Volume: 99 Issue: 1 Pages: 014308-014308
  • DOI: 10.1103/physrevc.99.014308
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Uncertainty quantification in the nuclear shell model (2018)
  • Author(s): Yoshida Sota、Shimizu Noritaka、Togashi Tomoaki、Otsuka Takaharu
  • Journal Title: Physical Review C Volume: 98 Issue: 6 Pages: 061301-061301
  • DOI: 10.1103/physrevc.98.061301
  • Peer Reviewed
• [Journal Article] Variational Monte Carlo method for shell-model calculations in odd-mass nuclei and restoration of symmetry (2018)
  • Author(s): Shimizu Noritaka、Mizusaki Takahiro
  • Journal Title: Physical Review C Volume: 98 Issue: 5 Pages: 054309-054309
  • DOI: 10.1103/physrevc.98.054309
  • Peer Reviewed
• [Journal Article] Systematic shell-model study of β-decay properties and Gamow-Teller strength distributions in A?40 neutron-rich nuclei (2018)
  • Author(s): Yoshida Sota、Utsuno Yutaka、Shimizu Noritaka、Otsuka Takaharu
  • Journal Title: Physical Review C Volume: 97 Issue: 5 Pages: 054321-054321
  • DOI: 10.1103/physrevc.97.054321
  • Peer Reviewed
• [Journal Article] Why does the sign problem occur in evaluating the overlap of HFB wave functions? (2018)
  • Author(s): Mizusaki Takahiro、Oi Makito、Shimizu Noritaka
  • Journal Title: Physics Letters B Volume: 779 Pages: 237-243
  • DOI: 10.1016/j.physletb.2018.02.012
  • Peer Reviewed / Open Access
• [Journal Article] Double Gamow-Teller Transitions and its Relation to Neutrinoless β β Decay (2018)
  • Author(s): Noritaka Shimizu, Javier Menendez, and Kentaro Yako
  • Journal Title: Physical Review Letters Volume: 120 Issue: 14 Pages: 142502-142502
  • DOI: 10.1103/physrevlett.120.142502
  • Peer Reviewed
• [Presentation] 現実的有効相互作用を用いた殻模型によるシッフモーメントの評価 (2019)
  • Author(s): 清水則孝、柳瀬宏太
  • Organizer: 日本物理学会2019年秋の分科会
• [Presentation] 原子核殻模型計算と多様な変形バンド (2019)
  • Author(s): 清水則孝
  • Organizer: シミュレーションによる宇宙の基本法則と進化の解明に向けて (QUCS 2019)
  • Invited
• [Presentation] 制限ボルツマンマシンによる殻模型波動関数の記述 (2019)
  • Author(s): 清水則孝
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Large-scale shell model calculations and chiral doublet of 128Cs (2018)
  • Author(s): Noritaka Shimizu
  • Organizer: Nuclear Theory in the Supercomputing Era 2018 (NTSE-2018)
  • Int'l Joint Research / Invited
• [Presentation] Double Gamow-Teller transition and its relation to neutrinoless double-beta decay (2017)
  • Author(s): Noritaka Shimizu
  • Organizer: INT program INT-18-1a, "Nuclear ab initio theories and neutrino physics", Washington University, USA
  • Int'l Joint Research
• [Presentation] Shell model study on a double-beta decay nucleus 48Ca (2017)
  • Author(s): Noritaka Shimizu
  • Organizer: International workshop "Probing fundamental interactions by low energy excitations'', KTH Royal Institute of Technology, Sweden
  • Int'l Joint Research / Invited
• [Presentation] Recent progress of sign problem in Onishi formula (2017)
  • Author(s): N. Shimizu, T. Mizusaki and M. Oi
  • Organizer: 16th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS16), Shanghai Jing Tao University, Shanghai, China.
  • Int'l Joint Research
• [Presentation] 殻模型計算による核準位密度の微視的記述 (2017)
  • Author(s): 清水則孝
  • Organizer: 2017年度核データ研究会, 茨城県東海村、東海駅前・アイヴィル
• [Presentation] ボゴリューボフ準粒子基底によるモンテカルロ殻模型 (2017)
  • Author(s): 清水則孝
  • Organizer: 日本物理学会2017年秋季大会(宇都宮大学峰キャンパス峰キャンパス