Clarification of neutron-proton pairing correlation and condensation

• Project/Area Number: 16K17680
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of Tsukuba
• Principal Investigator: Hinohara Nobuo 筑波大学, 計算科学研究センター, 助教 (80511435)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); 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: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 原子核密度汎関数法 / 対相関 / 線形応答 / 対称性の自発的破れ / 二重ベータ崩壊 / 荷電交換過程

Outline of Final Research Achievements

Atomic nuclei are composed of neutrons and protons, and their low-energy states are strongly affected by the two-nucleon pair correlations. In this research we showed the possibility of determination of the pairing coupling constants using the pairing rotational moment of inertia that was proposed as a new experimental indicator of the nuclear pairing condensation. We also implemented the neutron-proton pairing in the nuclear density functional theory solver and analyzed the neutron-proton pair condensed phase in proton-rich unstable nuclei.
We showed the importance of the isospin symmetry in the pairing channel in a realistic system with the isospin symmetry broken by the Coulomb interaction.

Academic Significance and Societal Importance of the Research Achievements

中性子－陽子対凝縮相が陽子過剰不安定核の基底状態で発現するかどうかは原子核構造理論の重要な未解決問題である。さらにこれらの原子核は元素合成過程であるｒｐプロセスの経路上に位置するため、重元素生成の理解にもつながる。本研究で行った対回転の慣性モーメントによる対相関の詳細の決定、さらに世界に先駆けて開発した中性子－陽子対相関を含む原子核密度汎関数法の計算コードは、中性子－陽子対凝縮相の完全な理解に向けた重要な成果であると位置づけられる。

Research Products

• [Int'l Joint Research] ミシガン州立大学(米国)
• [Int'l Joint Research] ミシガン州立大学(米国)
• [Int'l Joint Research] ミシガン州立大学(米国)
• [Int'l Joint Research] ミシガン州立大学(米国)
• [Int'l Joint Research] カシミア大学(インド)
• [Journal Article] 二重ベータ崩壊原子核行列要素と中性子－陽子対相関 (2020)
  • Author(s): 日野原 伸生
  • Journal Title: 原子核研究 Volume: 64 Pages: 102-113
• [Journal Article] Energy-weighted sum rule for nuclear density functional theory (2019)
  • Author(s): Hinohara Nobuo
  • Journal Title: Physical Review C Volume: 100 Issue: 2 Pages: 024310-024310
  • DOI: 10.1103/physrevc.100.024310
  • Peer Reviewed
• [Journal Article] Efficient QRPA calculation for two-neutrino double-beta decay nuclear matrix element (2019)
  • Author(s): Hinohara Nobuo
  • Journal Title: AIP Conference Proceedings Volume: 2165 Pages: 020010-020010
  • DOI: 10.1063/1.5130971
• [Journal Article] 原子核集団現象への平均場アプローチ (2019)
  • Author(s): 日野原 伸生
  • Journal Title: 原子核研究 Volume: 63 Supplement 1 Pages: 5-12
• [Journal Article] Low-lying collective excited states in nonintegrable pairing models based on the stationary-phase approximation to the path integral (2018)
  • Author(s): Ni Fang、Hinohara Nobuo、Nakatsukasa Takashi
  • Journal Title: Physical Review C Volume: 98 Issue: 6 Pages: 064327-064327
  • DOI: 10.1103/physrevc.98.064327
  • NAID: 120007128269
  • Peer Reviewed
• [Journal Article] Extending pairing energy density functional using pairing rotational moments of inertia (2018)
  • Author(s): Nobuo Hinohara
  • Journal Title: Journal of Physics G: Nuclear and Particle Physics Volume: 45 Issue: 2 Pages: 024004-024004
  • DOI: 10.1088/1361-6471/aa9f8b
  • Peer Reviewed
• [Presentation] Neutron-proton pairing in nuclear density functional theory (2020)
  • Author(s): Nobuo Hinohara
  • Organizer: NSCL Theory Seminar
  • Invited
• [Presentation] Skyrme型密度汎関数へのアイソベクトル型中性子－陽子対相関の導入 (2020)
  • Author(s): 日野原 伸生, Javid Sheikh, Jacek Dobaczewski, Witold Nazarewicz
  • Organizer: 日本物理学会第75回年次大会(現地開催中止)
• [Presentation] Pairing rotation and pairing energy density functional (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: Nuclear Structure and Dynamics (NSD2019)
  • Int'l Joint Research
• [Presentation] Efficient QRPA calculation for two-neutrino double-beta decay nuclear matrix element (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: Matrix Elements for the Double beta decay Experiments (MEDEX'19)
  • Int'l Joint Research / Invited
• [Presentation] Neutron-proton pairing in nuclear density functional theory (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: Nuclear Physics Symposium "Challenges in theory of heavy nuclei"
  • Int'l Joint Research / Invited
• [Presentation] Isovector pairing and nuclear mass (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: RIBF Week 2019
  • Int'l Joint Research / Invited
• [Presentation] Isovector neutron-proton pairing condensation in proton-rich unstable nuclei (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: The 5th workshop on many-body correlations in microscopic nuclear model (Sado2019)
• [Presentation] 二重ベータ崩壊原子核行列要素の核構造計算 (2019)
  • Author(s): 日野原 伸生
  • Organizer: 東北大学電子光理学研究センターELPHセミナー
  • Invited
• [Presentation] 有限振幅法を用いた2ニュートリノ二重ベータ崩壊原子核行列要素の計算 (2019)
  • Author(s): 日野原 伸生
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] Isovector pairing and nuclear mass (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: China-Japan Collaboration Workshop on "Nuclear Mass and Life for Unraveling Mysteries of R-process"
• [Presentation] Isovector pairing energy density functional and pairing collective motion (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: Microscopic Approaches to Nuclear Structure and Reactions
  • Int'l Joint Research / Invited
• [Presentation] 原子核密度汎関数の決定と関連する実験データ (2019)
  • Author(s): 日野原 伸生
  • Organizer: RIBF若手放談会：エキゾチック核物理の将来
• [Presentation] Finite-amplitude method for double-beta decay nuclear matrix elements (2019)
  • Author(s): Nobuo Hinohara
  • Organizer: International Symposium on Revealing the history of the universe with underground particle and nuclear research 2019
  • Int'l Joint Research
• [Presentation] 原子核密度汎関数理論における和則に関するThoulessの定理 (2019)
  • Author(s): 日野原 伸生
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 原子核対相関と観測量 (2019)
  • Author(s): 日野原 伸生
  • Organizer: NITEP研究会「微視的理論でつなぐ散乱観測量と核構造」
• [Presentation] Collective motion in stable and unstable nuclei within nuclear density functional theory (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: IX International Symposium on Exotic Nuclei (EXON-2018)
  • Int'l Joint Research / Invited
• [Presentation] Application of finite-amplitude method for nuclear collective motion (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: PKU-CUSTIPEN workshop on "Low-Energy Nuclear Dynamics and Effective Nuclear Interactions"
  • Invited
• [Presentation] Nuclear collective excitation within finite-amplitude method (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: 10th international conference on Direct Reactions with Exotic Beams (DREB2018)
  • Int'l Joint Research
• [Presentation] 原子核集団現象への平均場アプローチ (2018)
  • Author(s): 日野原 伸生
  • Organizer: 第64回原子核三者若手夏の学校
  • Invited
• [Presentation] Neutron-proton DFT (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: The 4th workshop on many-body correlations in microscopic nuclear model (SADO2018)
• [Presentation] Nuclear density functional theory for collective excitation (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
  • Int'l Joint Research / Invited
• [Presentation] Double-beta decay nuclear matrix element using finite-amplitude method (2018)
  • Author(s): Nobuo Hinohara and Jonathan Engel
  • Organizer: 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
  • Int'l Joint Research
• [Presentation] "Nuclear density functional theory for description of collective excitation" (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: 10th China-Japan Joint Nuclear Physics Symposium (CJNP2018)
  • Int'l Joint Research / Invited
• [Presentation] Energy-weighted sum rule for nuclear density functional theory (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: 13th International Conference on Nucleus-Nucleus Collisions (NN2018)
  • Int'l Joint Research
• [Presentation] Binding-energy differences of even-even nuclei and pairing correlation (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: 13th International Conference on Nucleus-Nucleus Collisions (NN2018)
  • Int'l Joint Research
• [Presentation] Finite-amplitude method for double-beta decay (2018)
  • Author(s): Nobuo Hinohara
  • Organizer: Tsukuba-CCS workshop on “microscopic theories of nuclear structure and dynamics”
  • Int'l Joint Research
• [Presentation] 原子核密度汎関数理論による原子核構造とダイナミクス (2018)
  • Author(s): 日野原 伸生
  • 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] 原子核エネルギー密度汎関数の最適化に向けた巨大共鳴の効率的評価 (2017)
  • Author(s): 日野原 伸生, Markus Kortelainen, Witold Nazarewicz
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学豊中キャンパス
  • Year and Date: 2017-03-17
• [Presentation] 対相関と二重束縛エネルギー差 (2017)
  • Author(s): 日野原 伸生
  • 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: 大阪市立大学杉本キャンパス
  • Year and Date: 2017-01-19
• [Presentation] Pairing energy density functional constrained using pairing rotational moments of inertia (2017)
  • Author(s): Nobuo Hinohara
  • Organizer: Probing fundamental interactions by low energy excitations -Advances in theoretical nuclear physics
  • Int'l Joint Research
• [Presentation] Binding energy differences of even-even nuclei as pairing indicators (2017)
  • Author(s): Nobuo Hinohara
  • Organizer: China-Japan collaboration workshop on "Nuclear mass and life for unravelling mysteries of r-process"
  • Int'l Joint Research
• [Presentation] 不安定核での変形、対相関による大振幅集団運動 (2017)
  • Author(s): 日野原 伸生
  • Organizer: RIBF理論若手放談会：エキゾチック核物理の広がり
  • Invited
• [Presentation] 対相互作用の運動量依存項と関連する対相関観測量 (2017)
  • Author(s): 日野原 伸生
  • 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」
• [Presentation] 対回転の慣性モーメントを用いた対密度汎関数の精密化 (2017)
  • Author(s): 日野原 伸生
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Pairing Nambu-Goldstone modes in nuclei (2017)
  • Author(s): Nobuo Hinohara
  • Organizer: XXIV Nuclear Physics Workshop
  • Int'l Joint Research / Invited
• [Presentation] Extending pairing energy density functional using pairing rotational moments of inertia (2017)
  • Author(s): Nobuo Hinohara
  • Organizer: The International Symposium on Physics of Unstable Nuclei 2017 (ISPUN17)
  • Int'l Joint Research
• [Presentation] Pair condensation and Nambu-Goldstone modes in nuclei (2017)
  • Author(s): Nobuo Hinohara
  • Organizer: Workshop on Nuclear Cluster Physics 2017 (WNCP2017)
  • Int'l Joint Research
• [Presentation] Pairing rotational modes and binding-energy differences of even-even nuclei (2017)
  • Author(s): Nobuo Hinohara
  • Organizer: IIRC symposium "Perspectives of the physics of nuclear structure"
  • Int'l Joint Research
• [Presentation] 有限原子核基底状態でのゲージ対称性の破れ (2017)
  • Author(s): 日野原 伸生
  • Organizer: KEK理論センター研究会『ハドロン・原子核物理の理論研究最前線 2017』
• [Presentation] New pairing observable: binding energy differences of even-even nuclei (2016)
  • Author(s): Nobuo Hinohara
  • Organizer: First Tsukuba-CCS-RIKEN joint workshop on microscopic theories of nuclear structure and dynamics
  • Place of Presentation: RIKEN Nishina Center/Center for Computational Sciences, University of Tsukuba, Japan
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Recent theoretical developments of finite-amplitude method for QRPA (2016)
  • Author(s): Nobuo Hinohara
  • Organizer: Recent Progresses in Nuclear Structure Physics 2016 (NSP2016)
  • Place of Presentation: Yukawa Institute for Theoretical Physics, Kyoto University, Japan
  • Year and Date: 2016-12-05
  • Int'l Joint Research
• [Presentation] 中性子－陽子対相関による二重ベータ崩壊原子核行列要素の抑制 (2016)
  • Author(s): 日野原 伸生
  • Organizer: 第8回「学際計算科学による新たな知の発見・統合・創出」シンポジウム －発展する計算科学と次世代の計算機－
  • Place of Presentation: 筑波大学
  • Year and Date: 2016-10-17
• [Presentation] 偶々核の束縛エネルギー差と対回転モード (2016)
  • Author(s): 日野原 伸生
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 宮崎大学木花キャンパス
  • Year and Date: 2016-09-21
• [Presentation] Pairing Nambu-Goldstone modes and binding-energy differences of even-even nuclei (2016)
  • Author(s): Nobuo Hinohara, Witold Nazarewicz
  • Organizer: International Nuclear Physics Conference (INPC2016)
  • Place of Presentation: Adelaide Convention Centre, Adelaide, Australia
  • Year and Date: 2016-09-11
  • Int'l Joint Research
• [Presentation] Neutron-proton superfluid DFT (2016)
  • Author(s): Nobuo Hinohara
  • Organizer: DOE topical collaboration meeting “Nuclear Theory for Double-Beta Decay and Fundamental Symmetries”
  • Place of Presentation: Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI, USA
  • Year and Date: 2016-08-01
  • Int'l Joint Research
• [Presentation] Binding energy differences of even-even nuclei as pairing indicators (2016)
  • Author(s): Nobuo Hinohara, Witold Nazarewicz
  • Organizer: Nuclear Structure 2016 (NS2016)
  • Place of Presentation: Knoxville TN, USA
  • Year and Date: 2016-07-24
  • Int'l Joint Research
• [Presentation] Pairing rotations in ground states of open-shell even-even deformed nuclei (2016)
  • Author(s): Nobuo Hinohara, Witold Nazarewicz
  • Organizer: Direct Reactions with Exotic Beams (DREB2016)
  • Place of Presentation: Saint Mary's University, Halifax, Canada
  • Year and Date: 2016-07-11
  • Int'l Joint Research
• [Presentation] Nuclear collective excitation modes within finite-amplitude method (2016)
  • Author(s): Nobuo Hinohara
  • Organizer: 14th International Symposium on Nuclei in the Cosmos XIV (NIC-XIV)
  • Place of Presentation: Toki Messe, Niigata, Japan
  • Year and Date: 2016-06-19
  • Int'l Joint Research
• [Presentation] FAM Applications Towards EDF Optimization (2016)
  • Author(s): Nobuo Hinohara
  • Organizer: NUCLEI SciDAC 2016 Project Meeting
  • Place of Presentation: Argonne National Laboratory, Argonne, IL, USA
  • Year and Date: 2016-06-06
  • Int'l Joint Research