対相関を取り込んだ多体ダイナミックスと２核子放出崩壊現象への応用

• Project/Area Number: 14F04769
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 外国
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: 萩野 浩一 東北大学, 理学研究科, 准教授 (20335293)
• Co-Investigator(Kenkyū-buntansha): SCAMPS GUILLAUME 東北大学, 理学研究科, 外国人特別研究員 ; SCAMPS Guillaume 東北大学, 理学(系)研究科(研究院), 外国人特別研究員
• Project Period (FY): 2014-04-25 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥2,300,000 (Direct Cost: ¥2,300,000); Fiscal Year 2016: ¥400,000 (Direct Cost: ¥400,000); Fiscal Year 2015: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2014: ¥800,000 (Direct Cost: ¥800,000)
• Keywords: 対相関 / 時間依存アプローチ / 核子移行反応 / 対称性とゲージ角 / 核融合反応 / 励起エネルギー / 量子数射影法 / 対移行反応 / 核分裂 / 慣性質量 / 平均場近似 / 結合チャンネル法 / 半古典近似 / 量子トンネル効果 / 時間依存法 / 平均場理論 / 半古典論 / 崩壊幅 / 共鳴状態

Outline of Annual Research Achievements

時間に依存する平均場理論による重イオン多核子移行反応の記述を、入射核と標的核の両方が超流動状態となっている場合に拡張した。このような系では入射核と標的核の両方が粒子数保存を破るが、そのような場合でも移行確率を求めることができる量子数射影法を新たに開発した。この方法は原子核におけるジョセフソン効果および重イオン反応における障壁分布に対する新しい知見をもたらすものである。この方法を簡単な模型に適用し、方法の妥当性を確認した。この研究成果に関する投稿論文を現在準備中である。

また、核子移行反応と重イオン核融合反応を同時に記述する現象論的模型を構築した。これまでの模型では、これらの反応過程の断面積の実験データを同時に再現することができなかった。本研究で、核子移行後の原子核の集団励起状態の変化を考慮することによって、40Ca+96Zr　系及び40Ca+64Ni　系に対する核子移行反応と核融合反応の実験データを同時に再現することに成功した。

さらに、フランスの国立加速器研究施設（GANIL）の実験グループと共同研究を行い、各移行チャンネルに対して重心系のエネルギーの関数としてフラグメントの励起エネルギーを決定する方法を開発した。この方法では、時間に依存する平均場理論を用いて核子移行の確率及び平均的な励起エネルギーを求める。この方法を 12C+238U 反応に適用し、最近GANIL で測定された実験データの解析を行った。核融合反応との競合をきちんと考慮すると、この方法で計算された励起エネルギーが実験データをよく再現することを明らかにした。

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] ストラスブール大学/オルセー原子核研究所/国立加速器研究施設(フランス)
• [Int'l Joint Research] ドゥブナ合同原子核研究所(ロシア連邦)
• [Int'l Joint Research] IPN オルセー(フランス)
• [Int'l Joint Research] オーストラリア国立大学(オーストラリア)
• [Journal Article] Time-dependent mean field determination of the excitation energy in transfer reactions: application to the reaction 238U on 12C at 6.14 MeV/A (2017)
  • Author(s): Guillaume Scamps, C. Rodriguez-Tajes, D. Lacroix, and F. Farget
  • Journal Title: Phys. Rev. C Volume: 95 Issue: 2
  • DOI: 10.1103/physrevc.95.024613
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Gauge angle dependence in time-dependent Hartree-Fock-Bogoliubov calculations of 20O +20O head-on collisions with the Gogny interaction (2016)
  • Author(s): Yukio Hashimoto and Guillaume Scamps
  • Journal Title: Phys. Rev. C Volume: 94 Issue: 1
  • DOI: 10.1103/physrevc.94.014610
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Pairing effects in nuclear dynamic (2016)
  • Author(s): Denis Lacroix, Guillaume Scamps, and Yusuke Tanimura
  • Journal Title: EPJ Web of Conferences Volume: 117 Pages: 07002-07002
  • DOI: 10.1051/epjconf/201611707002
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Fission life-time calculation using a complex absorbing potential (2016)
  • Author(s): G. Scamps and K. Hagino
  • Journal Title: EPJ Web of Conference Volume: 122 Pages: 01004-01004
  • DOI: 10.1051/epjconf/201612201004
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Collective aspects of microscopic mean-field evolution along the fission path (2016)
  • Author(s): Y. Tanimura, D. Lacroix and G. Scamps
  • Journal Title: EPJ Web of Conferences Volume: 107 Pages: 07002-07002
  • DOI: 10.1051/epjconf/201610707002
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Extraction of pure transfer probabilities from experimental transfer and capture data (2016)
  • Author(s): Guillaume Scamps, VV Sargsyan, GG Adamian, NV Antonenko, and D Lacroix
  • Journal Title: Phys. Rev. C Volume: 94 Issue: 6
  • DOI: 10.1103/physrevc.94.064606
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Superfluid fission dynamics with microscopic approaches (2016)
  • Author(s): C. Simenel, G. Scamps, D. Lacroix, and A. S. Umar
  • Journal Title: EPJ Web of Conferences Volume: 107
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Enhancement factor for two-neutron transfer reactions with a schematic coupled-channels model (2015)
  • Author(s): K. Hagino and G. Scamps
  • Journal Title: Phys. Rev. C Volume: 92 Issue: 6
  • DOI: 10.1103/physrevc.92.064602
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Coupled-channels description of multinucleon transfer and fusion reactions at energies near and far below the Coulomb barrier (2015)
  • Author(s): G. Scamps and K. Hagino
  • Journal Title: Phys. Rev. C Volume: 92 Issue: 5
  • DOI: 10.1103/physrevc.92.054614
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Microscopic description of large amplitude collective motion in the nuclear astrophysics context (2015)
  • Author(s): D. Lacroix, Y. Tanimura, G. Scamps, and C. Simenel
  • Journal Title: Int. J. of Mod. Phys. E Volume: 24 Issue: 09 Pages: 1541005-1541005
  • DOI: 10.1142/s0218301315410050
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Collective aspects deduced from time- dependent microscopic mean-field with pairing: application to the fission process (2015)
  • Author(s): Y. Tanimura, D. Lacroix, and G. Scamps
  • Journal Title: Phys. Rev. C Volume: 92 Issue: 3
  • DOI: 10.1103/physrevc.92.034601
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Recent progress in the microscopic description of small and large amplitude collective motion (2015)
  • Author(s): D. Lacroix, S. Ayik, G. Scamps, C. Simenel, Y. Tanimura and B. Yilmaz
  • Journal Title: AIP Conf. Proc. Volume: 1681 Pages: 040001-040001
  • DOI: 10.1063/1.4932262
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Dynamical description of the fission process using the TD-BCS theory (2015)
  • Author(s): G. Scamps, C. Simenel, and D. Lacroix
  • Journal Title: AIP Conf. Proc. Volume: 1681 Pages: 040003-040003
  • DOI: 10.1063/1.4932264
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Multi-dimensional fission model with a complex absorbing potential (2015)
  • Author(s): G. Scamps and K. Hagino
  • Journal Title: Phys. Rev. C Volume: 91 Issue: 4
  • DOI: 10.1103/physrevc.91.044606
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Microscopic description of the transfer and fusion reactions including pairing correlations (2017)
  • Author(s): G. Scamps
  • Organizer: FUSION17
  • Place of Presentation: ホバート（オーストラリア）
  • Int'l Joint Research
• [Presentation] Simultaneous description of multi-nucleon transfer and fusion reactions with the coupled channel method (2017)
  • Author(s): G. Scamps
  • Organizer: Workshop on low-energy nuclear reaction theory (LENRT)
  • Place of Presentation: キャンベラ（オーストラリア）
  • Int'l Joint Research
• [Presentation] Josephson effect in nuclear reactions, effect of the restoration of the gauge angle symmetry in mean-field dynamics (2016)
  • Author(s): G. Scamps
  • Organizer: Tsukuba CCS-RIKEN joint workshop
  • Place of Presentation: 筑波大学（茨城県つくば市）
  • Int'l Joint Research / Invited
• [Presentation] Microscopic description of the transfer reaction including pairing correlations (2016)
  • Author(s): G. Scamps
  • Organizer: Heavy-ion accelerator symposium
  • Place of Presentation: キャンベラ（オーストラリア）
  • Int'l Joint Research / Invited
• [Presentation] Description of multi-nucleon transfer and fusion reactions with the coupled channel method (2016)
  • Author(s): G. Scamps
  • Organizer: International Nuclear Physics Conference
  • Place of Presentation: アデレード（オーストラリア）
  • Int'l Joint Research
• [Presentation] Coupled-channels description of multi-nucleon transfer and fusion reactions (2015)
  • Author(s): G. Scamps
  • Organizer: 2015 SKLTP-BLTP Joint Workshop on Physics of Strong Interaction
  • Place of Presentation: 吉林（中国）
  • Year and Date: 2015-11-01
  • Int'l Joint Research / Invited
• [Presentation] Dynamical description of fission (2015)
  • Author(s): G. Scamps
  • Organizer: YIPQS long-term workshop on Computational Advances in Nuclear and Hadron Physics (CANHP2015)
  • Place of Presentation: 京都大学（京都府京都市）
  • Year and Date: 2015-10-28
  • Int'l Joint Research / Invited
• [Presentation] Microscopic description of fission using dynamical theories (2015)
  • Author(s): G. Scamps
  • Organizer: The 5th international workshop on compound-nuclear reactions and related topics (CNR*15)
  • Place of Presentation: 東京工業大学（東京都目黒区）
  • Year and Date: 2015-10-19
  • Int'l Joint Research
• [Presentation] Effect of pairing on nuclear dynamics (2015)
  • Author(s): G. Scamps
  • Organizer: Workshop on many-body correlations in microscopic nuclear models
  • Place of Presentation: 尖閣荘（新潟県佐渡市）
  • Year and Date: 2015-08-24
  • Int'l Joint Research / Invited
• [Presentation] Microscopic description of fission using dynamical theories (2015)
  • Author(s): G. Scamps
  • Organizer: Nucleus Nucleus 2015
  • Place of Presentation: カタニア（イタリア）
  • Year and Date: 2015-06-23
  • Int'l Joint Research
• [Presentation] Microscopic description of fission using dynamical theory (2015)
  • Author(s): G. Scamps
  • Organizer: Nuclear Structure and Dynamics III
  • Place of Presentation: ポルトローズ（スロベニア）
  • Year and Date: 2015-06-16
  • Int'l Joint Research
• [Presentation] Superfluid dynamics of 258Fm fission with the TDHF+BCS theory (2015)
  • Author(s): G. Scamps
  • Organizer: FUSTIPEN meeting on New Directions for Nuclear Structure and Reaction Theories
  • Place of Presentation: GANIL （カーン、フランス）
  • Year and Date: 2015-03-18
• [Presentation] Microscopic description of fission dynamic, effect of pairing in the 258Fm fission modes (2014)
  • Author(s): G. Scamps
  • Organizer: 22nd ASRC International Workshop “Nuclear Fission and Exotic Nuclei”
  • Place of Presentation: 日本原子力研究開発機構（東海村）
  • Year and Date: 2014-12-03