Electron scattering from unstable nucleus with 3-dimensional trajectory analysis

• Project/Area Number: 17H04835
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: Tsukada Kyo 東北大学, 電子光理学研究センター, 助教 (10422073)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000); Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2017: ¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
• Keywords: 電子散乱 / 不安定核 / 原子核 / 不安定原子核 / 核構造

Outline of Final Research Achievements

By remodeling the forward detector of the electron spectrometer in the SCRIT electron scattering facility, it became possible to reconstruct the scattered electron trajectory three-dimensionally. Moreover, by using the three-dimensional drive type three-dimensional magnetic field measuring device manufactured in this research project, a magnetic field map in the spectrometer magnet was created and the momentum resolution of the spectrometer was improved. Furthermore, the performance of the spectrometer was evaluated from the width of the elastic scattering peak found in the momentum spectrum of the scattered electrons by using the newly manufactured carbon thin film target. In particular, we succeeded in separating and observing the peak of the first excited state (4.4 MeV) of carbon next to the elastic scattering peak. This is completely ready for the experiment with the coming unstable nuclear target.

Academic Significance and Societal Importance of the Research Achievements

電子散乱は物質の構造を調べる上で強力な手法である。これは原子核構造に対しても同様で、１９５０年代にその有用性が示されて以来、原子核の基本的な性質の多くが電子散乱によって明らかにされてきた。近年世界中で活発な研究が行われている、短寿命・不安定核の性質を電子散乱で調べることを可能にするのがSCRIT法である。本研究課題では、SCRIT実験にて使用する電子スペクトロメータを要求性能を満たすように改良・発展させるもので、ほぼ成功裏に完了した。

Research Products

• [Journal Article] Electron scattering from 208Pb and 132Xe ions at the SCRIT facility (2019)
  • Author(s): Kyo Tsukada, Kousuke Adachi, Akitomo Enokizono, Takahiro Fujita, Masahiro Hara, Toshitada Hori, Mitsuki Hori, Shin-ichi Ichikawa, Keita Kasama, Kazuyoshi Kurita, Kazuki Namba, Tetsuya Ohnishi, Toshimi Suda, Tadaaki Tamae, Mamoru Togasaki, Masanori Wakasugi, Masamitsu Watanabe & Kouhei Yamada
  • Journal Title: Hyperfine Interactions Volume: 102
  • Peer Reviewed
• [Journal Article] The SCRIT Electron Scattering Facility at RIKEN: The World's First Electron Femtoscope for Short-Lived Unstable Nuclei (2018)
  • Author(s): Enokizono A.、Ohnishi T.、Tsukada K.
  • Journal Title: Nuclear Physics News Volume: 28 Issue: 2 Pages: 18-22
  • DOI: 10.1080/10619127.2018.1427951
  • Peer Reviewed
• [Journal Article] First Elastic Electron Scattering from 132Xe at the SCRIT Facility (2017)
  • Author(s): K. Tsukada, A. Enokizono, T. Ohnishi, K. Adachi, T. Fujita, M. Hara, M. Hori, T. Hori, S. Ichikawa, K. Kurita, K. Matsuda, T. Suda, T. Tamae, M. Togasaki, M. Wakasugi, M. Watanabe, and K. Yamada
  • Journal Title: Phys. Rev. Lett. Volume: 118 Issue: 26 Pages: 262501-262501
  • DOI: 10.1103/physrevlett.118.262501
  • Peer Reviewed
• [Presentation] 炭素標的を用いたSCRIT実験用電子スペクトロメータの性能評価 (2020)
  • Author(s): 塚田暁
  • Organizer: 日本物理学会第75回年次大会
• [Presentation] Present status and prospects of the SCRIT electron scattering facility (2019)
  • Author(s): K. Tsukada
  • Organizer: The 9th International Symposium on Nuclear Symmetry Energy (NuSYM2019)
  • Int'l Joint Research
• [Presentation] Present status of SCRIT electron scattering facility (2019)
  • Author(s): K. Tsukada
  • Organizer: The 14th Asia-Pacific Physics Conference (APPC2019)
  • Int'l Joint Research
• [Presentation] 電子・不安定核散乱実験用ドリフトチェンバーの開発と性能評価 (2019)
  • Author(s): 塚田暁、青柳泰平、笠間桂太、須田利美、高山祥汰、玉江忠明、南波和希、本多佑記、和宇慶ひかり、市川進一、大西哲也、榎園昭智、原雅弘、堀利匡、若杉昌徳、渡邉正満、栗田和好、佐藤蒼、中野萌絵
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] SCRIT実験に用いる電子スペクトロメーターの精密磁場測定 (2019)
  • Author(s): 和宇慶ひかり、青柳 泰平、笠間 桂太、須田 利美、髙山 祥汰、 玉江 忠明、塚田 暁、南波 和希、本多 佑記、市川 進一、榎園 昭智、大西 哲哉、原 雅弘、 堀 利匡、若杉 昌徳、渡邊 正満、栗田 和好、佐藤 蒼、中野 萌絵
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Present status of the SCRIT electron scattering facility (2018)
  • Author(s): K. Tsukada, Y. Honda, K. Kasama, K. Namba, T. Suda, S. Takayama, T. Tamae, K. Tsukada, H. Wauke, A. Enokizono, M. Hara, T. Hori, S. Ichikawa, T. Ohnishi, M. Wakasugi, M. Watanabe, K. Kurita, M. Nakano, S. Sato, R. Ogawara
  • Organizer: fifth joint meeting of the Division of Nuclear Physics of the APS the JPS
  • Int'l Joint Research
• [Presentation] Present status of the electron scattering experiments at the SCRIT facility (2018)
  • Author(s): K. Tsukada for the SCRIT collaboration
  • Organizer: ECT*研究会 “Probing exotic structure of short-lived nuclei by electron scattering”
  • Int'l Joint Research / Invited
• [Presentation] Electron scattering from 208Pb and 13Xe ions at the SCRIT facility (2018)
  • Author(s): K. Tsukada for the SCRIT collaboration
  • Organizer: The 7th International Conference on Trapped Charged Particles and Fundamental Physics (TCP2018)
  • Int'l Joint Research / Invited
• [Presentation] The SCRIT electron scattering facility: Toward the world’s first study of unstable nuclei by electron scattering (2018)
  • Author(s): 塚田暁
  • Organizer: PRL６０周年シンポジウム、日本物理学会2018年秋季大会
  • Invited
• [Presentation] SCRIT電子スぺクトロメーター性能向上に向けた飛程検出器の開発 (2018)
  • Author(s): 高山祥太、青柳泰平、笠間桂太、須田利美、玉江忠明、塚田暁、本多佑記
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] SCRIT実験：安定核標的による成果と今後 (2017)
  • Author(s): 塚田暁、市川進一、 内田信昭、榎園昭智、大西哲哉、笠間桂太、栗田和好、笹村薪之介、須田利美、玉江忠明、戸ケ崎衛、南波和希、原雅弘、堀利匡、堀充希、本多佑記、若杉昌徳、 渡邊正満
  • Organizer: 日本物理学会秋季大会
• [Presentation] First result from SCRIT electron scattering facility with 132Xe target (2017)
  • Author(s): K. Tsukada
  • Organizer: The 10th International Conference on Nuclear Physics at Storage Rings
  • Int'l Joint Research / Invited