A new method for total-photoabsorption measurement of exotic nucleio

• Project/Area Number: 26610053
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: SUDA Toshimi 東北大学, 電子光理学研究センター, 教授 (30202138)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 短寿命不安定核 / 光核反応断面積 / 仮想光子法 / SCRIT / 電子散乱 / 光吸収断面積 / SCRIT法 / 中性子検出 / 制動輻射 / 光吸収過程 / 双極子巨大共鳴 / γ線吸収断面積 / 仮想光子 / 巨大共鳴

Outline of Final Research Achievements

The final goal of this research is to measure the photoabsorption cross section of short-lived exotic nuclei covering the giant dipole resonance for the first time using electron beam. The SCRIT scheme we have invented for the structure studies of exotic nuclei by electron scattering was found to provide a new way to measure their photo-absorption cross section. Under the luminosity of 10**27 / cm 2 / s, needed for elastic electron scattering, inelastically scattered electrons at ultra-forward direction are detected inside the accelerator, and the measured inelastic cross section is converted to that of photoabsorption cross section by using virtual photon theory. It was clearly shown that inelastically scattered electrons resulting target-nucleus excitation can be detected even in the vicinity of the circulating electron beam of 200 mA. This clearly demonstrate that this ground-breaking new method for photonuclear reaction of exotic nuclei can be used for future experiment.

Research Products

• [Int'l Joint Research] 山東大学/北京大学(中国)
• [Int'l Joint Research] Saclay 研究所(フランス)
• [Int'l Joint Research] GSI研究所(ドイツ)
• [Int'l Joint Research] Johannesburg 大学(南アフリカ)
• [Int'l Joint Research] 山東大学/北京大学(中国)
• [Int'l Joint Research] ヨハネスブルグ大学(南アフリカ)
• [Int'l Joint Research] ミラノ大学(イタリア)
• [Journal Article] Prospects of Electron Scattering on unstable , exotic nuclei (2017)
  • Author(s): T. Suda and H. Simon
  • Journal Title: Progress of Particle and Nuclear Physics Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] The SCRIT electron scattering facility project at RIKEN RI beam factory (2015)
  • Author(s): T Ohnishi, A Enokizono, M Hara, T Hori, S Ichikawa, K Kurita, S Matsuo, T Suda, T Tamae, M Togasaki, K Tsukada, T Tsuru, S Wang, S Yoneyama and M Wakasugi
  • Journal Title: Physics Scripta Volume: T166 Pages: 014071-014071
  • DOI: 10.1088/0031-8949/2015/t166/014071
  • Peer Reviewed
• [Journal Article] SCRIT Electron Scattering Facility (2015)
  • Author(s): Toshimi Suda, Akitomo Enozokizono, Masahiro Hara, Yuji Haraguchi, Sin’ichi Ichikawa, Kazuyoshi Kurita, Saki Matsuo, Tetsuya Ohnishi, Tadaaki Tamae, Mamoru Togasaki,Kyo Tsukada,Teruaki Tsuru, Shuo Wang, Shunpei Yoneyama and Masanori Wakasugi
  • Journal Title: JPS Conference Proceedings Volume: 6 Pages: 030100-030100
  • DOI: 10.7566/jpscp.6.030100
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Electron Scattering for Exotic Nuclei (2014)
  • Author(s): T. Suda
  • Journal Title: Pramana Journal of Physics Volume: 83 Issue: 5 Pages: 739-747
  • DOI: 10.1007/s12043-014-0865-8
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Electron Scattering Activities in Japan (2017)
  • Author(s): Toshimi Suda
  • Organizer: Invited seminar at RAON facility
  • Place of Presentation: Daejon, Korea
  • Invited
• [Presentation] Electron Scattering Activities in Japan (2017)
  • Author(s): Toshimi Suda
  • Organizer: Invited seminar at Seoul National University
  • Place of Presentation: Seoul, Korea
  • Invited
• [Presentation] SCRIT法を用いた電子・不安定核散乱実験に向けた電子スペクトロメータのアクセプタンス評価 (2016)
  • Author(s): 塚田暁,市川進一,榎園昭智,大西哲哉,栗田和好, 古小路裕樹 須田利美, 玉江忠明,水流輝明,戸ケ崎衛,原雅弘,堀利匡, 松田一衛,山田耕平,若杉昌徳,渡辺正満
  • Organizer: 日本物理学会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-21
• [Presentation] SCRIT法を用いたXe同位体標的における電子散乱のルミノシティ測定 (2016)
  • Author(s): 榎園昭智,塚田暁,市川進一,大西哲哉,栗田和好, 古小路裕樹 須田利美, 玉江忠明,水流輝明,戸ケ崎衛,原雅弘,堀利匡, 松田一衛,山田耕平,若杉昌徳,渡辺正満
  • Organizer: 日本物理学会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-21
• [Presentation] Future perspectives of the SCRIT facility (2016)
  • Author(s): Toshimi Suda
  • Organizer: Electron-radioactive ion collisions : theoretical and experimental challenges
  • Place of Presentation: Orsay, France
  • Int'l Joint Research / Invited
• [Presentation] SCRIT electron scattering facility : present status and future perspectives (2016)
  • Author(s): Toshimi Suda
  • Organizer: Neutron Skins of Nuclei
  • Place of Presentation: Mainz, Germany
  • Int'l Joint Research / Invited
• [Presentation] SCRIT法を用いたXe同位体標的における電子散乱の角度分布測定 (2015)
  • Author(s): 塚田暁, 足立江介，市川進一，榎園昭智、大西哲哉，栗田和好，須田利美， 玉江忠明，水流照明，戸ヶ崎衛，原正弘，藤田峻広，堀利匡，堀充希， 松田一衛，山田耕平，若杉昌徳，渡辺正満
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪市立大学（大阪府大阪）
  • Year and Date: 2015-10-27
• [Presentation] SCRIT法を用いた電子・不安定核散乱実験に向けたルミノシティ決定精度の評価 (2015)
  • Author(s): 榎園昭智、塚田暁, 足立江介，市川進一，大西哲哉，栗田和好，須田利美， 玉江忠明，水流照明，戸ヶ崎衛，原正弘，藤田峻広，堀利匡，堀充希， 松田一衛，山田耕平，若杉昌徳，渡辺正満
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪市立大学（大阪府大阪）
  • Year and Date: 2015-10-26
• [Presentation] Commissioning of SCRIT electron scattering facility (2015)
  • Author(s): K.Tsukada, A.Enokizono, K.Kurita, T.Ohnishi, T.Suda, T.Tamae, M.Togasaki, T.Tsuru, K.Yamada, M.Wakasugi, M.Watanabe
  • Organizer: RIBF International Users meeting 2015
  • Place of Presentation: 理化学研究所（埼玉県和光市）
  • Year and Date: 2015-09-10
  • Int'l Joint Research
• [Presentation] Electron Scattering for Exotic Nuclei (2015)
  • Author(s): T. Suda
  • Organizer: 第３８回原子核物理学シンポジウム
  • Place of Presentation: メキシコ・ココヨック
  • Year and Date: 2015-01-07
  • Invited
• [Presentation] SCRIT Electron Scattering Facility (2014)
  • Author(s): T. Suda
  • Organizer: 第５９回南アフリカ物理学会
  • Place of Presentation: 南アフリカ・ヨハネスブルグ
  • Year and Date: 2014-07-09
  • Invited
• [Remarks] SCRIT group
  • URL: http://www.lns.tohoku.ac.jp/~scrit/SCRIT_Sendai_J/SCRIT_MainPage.html
• [Remarks] Research Map
  • URL: http://researchmap.jp/toshimi.suda/
• [Remarks] SCRIT実験
  • URL: http://www.lns.tohoku.ac.jp/%7Escrit/SCRIT_Sendai_e/SCRIT_Sendai_e/SCRIT_MainPage.html
• [Remarks] SCRIT group
  • URL: http://www.riken.jp/en/research/labs/rnc/instrum_dev/scrit/
• [Remarks] SCRIT Home Page (Tohoku Group)
  • URL: http://www.lns.tohoku.ac.jp/~scrit/SCRIT_Sendai_J/SCRIT_MainPage.html
• [Remarks] RI・電子散乱装置開発チーム
  • URL: http://www.riken.jp/research/labs/rnc/instrum_dev/scrit/