Measurement of neutron capture cross sections of light nuclei related to r-process nucleosynthesis

• Project/Area Number: 25400304
• 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: Japan Atomic Energy Agency
• Principal Investigator: Makii Hiroyuki 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究員 (20425573)
• Co-Investigator(Renkei-kenkyūsha): Segawa Mariko 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門原子力基礎工学研究センター, 研究副主幹 (00435603) ; Nishinaka Ichiro 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門量子ビーム応用研究センター, 研究副主幹 (70354884) ; Nishio Katsuhisa 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門先端基礎研究センター, 研究主幹 (70343928) ; Hirose Kentaro 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究副主幹 (20436083) ; Orandi Riccardo 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門先端基礎研究センター, 研究員 (50737608)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 中性子捕獲反応 / 中性子捕獲断面積 / 元素合成 / r過程 / 核データ / r-過程 / ｒ-過程

Outline of Final Research Achievements

The neutron capture cross section with light elements such as Li and Be, plays an important role in explosive nucleosynthesis, like r(rapid)-process. Intense pulsed neutron beam provided by the MLF in the J-PARC and gamma-ray detectors with high efficiency, which are installed in the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Beam Line No. 4 of the MLF in the J-PARC, allow us to study neutron capture reactions with quite small cross sections. We have measured the neutron capture cross sections of Li-7 and Be-9.

Research Products

• [Journal Article] A Comprehensive Approach to Determination of Nuclear Data of Unstable Nuclei (2016)
  • Author(s): Satoshi Chiba, Katsuhisa Nishio, Yohihiro Aritomo, Hiroyuki Koura, Osamu Iwamoto, Hiroyuki Makii, Ichiro Nishinaka, and Kentaro Hirose
  • Journal Title: EPJ Web of Conferences Volume: 106 Pages: 04004-04004
  • DOI: 10.1051/epjconf/201610604004
  • Peer Reviewed
• [Journal Article] Development of a measurement system for the determination of (n,gamma) cross-sections using multi-nucleon transfer reactions (2015)
  • Author(s): H. Makii, S. Ota, T. Ishii, Y. Wakabayashi, K. Furutaka, I. Nishinaka, S. Chiba, M. Igasira, A. Czeszumska
  • Journal Title: Nuclear Instruments and Methods in Physics Research A Volume: 797 Pages: 83-93
  • DOI: 10.1016/j.nima.2015.05.005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Excitation energy dependence of fragment-mass distributions from fission of 180,190Hg formed in fusion reactions of 36Ar + 144,154Sm (2015)
  • Author(s): K. Nishio, A.N. Andreyev, R. Chapman, X. Derkx, Ch.E. Dullmann, L. Ghys, F.P. Hebberger, K. Hirose, H. Ikezoe, J. Khuyagbaatar, B. Kindler, B. Lommel, H. Makii, I. Nishinaka, T. Ohtsuki, S.D. Pain, S. Sagaidak, I. Tsekhanovich, M. Venhart, Y. Wakabayashi, S. Yan
  • Journal Title: Physics Letters B Volume: 748 Pages: 89-94
  • DOI: 10.1016/j.physletb.2015.06.068
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of neutron capture cross section of Li-7 at J-PARC / MLF / ANNRI (2014)
  • Author(s): H. Makii, M. Segawa, S. Ota, A. Kimura, I. Nishinaka, K. Nishio, H. Harada
  • Journal Title: AIP Coference Proceedings Volume: 1594 Pages: 345-350
  • DOI: 10.1063/1.4874093
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Development of Anti-Compton LaBr3(Ce) Spectrometer for Measurement of Surrogate Reactions (2014)
  • Author(s): H. Makii, S. Ota, T. Ishii, K. Nishio, I. Nishinaka, K. Furutaka, Y. Wakabayashi, S. Chiba, M. Igashira
  • Journal Title: Nuclear Data Sheets Volume: 119 Pages: 361-364
  • DOI: 10.1016/j.nds.2014.08.099
• [Journal Article] The 6Li(22Ne, 26Mg)d α-transfer experiment for the study of low-energy resonances in 22Ne(α,γ)26Mg (2014)
  • Author(s): Shuya Ota, Hiroyuki Makii, Tetsuro Ishii, Christopher Angell, Daniel W. Bardayan, Satoshi Chiba, Ichiro Nishinaka, Katsuhisa Nishio, Milan Matos, Shinichi Mitsuoka, and Steven Pain
  • Journal Title: EPJ Web of Conferences Volume: 66 Pages: 07017-07017
  • DOI: 10.1051/epjconf/20146607017
  • Peer Reviewed
• [Presentation] 大強度重イオンビームを用いた天体核反応率測定 (2016)
  • Author(s): 牧井 宏之
  • Organizer: 宇宙核物理連絡協議会（宇核連）研究会
  • Place of Presentation: 国立天文台三鷹キャンパス（東京都三鷹市）
  • Year and Date: 2016-02-22
  • Invited
• [Presentation] 235U熱中性子核分裂における即発ガンマ線スペクトルの測定 (2015)
  • Author(s): 牧井宏之、西尾勝久、西中一朗、廣瀬健太郎、Riccardo Orlandi、James Smallcombe、Romain Leguillon、関本俊、高宮幸一、大槻勤
  • Organizer: 第49回学術講演会
  • Place of Presentation: 京都大学原子炉実験所、大阪府
  • Year and Date: 2015-01-28 – 2015-01-29
• [Presentation] Be-9の中性子捕獲反応断面積測定 (2014)
  • Author(s): 牧井 宏之、R. Orlandi、廣瀬健太郎、西中一朗、西尾勝久、瀬川麻里子、木村敦、中村詔司
  • Organizer: 第3回ANNRI研究会
  • Place of Presentation: いばらき量子ビーム研究センター、茨城県
  • Year and Date: 2014-09-01
  • Invited
• [Presentation] Measurement of neutron capture reaction Be-9 at J-PARC / MLF / ANNRI (2014)
  • Author(s): H. Makii, R. Orlandi, K. Hirose, I. Nishinaka, K. Nishio, M. Segawa, A. Kimura, S. Nakamura
  • Organizer: 2nd International Symposium on Science at J-PARC
  • Place of Presentation: Tsukuba International Congress Center, Ibaraki, Japan
  • Year and Date: 2014-07-12 – 2014-07-15
• [Presentation] J-PARC/MLF/ANNRI を用いたLi-6,7 の中性子捕獲断面積測定 (2014)
  • Author(s): 牧井 宏之、瀬川 麻里子、太田 周也、木村 敦、西中 一朗、西尾 勝久、原田 秀郎
  • Organizer: 日本原子力学会2014 年春の年会
  • Place of Presentation: 東京都市大学、東京都
• [Presentation] 鏡映対称性の検証に向けたLi同位体の中性子捕獲ガンマ線の測定 (2013)
  • Author(s): 牧井 宏之
  • Organizer: 第2回ANNRI研究会
  • Place of Presentation: いばらき量子ビーム研究センター、茨城県
  • Invited
• [Presentation] Measurement of neutron capture cross section of Li-7 at J-PARC / MLF / ANNRI (2013)
  • Author(s): H. Makii, M. Segawa, S. Ota, A. Kimura, I. Nishinaka, K. Nishio, H. Harada
  • Organizer: The 12th International Symposium on Origin of Matter and Evolution of Galaxies - OMEG12
  • Place of Presentation: Tsukuba, Japan