Nucleosynthesis of gamma-ray emitter Al-26 in the Galxy

2011 Fiscal Year Final Research Report

• Project/Area Number: 21540295
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of Tsukuba
• Principal Investigator: KOMATSUBARA Tetsuro 筑波大学, 数理物質系, 講師 (10195852)
• Co-Investigator(Renkei-kenkyūsha): HAYAKAWA Takehito 日本原子力研究開発機構, 研究主幹 (70343944) ; SHIZUMA Toshiyuki 日本原子力研究開発機構, 研究主幹 (50282299)
• Project Period (FY): 2009 – 2011
• Keywords: 原子核(実験) / 宙元素合成 / アルミニウム26 / ガンマ線分光 / ガンマ線同時計数 / ガンマ線角度相関測定 / 原子核構造 / ゲルマニウム検出器

Research Abstract

Observation of gamma-rays originated from radioactive nucleus <26>^Al, whose half life is 720 thousand yr, is the crucial proof of nuclear synthesis in the Galaxy. In order to reproduce yield of the gamma-rays from <26>^Al, information of excited states in <26>^Si, which is located in bypass sequence of the <26>^Al creation cascade, is quite important. In our present study with gamma-ray spectroscopy, we newly observed one level at 5889-keV in the <26>^Si. Spin parity of this level is determined as 0^+ by our angular correlation measurements.

Research Products

• [Journal Article] Nuclear Clusters in Astrophysics (2010)
  • Author(s): S. Kubono, Dam N. Binh, S. Hayakawa, H. Hashimoto, D. Kahl, Y. Wakabayashi, H. Yamaguchi, T. Teranishi, N. Iwasa, T. Komatsubara, S. Kato, Le H. Khiem
  • Journal Title: Nucl. Phys. A Volume: 834 Pages: 647c-650c
  • DOI: DOI:10.1016/j.nuclphysa.2010.01.113
  • Peer Reviewed
• [Journal Article] Direct measurement of the <14>^O(α, α)<14>^O cross section for astrophysical lyimportant <14>^O+α resonances (2010)
  • Author(s): A. Kim, N.H. Lee, I.S. Hahn, J.S. Yoo, M.H. Han, S. Kubono, H. Yamaguchi, S.Hayakawa, Y. Wakabayashi, D. Binh, H. Hashimoto, T. Kawabata, D. Kahl, Y.Kurihara, Y.K. Kwon, T. Teranishi, S. Kato, T. Komatsubara, B. Guo, G. Bing, W. Liu, Y. Wang
  • Journal Title: Journal ofthe Korean Physical Society Volume: Vol.57, No.1 Pages: 40-43
  • DOI: DOI:10.3938/jkps.57.40
  • Peer Reviewed
• [Journal Article] Plasmonic activity on gold nanoparticles embedded innanopores formed in a surface layer ofsilica glass by swift-heavy-ionirradiation (2009)
  • Author(s): K. Nomura, Y. Ohki, M. Fujimaki, X. Wang, K. Awazu, T. Komatsubara
  • Journal Title: Nanotechnology Volume: Vol.20 Num.47 Pages: 475306
  • DOI: DOI:10.1088/0957-4484/20/47/475306
  • Peer Reviewed
• [Journal Article] The fabrication of aligned pairsof gold nanorods in SiO_2 films byion irradiation (2009)
  • Author(s): K. Awazu, X. Wang, T. Komatsubara, J. Watanabe, Y. Matsumoto, S. Warisawa, S.Ishihara
  • Journal Title: Nanotechnology Volume: 20 Pages: 325303
  • DOI: DOI:10.1088/0957-4484/20/32/325303
  • Peer Reviewed
• [Journal Article] Spinand parities of astrophysically important 30S states from <28>^Si(3^He, nγ)<30>^S
  • Author(s): K. Setoodehnia, A.A. Chen, T.Komatsubara, S. Kubono, D.N. Binh, J.F.Carpino, J. Chen, T. Hashimoto, T. Hayakawa, Y. Ishibashi, Y. Ito, D. Kahl, T. Moriguchi, H. Ooishi, A. Ozawa, T. Shizuma, Y. Sugiyama, H. Yamaguchi
  • Journal Title: PhysicalReview C83
  • DOI: DOI:10.1103/PhysRevC.83.018803
  • Peer Reviewed
• [Presentation] <26>^Si励起状態の角分布、角相関測定 (2012)
  • Author(s): 小松原哲郎
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 20120324-27
• [Presentation] 1Mタンデトロンによる宇宙核物理 (2012)
  • Author(s): 小松原哲郎
  • Organizer: 筑波大学複合タンデム加速器施設の新展開-タンデム加速器更新計画と今後の研究展望
  • Place of Presentation: 筑波大学
  • Year and Date: 2012-03-29
• [Presentation] Astrophysicalstudies by means of gamma-ray spectroscopy (2010)
  • Author(s): Tetsuro Komatsubara
  • Organizer: The 10th International Symposium on Origin of Matter and Evolution of Galaxies
  • Place of Presentation: University of Osaka
  • Year and Date: 20100308-10
• [Presentation] ガンマ線分光による宇宙核物理学の研究 (2010)
  • Author(s): 小松原哲郎
  • Organizer: 高度制御量子ビーム応用研究創出事業研究成果報告会
  • Place of Presentation: 筑波大学
  • Year and Date: 2010-03-15
• [Remarks]
  • URL: http://www.tac.tsukuba.ac.jp/~komatsu