Direct measurement of 12C-4He nuclear fusion cross section at stars

2010 Fiscal Year Final Research Report

• Project/Area Number: 20340056
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyushu University
• Principal Investigator: SAGARA Kenshui Kyushu University, 大学院・理学研究院, 教授 (00128026)
• Co-Investigator(Kenkyū-buntansha): TERANISHI Takashi 九州大学, 大学院・理学研究院, 准教授 (10323495) ; IKEDA Nobuo 九州大学, 大学院・工学研究院, 教授 (70193208) ; HASHIMOTO Masaaki 九州大学, 大学院・理学研究院, 教授 (20228422)
• Project Period (FY): 2008 – 2010
• Keywords: 天体ヘリウム燃焼 / 炭素-ヘリウム核融合 / 断面積測定 / 星の進化 / 膜無し気体標的 / タンデム加速器 / 極低バックグランド

Research Abstract

To simulate evolution of stars, Carbon-Helium nuclear fusion rate at low energy of Ecm=3MeV is essentially important. But measurement of the rate is very difficult, and no one has succeeded in it. In our present study, we developed a windowless Helium gas target of the highest thickness in the world, reduced backgrounds to a level of 10^<-15> lower than Carbon beam particles, and measured Carbon-Helium fusion rate at Ecm=1.5 MeV, the lowest in the world. We also prepared for measurements of the fusion rate down to 0.7 MeV, to estimate the fusion rate at 0.3 MeV by extrapolation.

Research Products

• [Journal Article] Direct measurement of ^4He(^<12>C, ^<16>O)γ reaction near stellar energy (2010)
  • Author(s): K.Fujita, K.Sagara, T.Teranishi, T.Goto, R.Iwabuchi, S.Matsuda, N.Oba, M.Taniguchi, H.Yamaguchi
  • Journal Title: AIP Conference Proceedings Volume 1269 Pages: 289-295
  • Peer Reviewed
• [Journal Article] Background Reduction System for ^4He(^<12>C, ^<16>O)γ at KUTL (2010)
  • Author(s): M.Taniguchi, K.Sagara, T.Teranishi, K.Fujita, R.Iwabuchi, T.Goto, K.Nakano, N.Oba
  • Journal Title: AIP Conference Proceedings Volume 1238 Pages: 208-210
  • Peer Reviewed
• [Journal Article] Direct Measurement of ^4He(^<12>C, ^<16>O)γ Reaction at KUTL (2010)
  • Author(s): K.Fujita, K.Sagara, T.Teranishi, T.Goto, R.Iwabuchi, S.Matsuda, K.Nakano, N.Oba,M.Taniguchi, H.Yamaguchi
  • Journal Title: AIP Conference Proceedings Volume 1238 Pages: 211-213
  • Peer Reviewed
• [Journal Article] 九大タンデムにおけるビームバンチャー改良 (2009)
  • Author(s): 藤田訓裕、相良建至、後藤昴、中野桂樹、岩淵利恵、谷口雅弘、大場希美、前田豊和
  • Journal Title: 第22回タンデム加速器及びその周辺技術の研究会報告集 Pages: 69-72
• [Journal Article] A blow-in type windowless gas target for astro-nuclear experiments (2008)
  • Author(s): K.Sagara, S.Kamibeppu, H.Oba, H.Tanimoto, Y.Akama, M.Taniguchi
  • Journal Title: Nuclear Instruments and Methods A 590 Pages: 194-197
  • Peer Reviewed
• [Presentation] Ecm=1.5MeVでの4He+12C→16O+γ天体核反応測定～BG除去～ (2010)
  • Author(s): 山口祐幸、相良建至、寺西高、藤田訓裕、谷口雅彦、岩淵利恵、大場希美、松田沙矢香
  • Organizer: 第116回日本物理学会九州支部例会
  • Place of Presentation: 長崎大学
  • Year and Date: 20101200
• [Presentation] 天体核実験用の窓無なしガス標的とガス循環系の開発 (2010)
  • Author(s): 松田沙矢香、相良建至、寺西高、藤田訓裕、谷口雅彦、岩淵利恵、大場希美、山口祐幸
  • Organizer: 第116回日本物理学会九州支部例会
  • Place of Presentation: 長崎大学
  • Year and Date: 20101200
• [Presentation] タンデム加速器の加速減速強集束運転法 (2010)
  • Author(s): Maria Theodora Rosary、相良建至、寺西高、藤田訓裕、谷口雅彦、大場希美、松田沙矢香、山口祐幸
  • Organizer: 第116回日本物理学会九州支部例会
  • Place of Presentation: 長崎大学
  • Year and Date: 20101200
• [Presentation] Measurement of 4He(12C,16O)γnear Stellar Energy by Inverse Kinematics (2010)
  • Author(s): K.Fujita, K.Sagara, T.Teranishi, R.Iwasaki, S.Matsuda, T.Mitsuzumi, N.Oba, M.Taniguchi, H.Yamaguchi
  • Organizer: Korea Japan Exchange Session at KPS meeting
  • Place of Presentation: Phoenix park, Pyeong Chang, Korea
  • Year and Date: 20101020-20101022
• [Presentation] Direct measurement of ^<12>C+^4CHe fusion cross section near stellar energy (2010)
  • Author(s): 相良建至, 藤田訓裕, 寺西高, 谷口雅彦, 大場希美, 山口祐幸, 松田沙矢香
  • Organizer: 21th European Conference on Few-Body Problems in Physics
  • Place of Presentation: Salamanca, Spain
  • Year and Date: 20100830-20100903
• [Presentation] Direct measurement of the 4He(12C,16O)γ cross section near stellar energy (2010)
  • Author(s): 藤田訓裕, 相良建至, 寺西高, 後藤昴, 岩淵利恵, 松田沙矢香, 中野桂樹, 大場希美, 谷口雅彦, 山口祐幸
  • Organizer: 11th Symposium on Nuclei in the Cosmos (NIC XI)
  • Place of Presentation: Heidelberg
  • Year and Date: 20100719-20100723
• [Presentation] Direct measurement of ^4He+^<12>C fusion cross section at E_<cm>=1.5MeV at KUTL (2010)
  • Author(s): 相良建至, 藤田訓裕, 寺西高, 谷口雅彦, 大場希美, 後藤昴, 岩淵利恵, 松田沙矢香, 山口祐幸
  • Organizer: International Nuclear Physics Conference 2010 (INPC2010)
  • Place of Presentation: Vancouver, Canada
  • Year and Date: 20100705-20100709
• [Presentation] Direct measurement of 4He(12C,16O)γ reaction near stellar energy (2010)
  • Author(s): K.Fujita, K.Sagara, T.Teranishi, T.Goto, R.Iwabuchi, S.Matsuda, K.Nakano, N.Oba, M.Taniguchi, H.Yamaguchi
  • Organizer: The 10th.International Symposium on Origin of Matter and Evolution of the Galaxies (OMEG10)
  • Place of Presentation: RCNP, Osaka University, Ibaraki, Osaka, Japan.
  • Year and Date: 20100508-20100510
• [Presentation] 天体核実験のための厚い膜無しヘリウムガス標的(0.1気圧・cm)の開発と性能 (2010)
  • Author(s): 大場希美、相良建至、藤田訓祐、岩淵利恵、後藤昂、谷口雅彦、松田沙矢香、山口裕幸、田中薫、寺西高
  • Organizer: 第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 20100300
• [Presentation] C+α天体核反応全断面積のEcm=1.5-1.15MeVでの測定 (2010)
  • Author(s): 相良建至, 藤田訓裕, 谷口雅彦, 岩淵利恵, 後藤昂, 大場希美, 松田沙矢香, 山口祐幸, 田中薫, 寺西高
  • Organizer: 第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 20100300
• [Presentation] Direct measurement of c+alpha fusion cross section at Ecm=2.4-1.5MeV at KUTL (2010)
  • Author(s): 相良建至
  • Organizer: 宇宙核物理第3回OMEG(Origin of Matter nad Evolution of Galaxies) Instituteセミナー
  • Place of Presentation: 理化学研究所
  • Year and Date: 2010-11-01
• [Presentation] 天体核実験のための膜なしHe標的の圧力分布と厚さ測定 (2009)
  • Author(s): 大場希美, 相良建至, 寺西高, 藤田訓裕, 谷雅彦, 岩淵利恵, 後藤昴, 中野桂樹
  • Organizer: 第115回日本物理学会九州支部例会
  • Place of Presentation: 宮崎大学
  • Year and Date: 20091200
• [Presentation] Ecm=1.5MeVでの4He+12C→16O+γ断面積測定:BG低減 (2009)
  • Author(s): 後藤昂, 相良建至, 寺西高, 藤田訓裕, 谷口雅彦, 岩淵利恵, 中野桂樹, 大場希美, 田中薫, 松田沙矢香, 山口裕幸
  • Organizer: 第115回日本物理学会九州支部例会
  • Place of Presentation: 宮崎大学
  • Year and Date: 20091200
• [Presentation] Background reduction system for 4He(12C, 16O)γ measurement at KUTL (2009)
  • Author(s): 谷口雅彦, 相良建至, 藤田訓裕, 後藤昂, 岩淵利恵, 中野桂樹, 大場希美, 寺西高
  • Organizer: VII TOURS Symposium on Nuclear Physics and Astrophysics
  • Place of Presentation: Kobe, JAPAN.
  • Year and Date: 20091116-20091120
• [Presentation] Direct measurement of 4He(12C, 16O)γ reaction at KUTL (2009)
  • Author(s): 藤田訓裕, 相良建至, 後藤昂, 岩淵利恵, 中野桂樹, 大場希美, 谷口雅彦, 寺西高
  • Organizer: VII TOURS Symposium on Nuclear Physics and Astrophysics
  • Place of Presentation: Kobe, JAPAN.
  • Year and Date: 20091116-20091120
• [Presentation] Performance of a thick windowless He gas target at KUTL (2009)
  • Author(s): 岩淵利恵, 相良建至, 藤田訓裕, 寺西高, 谷口雅彦, 後藤昂, 中野桂樹, 大場希美, 松田沙矢香, 山口裕幸
  • Organizer: 3rd Joint Meeting of the Nuclear Physics Divisions of the APS and JPS
  • Place of Presentation: Hawaii.
  • Year and Date: 20091000
• [Presentation] Present Status of direct ^4He(^<12>C,^<16>O)γ measurement near stellar energy at KUTL (2009)
  • Author(s): 藤田訓裕, 相良建至, 寺西高, 後藤昂, 岩淵利恵, 松田沙矢香, 中野桂樹, 大場希美, 谷口雅彦, 山口裕幸
  • Organizer: 3rd Joint Meeting of the Nuclear Physics Divisions of the APS and JPS
  • Place of Presentation: Hawaii.
  • Year and Date: 20091000
• [Presentation] 九大タンデムにおけるビーム・バンチャー改良 (2009)
  • Author(s): 藤田訓裕, 相良建至, 後藤昂, 中野桂樹, 岩淵利恵, 谷口雅弘, 大場希美, 前田豊和
  • Organizer: 第22回タンデム加速器およびその周辺技術の研究会
  • Place of Presentation: 筑波大学
  • Year and Date: 20090700
• [Presentation] A windowless He-gas target for astrophysics experiments (2009)
  • Author(s): 松田沙矢香, 相良建至, 寺西高, 藤田訓裕, 岩淵利恵, 谷口雅彦, 後藤昂, 中野桂樹, 大場希美, 山口裕幸
  • Organizer: 3rd Joint Meeting of the Nuclear Physics Divisions of the APS and JPS
  • Place of Presentation: Hawaii.
  • Year and Date: 2009-10-01
• [Presentation] 天体核実験のための膜なしHe標的の最終型と性能 (2008)
  • Author(s): 岩淵利恵, 藤田訓裕, 相良建至, 五百木崇博, 後藤昂, 中野桂樹, 谷口雅彦, 寺西高
  • Organizer: 第114回日本物理学会九州支部例会
  • Place of Presentation: 福岡工業大学
  • Year and Date: 20081200
• [Presentation] 九大における天体ヘリウム-炭素反応速度測定の現状 (2008)
  • Author(s): 相良建至, 寺西高, 藤田訓裕, 谷口雅彦, 五百木崇博, 中野桂樹, 後藤昂, 岩淵利恵, 前田豊和, 二宮重史
  • Organizer: 第114回日本物理学会九州支部例会
  • Place of Presentation: 福岡工業大学
  • Year and Date: 20081200
• [Remarks] ホームページ等
  • URL: http://ne.phys.kyushu-u.ac.jp/html/astro.html