| Project/Area Number |
24340056
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Kyushu University |
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Principal Investigator |
SAGARA Kenshi 九州大学, 理学(系)研究科(研究院), 名誉教授 (00128026)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Kunihiro 九州大学, 大学院理学研究院, 助教 (60532364)
TERANISHI Takashi 九州大学, 大学院理学研究院, 準教授 (10323495)
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| Co-Investigator(Renkei-kenkyūsha) |
MORITA Kousuke 九州大学, 大学院理学研究院, 教授 (20250110)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2014: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2012: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
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| Keywords | 天体ヘリウム燃焼 / タンデム加速器改造 / 極微量粒子検出 / 極低バックグランド測定 / 窓無し気体標的 / 金箔皮膜 / C+α核融合 / 極微小断面積測定 / 極低バックグランド / 炭素ーヘリウム核融合 / 全断面積直接測定 / 天体核反応 / ヘリウム燃焼 / イオンチェンバー / 加速減速運転 |
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| Outline of Final Research Achievements |
In the sun 4He is being made from 4 protons. That is Hydrogen burning. In heavier stars, heavy elements up to Uranium are being made in succeeding processes of Hydrogen burning → Helium burning → Carbon and Oxygen burning → …. These processes can be simulated using many nuclear reaction rates. However, a basically important reaction rate of 4He+12C → 16O+gamma in Helium burning has not been measured yet in spite of experiments in half century in the world. The measurement is extremely difficult due to special nuclear reaction mechanism.
In our present study, we measured very small 4He+12C → 16O+gamma rate near stellar energy by remodeling the tandem-accelerator at Kyushu Univ. and developing new instruments and methods based on our original ideas. We succeeded in measuring the reaction rate 1.5 orders of magnitude smaller than the previous world record. The final goal can be achieved by progressing further 2.5 orders of magnitude.
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