| Project/Area Number |
23654080
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Research Collaborator |
TOKANAI Fuyuki 山形大学, 理学部, 教授 (80323161)
HORIUCHI Kazuho 弘前大学, 理工学研究科, 助教 (00344614)
YOKOYAMA Yusuke 東京大学, 大気海洋研究所, 准教授 (10359648)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 宇宙線 / 太陽活動 / 宇宙線生成核種 / 炭素 14 / 宇宙気候学 / 太陽圏 / 樹木年輪 / 炭素14 / 気候変動 / マウンダー極小期 / 加速器質量分析計 |
|---|
| Research Abstract |
We have conducted multiply-repeated measurements of radiocarbon content in annually separated tree rings using the Accelerator Mass Spectrometer at Yamagata University, in order to improve the precision of radiocarbon measurement and to determine the absolute ages of annual-scale GCR events during the Maunder Minimum. We have successfully achieved four times higher precision.
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