| Project/Area Number |
24740183
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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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 Institute of Physical and Chemical Research |
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Principal Investigator |
TSUCHIYA Harufumi 独立行政法人理化学研究所, 仁科加速器研究センター, 客員研究員 (70415230)
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| Research Collaborator |
ENOTO Teruaki 独立行政法人理化学研究所, 仁科加速器研究センター, 訪問研究員 (20748123)
UMEMOTO Daigo 東京大学, 大学院理学系研究科, D2
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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 |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 粒子加速 / 雷 / 雷雲 / ガンマ線 / ガンマ線測定 / 放射線観測 / ガンマ線観測 / 宇宙線 |
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| Outline of Final Research Achievements |
Gamma rays derived from winter thunderstorms have been observed at the coastal area of the Japan Sea. Gamma-Ray Observations of Winter Thunderclouds (GROWTH) experiment has successfully operated gamma-ray measurement at the Kashiwazaki-Kariwa nuclear power plant, revealing that lightning and thunderclouds can accelerate electrons to 10 MeV or higher. The present study installed a new detector consisting of BGO scintillators, increased the number of gamma-ray events to be detected. In addition, GROWTH for the first time observed 511 keV annihilation lines lasting around 60 s, implying that thunderclouds may produce a large flux of positrons.
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