| Project/Area Number |
16K06957
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
Kojima Yasuaki 名古屋大学, アイソトープ総合センター, 准教授 (80314730)
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| Research Collaborator |
Shibata Michihiro
Taniguchi Akihiro
Ohno Shingo
Kamada Hiroki
Yamashita Takahiro
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 崩壊核分光 / 直線偏光 / 不安定核 / γ線 / 核データ / 核分光 / 放射線 / 実験核物理 |
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| Outline of Final Research Achievements |
The aim of this research is determination of spins and parities of excited levels in short-lived beta-decaying nuclei by means of gamma-ray linear polarization measurements. In the first stage, we searched the optimum geometrical condition using standard radioactive sources of Co-60, Cs-134 and Eu-152. The best sensitivity was obtained when detectors were placed at 10cm from the source position. Next, we performed an on-line experiment for La-146 (half-life of 6 s) at KUR-ISOL (Kyoto University Reactor, Isotope Separator On-Line). In this experiment, we observed asymmetry of Compton scattering events. This means that gamma-ray linear polarization was found for short-lived nuclei.
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| Academic Significance and Societal Importance of the Research Achievements |
大型のクローバ検出器等を使い，その配置を最適化することで，短寿命の不安定原子核から放出されるγ線に対して直線偏光度の測定が可能であることを実証した．このことにより，不安定核の原子核構造を議論する際に不可欠な励起準位のスピン・パリティを実験的に決定できる．
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