2018 Fiscal Year Final Research Report
Development of gamma-ray linear polarization measurement system in order to determine spins and parities of nuclear excited levels
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 |
Section | 一般 |
Research Field |
Nuclear engineering
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Research Institution | Nagoya University |
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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Keywords | 崩壊核分光 / 直線偏光 / 不安定核 |
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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Free Research Field |
応用原子核物理学
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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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