2014 Fiscal Year Final Research Report
Electron-capture decay rate of 7Be encapsulated in fullerene cages
| Project/Area Number |
23600001
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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 |
Quantum beam science
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| Research Institution | Kyoto University (2013-2014)
Tohoku University (2011-2012) |
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Principal Investigator |
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Keywords | 半減期 / 放射性ベリリウム / フラーレン / 自動測定 / 崩壊定数 / 放射性金属ベリリウム |
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| Outline of Final Research Achievements |
The decay rate of Be-7 electron capture (EC) was measured in C60 and C70 and Be metal with a reference method. The half-life of 7Be endohedral C60, C70 (7Be@C60,C70) was found to be 52.49±0.04 days for He temperature. These values are almost 1.5% shorter than that of Be-7 in Be metal at room temperature. The result is a reflection of the different electron wave-functions for Be-7 inside C60, C70 compared to when Be-7 is in Be metal. The magnitude of the average charge-transfer from the L(2s) electrons of the Be-7 atom play an important role in such variation in the decay constant in the environments.
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| Free Research Field |
放射化学
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