| Project/Area Number |
19540516
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | National Museum of Nature and Science, Tokyo |
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Principal Investigator |
YONEDA Shigekazu National Museum of Nature and Science, Tokyo, 理工学研究部, 研究主幹 (60210788)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 消滅核種 / セシウム / バリウム / 同位体 / 隕石 / 狭山隕石 / コンドルール / セシウム-135 / Cs-135 |
|---|
| Research Abstract |
The barium isotonic compositions of carbonaceous chondrites, which formed in the early solar system, were analyzed and the evidence of the extinct nuclide Cs-135, a nuclide which had decayed out due to its short half-life, were found. Cesium is one of the alkaline metal elements. Especially, those from chondrules of the Sayama meteorite, one of the heavily altered carbonaceous chondrites by aqueous alteration, have large isotopic anomaly. The obtained data may not account for the time of formation but may be explained by mixing at the aqueous alteration in the early solar system.
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