Cosmogenic 53Mn in Antarctic Meteorites and Their Exposure History
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概要
- 論文の詳細を見る
Our previous studies on cosmic ray produced radio-nuclides in antarctic meteorites were extended to 13 additional antarctic meteorites in order to obtain information on the cosmic ray exposure history of these meteorites. The ^<53>(Mn) activities in these meteorites are all close to the saturation value which indicates exposure ages longer than 4 million years. The effect of weathering on the ^<53>(Mn) content was investigated in two oxidized meteorites, Yamato-7301 and Allan Hills-76008. These meteorites have been shown by our previous works to have experienced two-stage irradiations in space. The ^<53>(Mn) contents in the metal phases agreed within the error with those in the non-magnetic phases which contained high concentrations of oxidized Fe of metallic origin, and also with the values for bulk samples previously reported. The effect is clearly shown of minor significance. The data on spallogenic nuclides so far obtained for these two meteorites are summarized and discussed in light of a two-stage irradiation history.
- 国立極地研究所の論文
著者
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Imamura Mineo
Institute for Nuclear Study, University of Tokyo
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Imamura Mineo
Institute For Nuclear Study University Of Tokyo
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Honda Masatake
The Institute For Solid State Physics University Of Tokyo
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Nishiizumi Kunihiko
Department of Chemistry, B-017, University of California
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Nishiizumi Kunihiko
Department Of Chemistry B-017 University Of California
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