Cosmogenic 53Mn Survey of Yamato Meteorites
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概要
- 論文の詳細を見る
As part of a program to compile statistical information on the cosmic ray exposure history of meteorites, cosmogenic ^<53>(Mn) (t_<1/2>=3.7×(10)^6y) was determined in twenty-one Yamato meteorites. Yamato-74116 and -74193 contain especially low amounts of ^<53>(Mn) suggesting short cosmic ray exposure ages. The ^<53>(Mn) activity level of Yamato-74192 is 578±24 dpm/kg (Fe+1/3 Ni) which is the highest value we have ever measured in a chondrite to date. Although the recovered mass of Yamato-74159 was small, its ^<53>(Mn) content indicates a large preatmospheric mass. Two histograms, which illustrate the frequencies of the ^<53>(Mn) contents of chondrites from Antarctica and those of chondrites from other parts of the world, show similar statistical distributions. This indicates that the terrestrial ages of Antarctic meteorites are generally short (<1 my) in comparison to the ^<53>Mn half-life.
- 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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Honda Masatake
Institute For Solid State Physics University Of Tokyo
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Nishizumi Kunihiko
Department of Chemistry, B-017, University of California
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Murrell Michael
Department of Chemistry, B-017, University of California
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Arnold James
Department of Chemistry, B-017, University of California
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Arnold James
Department Of Chemistry B-017 University Of California
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Murrell Michael
Department Of Chemistry B-017 University Of California
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Nishizumi Kunihiko
Department Of Chemistry B-017 University Of California
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