Rare Gas Studies of Yamato-7301(j), -7304(m) and -7305(k)
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概要
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Yamato-7301 (H4 chondrite) and Yamato-7304 and -7305 (both L5 chondrites) were investigated for concentrations and isotopic compositions of rare gases. From the data of isotopic analyses of rare gases, cosmic-ray exposure ages on cosmogenic ^3(He), ^<21>(Ne) and ^<38>(Ar) and gas-retention ages on radiogenic ^4(He) and ^<40>(Ar) were calculated as follows : [table] Partial loss of helium was suggested for three samples. There were definitely observed ^<129>Xe-excesses and systematic enrichment in the light isotopes of xenon in all three meteorites. Isotopic anomalies were observed in the heavy isotopes of xenon in Yamato-7304 and the excess pattern resembles the fission yield pattern of ^<244>(Pu).
- 国立極地研究所の論文
著者
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Takaoka Nobuo
Department Of Earth And Planetary Science Faculty Of Science Kyushu University
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Nagao Keisuke
Department Of Applied Physics Faculty Of Science Okayama University Of Science
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Nagao Keisuke
Department Of Physics Faculty Of Science Osaka University
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