@article{oai:nipr.repo.nii.ac.jp:00000888,
 author = {Takaoka, Nobuo and Nagao, Keisuke},
 journal = {Memoirs of National Institute of Polar Research. Special issue},
 month = {Feb},
 note = {P(論文), 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).},
 pages = {198--208},
 title = {Rare Gas Studies of Yamato-7301(j), -7304(m) and -7305(k)},
 volume = {8},
 year = {1978}
}