@article{oai:nipr.repo.nii.ac.jp:00005998,
 author = {Matsumoto,Yoshiki and Matsumoto,Takuya and Matsuda,Jun-ichi and Nakamura,Noboru},
 journal = {Antarctic meteorite research},
 month = {Mar},
 note = {P(論文), We have investigated elemental and isotopic compositions of noble gases in the newly-fallen CK chondrite, Kobe. The relatively low concentrations of primordial heavy noble gases (Kr and Xe) and the relatively high ^<129>Xe/^<132>Xe ratio (6.51±0.02) are similar to those found in previous studies of CK chondrites. The calculated cosmic-ray exposure age based on cosmogenic ^<21>Ne is 41Ma, and the K-Ar age is 2.1Ga. Based on calculated exposure ages and gas retention ages of Kobe and some other CK chondrites, it is likely that they have partially lost both radiogenic and cosmogenic He by solar heating during the time of exposure. Based on the ^<40>Ar retention age, we interpret that Kobe may also have experienced thermal events, possibly related to impacts about 2 billion years age.},
 pages = {61--70},
 title = {A preliminary report on noble gases in the Kobe (CK) meteorite: A carbonaceous chondrite fell in Kobe City, Japan},
 volume = {14},
 year = {2001}
}