Research on behaviors of the alkaline metal elements in the early solar system by the extinct nuclides chronology

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The barium isotonic compositions of carbonaceous chondrites, which formed in the early solar system, were analyzed and the evidence of the extinct nuclide Cs-135, a nuclide which had decayed out due to its short half-life, were found. Cesium is one of the alkaline metal elements. Especially, those from chondrules of the Sayama meteorite, one of the heavily altered carbonaceous chondrites by aqueous alteration, have large isotopic anomaly. The obtained data may not account for the time of formation but may be explained by mixing at the aqueous alteration in the early solar system.