Barium Isotopes in Chondritic Meteorites: Implications for Planetary Reservoir Models

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Science  03 Nov 2006:
Vol. 314, Issue 5800, pp. 809-812
DOI: 10.1126/science.1132595

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High-precision barium isotope measurements yielded differences of up to 25 parts per million in the 137Ba/136Ba ratio and 60 parts per million in the 138Ba/136Ba ratio between chondrites and Earth. These differences probably arose from incomplete mixing of nucleosynthetic material in the solar nebula. Chondritic meteorites have a slight excess of supernova-derived material as compared to Earth, demonstrating that the solar nebula was not perfectly homogenized upon formation.

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