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    National Tsing Hua University Institutional Repository > 歷任校長 > 沈君山 (1994-1997) > 期刊論文 >  Ca-48 HETEROGENEITY IN DIFFERENTIATED METEORITES


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80887


    Title: Ca-48 HETEROGENEITY IN DIFFERENTIATED METEORITES
    Authors: Chen, H.-W.;Lee, T.;Lee, D.-C.;Shen, J. J-S.;Chen, J.-C.
    教師: 沈君山
    Date: 2011
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL LETTERS, American Astronomical Society, Volume 743, Issue 1, DEC 10 2011, Article Number L23
    Keywords: meteorites
    meteors
    meteoroids
    nuclear reactions
    nucleosynthesis
    abundances
    Abstract: Isotopic heterogeneities of Ca-48 have been found in numerous bulk meteorites that are correlated with Ti-50 and Cr-54 anomalies among differentiated planetary bodies, and the results suggest that a rare subset of neutron-rich Type Ia supernova (nSN Ia) was responsible for contributing these neutron-rich iron-group isotopes into the solar system (SS). The heterogeneity of these isotopes found in differentiated meteorites indicates that the isotopic compositions of the bulk SS are not uniform, and there are significant amounts of nSNe Ia dust incompletely mixed with the rest of SS materials during planetary formation. Combined with the data of now-extinct short-lived nuclide Fe-60, which can be produced more efficiently from an nSN Ia than a Type II supernova ejecta, the observed planetary-scale isotopic heterogeneity probably reflects a late input of stellar dust grains with neutron-rich nuclear statistical equilibrium nuclides into the early SS.
    Relation Link: http://aas.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80887
    Appears in Collections:[沈君山 (1994-1997)] 期刊論文
    [物理系] 期刊論文

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