Live Iron-60 in the Early Solar System
Live Iron-60 in the Early Solar System
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DOI：
10.1126/science.259.5098.1138
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发表时间：
1993-02
期刊：
影响因子：
56.9
通讯作者：
A. Shukolyukov;G. Lugmair
中科院分区：
文献类型：
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作者：
A. Shukolyukov;G. Lugmair
差异化陨石Chervony Kut样品中镍的同位素分析显示，60Ni的相对过量从2.4到50ppm不等。这些同位素过剩来自现已灭绝的短命核素60Fe的衰变，并为早期太阳系大范围存在60Fe提供了明确的证据。~(60)Fe不仅在切尔沃尼-库特母体熔融和分异(即Fe-Ni分馏)时存在，而且在晚些时候玄武岩岩浆在小行星表面或附近固化时也存在。据推测，60Fe的丰度表明，它的衰变本身就可以提供足够的热量，在小型(直径数百公里)的行星体吸积后不久融化它们。
Isotopic analyses of nickel in samples from the differentiated meteorite Chervony Kut revealed the presence of relative excesses of 60Ni ranging from 2.4 up to 50 parts per 104. These isotopic excesses are from the decay of the now extinct short-lived nuclide 60Fe and provide clear evidence for the existence of 60Fe over large scales in the early solar system. Not only was 60Fe present at the time of melting and differentiation (that is, Fe-Ni fractionation) of the parent body of Chervony Kut but also later at the time when basaltic magma solidified at or near the surface of the planetesimal. The inferred abundance of 60Fe suggests that its decay alone could have provided sufficient heat to melt small (diameters of several hundred kilometers) planetary bodies shortly after their accretion.