Origin of uranium isotope variations in early solar nebula condensates.
作者： François L. H. Tissot , Nicolas Dauphas , Lawrence Grossman
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摘要: High-temperature condensates found in meteorites display uranium isotopic variations (235U/238U), which complicate dating the solar system’s formation and whose origin remains mysterious. It is possible that these are due to decay of short-lived radionuclide 247Cm (t1/2 = 15.6 My) into 235U, but they could also be kinetic fractionation during condensation. We report isotope measurements meteoritic refractory inclusions reveal excesses 235U reaching ~+6% relative average system composition, can only 247Cm. This allows us constrain 247Cm/235U ratio at (1.1 ± 0.3) × 10−4. value provides new clues on universality nucleosynthetic r-process rapid neutron capture.
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Alastair Graham Walter Cameron, Stellar Evolution, Nuclear Astrophysics, and Nucleogenesis ,(2013)
Earth processes : reading the isotopic code Washington DC American Geophysical Union Geophysical Monograph Series. ,vol. 95, ,(1996) , 10.1029/GM095
François L.H. Tissot, Nicolas Dauphas, Uranium isotopic compositions of the crust and ocean: Age corrections, U budget and global extent of modern anoxia Geochimica et Cosmochimica Acta. ,vol. 167, pp. 113- 143 ,(2015) , 10.1016/J.GCA.2015.06.034
Nicolas Dauphas, Larry R. Nittler, Meteorites and the Chemical Evolution of the Milky Way mess. pp. 127- ,(2005)
T. Shimamura, M. Tatsumoto, Evidence for live Cm-247 in the early solar system ,(1980)
A. N. Krot, E. R. D. Scott, M. E. Zolensky, Workshop on Parent-Body and Nebular Modification of Chondritic Materials ,(1997)
John H. Jones, The geochemical coherence of Pu and Nd and the Pu-244/U-238 ratio of the early solar system Geochimica et Cosmochimica Acta. ,vol. 46, pp. 1793- 1804 ,(1982) , 10.1016/0016-7037(82)90118-1
Bradley S. Meyer, Donald D. Clayton, Short-Lived Radioactivities and the Birth of the Sun Space Science Reviews. ,vol. 92, pp. 133- 152 ,(2000) , 10.1023/A:1005282825778
Y.‐Z. Qian, P. Vogel, G. J. Wasserburg, Diverse supernova sources for the r-process The Astrophysical Journal. ,vol. 494, pp. 285- 296 ,(1998) , 10.1086/305198
Alexander N. Krot, Kazuhide Nagashima, Gerald J. Wasserburg, Gary R. Huss, Dimitri Papanastassiou, Andrew M. Davis, Ian D. Hutcheon, Martin Bizzarro, Calcium-aluminum-rich inclusions with fractionation and unknown nuclear effects (FUN CAIs): I. Mineralogy, petrology, and oxygen isotopic compositions Geochimica et Cosmochimica Acta. ,vol. 145, pp. 206- 247 ,(2014) , 10.1016/J.GCA.2014.09.027