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Title:
Origin of uranium isotope variations in early solar nebula condensates
Authors:
Tissot, F. L. H.; Dauphas, N.; Grossman, L.
Publication:
Science Advances, vol. 2, issue 3, pp. e1501400-e1501400
Publication Date:
03/2016
Origin:
CROSSREF
DOI:
10.1126/sciadv.1501400
Bibliographic Code:
2016SciA....2E1400T

Abstract

High temperature condensates found in meteorites display uranium isotopic variations (235U/238U) that complicate dating of the formation of the Solar System and whose origin remains mysterious. It is possible that these variations are due to decay of the short-lived radionuclide 247Cm (t1/2=15.6 Myr) into 235U but they could also be due to uranium kinetic isotopic fractionation during condensation. We report uranium isotope measurements of meteoritic refractory inclusions that reveal excesses of 235U reaching ~+6 % relative to average solar system composition, which can only be due to decay of 247Cm. This allows us to constrain the 247Cm/235U ratio at Solar System formation to (7.0 +- 1.6) x 10-5. This value provides new clues on the universality of nucleosynthetic r-process of rapid neutron capture.
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Physics
arXiv e-prints