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Published Online October 5, 2006
Science DOI: 10.1126/science.1131708

Reports

Submitted on June 23, 2006
Accepted on September 19, 2006

Solar Nebula Heterogeneity in p-Process Samarium and Neodymium Isotopes

Rasmus Andreasen 1 and Mukul Sharma 1*

1 Radiogenic Isotope Geochemistry Laboratory, Department of Earth Sciences, Dartmouth College, 6105 Sherman Fairchild Hall, Hanover, NH 03755, USA.

* To whom correspondence should be addressed.
Mukul Sharma , E-mail: mukul.sharma{at}dartmouth.edu

Bulk carbonaceous chondrites display a deficit of ~100 ppm in 144Sm with respect to other meteorites and terrestrial standards leading to a decrease in their 142Nd/144Nd ratios by ~11 ppm. The data require that Sm and Nd isotopes produced by the p-process associated with photodisintegration reactions in supernovae were heterogeneously distributed in the Solar Nebula. Other Sm and Nd isotopes produced by rapid neutron capture (r-process) in supernovae and by slow neutron capture (s-process) in red giants were homogeneously distributed. The supernovae sources supplying the p- and r-process nuclides to Solar Nebula were thus disconnected, or only weakly connected.


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