Physics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..77d5803d&link_type=abstract
Physical Review C, vol. 77, Issue 4, id. 045803
Physics
2
Scientific paper
An important constraint in developing models of p-process nucleosynthesis is that the abundances of many of the p-process nuclides are not well known. A recent review of the p-process has identified six p-process nuclides that are of particular significance to p-process theorists [M. Arnould and S. Goriely, Phys. Rep. 384, 1 (2003)]. These nuclides are Mo92,94, Ru96,98, La138, and Ta180m. The absence of accurate abundances for these isotopes is due to the fact that the isotopic composition of the elements concerned have not been corrected for isotope fractionation induced by the thermal ionization mass spectrometric instruments used to measure them. To remedy this deficiency, a VG 354 mass spectrometer was calibrated using gravimetric mixtures of enriched isotopes to enable the absolute isotopic compositions of these elements to be obtained. Although the isotopic abundances of Mo92,94, La138, and Ta180m have previously been reported, the absolute abundances of Ru96,98 are reported for the first time in this article, with a significant reduction in the magnitude of the values as compared to existing abundances.
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