Physics – Nuclear Physics – Nuclear Theory
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rpao.conf...99j&link_type=abstract
THE r-PROCESS The Astrophysical Origin of the Heavy Elements and Related Rare Isotope Accelerator Physics. Proceedings of the Fi
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
Observations of the abundance of neutron-capture elements in metal-poor stars provide a detailed look at the output of individual r-process events. Data currently show that the abundance ratios are similar between Ba and Yb in metal-poor stars and in the solar system r-process contributions. There is some variation in the Eu/Th ratio, but the current small samples need to be expanded before we understand the true scatter in the production of the heaviest nuclei. There is also a spread in the [Y/Ba] and a disagreement with the solar system r-process pattern in the Nb-Ag region, which argue of the presence of at least two r-process type of events, or perhaps a continuum of conditions in r-process sites. Intriguing information can be also be gleaned from the abundance ratios in stars that do not have detectable r-process elements in their atmospheres. Few stars have been found without heavy elements, but some of those have unusual abundance ratios in the lighter elements. We are beginning to go beyond the solar neighborhood to study the production of the r-process elements in regions with a very different history, such as the Bulge and globular clusters.
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