1 citations · 2 across the 3 of their papers we have counts for
8 papers
Neutron-Capture Element Abundances in Halo Stars
John J. Cowan, Christopher Sneden
We present new abundance observations of neutron-capture elements in Galactic stars. These include new Hubble Space Telescope (HST) detections of the elements Ge, Zr and Pt in a gr…
Halo Star Abundances and Heavy Element Nucleosynthesis
John J. Cowan, Christopher Sneden
We present new Hubble Space Telescope (HST) abundance observations of the neutron-capture elements Ge, Zr, Os and Pt in a group of 11 Galactic halo stars, including the well studie…
Advances in r-Process Nucleosynthesis
John J. Cowan, Christopher Sneden
During the last several decades, there have been a number of advances in understanding the rapid neutron-capture process (i.e., the r-process). These advances include large quantit…
The r-Process and Chronometers
John J. Cowan, Christopher Sneden, James W. Truran
We present detailed abundance observations of the metal-poor ([Fe/H] = --2.0) Galactic halo star BD+17 3248. We have detected gold in this star, for the first time in any halo star…
Nucleosynthesis Clocks and the Age of the Galaxy
J. W. Truran, S. Burles, J. J. Cowan +1
Nucleocosmochronology involves the use of the abundances of radioactive nuclear species and their radiogenic decay daughters to establish the finite age of the elements and the tim…
The Age of the Galaxy from Thorium Cosmochronometry
C. Sneden, J. J. Cowan
The long-lived radioactive element thorium can potentially provide a simple and direct clock to determine the age of our Galaxy. Spectroscopic investigations of thorium in metal-po…