The s-Process Branching at 185W
/ Authors
/ Abstract
The neutron capture cross section of the unstable nucleus 185W has been derived from experimental photoactivation data of the inverse reaction 186W(γ, n)185W. The new result of σ = 687 ± 110 mbarn confirms the theoretically predicted neutron capture cross section of 185W of σ ≈ 700 mbarn at kT = 30 keV. A neutron density in the classical s-process of nn = × 108 cm-3 is derived from the new data for the 185W branching. In a stellar s-process model, one finds a significant overproduction of the residual s-only nucleus 186Os.
Journal: The Astrophysical Journal
DOI: 10.1086/345086