p 20 02 The s - process branching at 185
نویسندگان
چکیده
The neutron capture cross section of the unstable nucleus W has been derived from experimental photoactivation data of the inverse reaction W(γ,n)W. The new result of σ = (687 ± 110)mbarn confirms the theoretically predicted neutron capture cross section of W of σ ≈ 700mbarn at kT = 30keV. A neutron density in the classical s-process of nn = (3.8 +0.9 −0.8) × 10 8 cm is derived from the new data for the W branching. In a stellar s-process model one finds a significant overproduction of the residual s-only nucleus Os. Subject headings: nuclear reactions, nucleosynthesis, abundances
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