s-process branching at 185W revised
Mohr, P. · Shizuma, T. · Ueda, H. · Goko, S. · Makinaga, A. · Hara, K. Y. · Hayakawa, T. · Lui, Y. -W. · Ohgaki, H. · Utsunomiya, H.
Original · EN
The neutron capture cross section of the unstable s-process branching nucleus 185W has been derived from experimental data of the inverse 186W(g,n)185W photodisintegration taken with monochromatic photon beams from laser Compton scattering. The result of sigma = 553 +- 60 mb at kT = 30 keV leads to a relatively high effective neutron density in the classical s-process of Nₙ = 4.7 × 10⁸ cm-3. A realistic model for the s-process in thermally pulsing AGB stars overestimates the abundance of 186Os significantly because of the relatively small neutron capture cross section of 185W.
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