Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of Os186,187,188

Details Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of Os186,187,188 Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of Os186,187,188

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvc..82a5804f&link_type=abstract

Physical Review C, vol. 82, Issue 1, id. 015804

Physics

7

Level Density, Radiative Capture, S-Process, 150<=A<=189

Scientific paper

Neutron resonance analyses have been performed for the capture cross sections of Os186, Os187, and Os188 measured at the n_TOF facility at cern. Resonance parameters have been extracted up to 5, 3, and 8 keV, respectively, using the sammy code for a full R-matrix fit of the capture yields. From these results average resonance parameters were derived by a statistical analysis to provide a comprehensive experimental basis for modeling of the stellar neutron capture rates of these isotopes in terms of the Hauser-Feshbach statistical model. Consistent calculations for the capture and inelastic reaction channels are crucial for the evaluation of stellar enhancement factors to correct the Maxwellian averaged cross sections obtained from experimental data for the effect of thermally populated excited states. These factors have been calculated for the full temperature range of current scenarios of s-process nucleosynthesis using the combined information of the experimental data in the region of resolved resonances and in the continuum. The consequences of this analysis for the s-process component of the Os187 abundance and the related impact on the evaluation of the time duration of galactic nucleosynthesis via the Re/Os cosmochronometer are discussed.

Affiliated with

Also associated with

No associations

Rating

Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of Os186,187,188 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of Os186,187,188, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of Os186,187,188 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1230889