2008/09/16 by P. E. Koehler, P. Koehler, Koehler, P. E. +7
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Nuclear Physics and Applications #Nuclear physics research studies #Nuclear reactor physics and engineering #astro-ph
paper · pdf · doi:10.48550/arxiv.0809.2757
5 pages, 2 figures, to be published in the proceedings of the 10th Symposium on Nuclei in the Cosmos
arxiv created 2008/09/16 · openalex publication_date 2008/09/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Abundances of Mo isotopes predicted by stellar models of the s process are, except for 95Mo, in good agreement with data from single grains of mainstream presolar SiC. Because the meteorite data seemed sound and no reasonable modification to stellar theory resulted in good agreement for 95Mo, it has been suggested that the recommended neutron capture reaction rate for this nuclide is 30% too low. Therefore, we have made a new determination of the 95Mo(n,gamma) reaction rate via high-resolution measurements of the neutron-capture and total cross sections of 95Mo at the Oak Ridge Electron Linear Accelerator. These data were analyzed with the R-matrix code SAMMY to obtain parameters for resonances up to En = 10 keV. Also, a small change to our capture apparatus allowed us to employ a new technique to vastly improve resonance spin and parity assignments. These new resonance parameters, together with our data in the unresolved range, were used to calculate the 95Mo(n,gamma) reaction rate at s-process temperatures. We compare the currently recommended rate to our new results and discuss their astrophysical impact.