The s-process branchings at W-185 and Re-186

Details The s-process branchings at W-185 and Re-186 The s-process branchings at W-185 and Re-186

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..605k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 605-616.

Astronomy and Astrophysics

Astrophysics

26

Nuclear Astrophysics, Rhenium Isotopes, Stellar Models, Tungsten Isotopes, Abundance, Neutron Activation Analysis, Statistical Analysis

Scientific paper

The activation method is used to measure the stellar neutron capture rates of Re-185 and Re-187 at kT = 25 keV as 1677 + or - 65 and 1269 + or - 62 mbarn, respectively. The experimental setup and procedure are described, and the results are presented in tables and graphs. Also reported are calculations of the capture rates for the unstable isotopes, e.g., 597 + or - 85 mbarn for W-185 and 1775 + or - 265 mbarn for Re-186, again at kT = 25 keV. These results are then applied, using the classical method, to estimate the mean neutron density for the s-process nucleosynthesis branchings at W-185 and Re-186: n(n) = (4.1 + 1.2 or - 1.1) x 10 to the 8th/cu cm.

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