Stellar neutron capture cross sections of 128,129,130Xe

Details Stellar neutron capture cross sections of 128,129,130Xe Stellar neutron capture cross sections of 128,129,130Xe

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvc..66f4603r&link_type=abstract

Physical Review C, vol. 66, Issue 6, id. 064603

Astronomy and Astrophysics

Astrophysics

20

Radiative Capture, 90<=A<=149, Hydrostatic Stellar Nucleosynthesis, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The (n,γ) cross sections of the important s-process nuclei 128Xe,129Xe, and 130Xe have been measured in the astrophysically relevant neutron energy range from 3 to 225 keV. Neutrons were produced via the 7Li(p,n)7Be reaction by bombarding metallic Li targets with the pulsed proton beam of the Karlsruhe 3.75 MV Van de Graaff accelerator. High pressure gas samples of isotopically enriched xenon were used in the experiment, and capture events were registered with the Karlsruhe 4π Barium Fluoride Detector. The cross sections were determined relative to the gold standard with overall uncertainties of 1.5-2.5 % over most of the investigated energy range. From these results Maxwellian averaged stellar (n,γ) cross sections with typical uncertainties of 2% were calculated for thermal energies between kT=8 keV and 100 keV. In contrast to previous theoretical estimates, which were known to exhibit uncertainties of 30-50 %, this work provides a reliable basis for quantitative astrophysical analyses and makes it possible to define the solar Xe abundance to 5.39+/-0.22 relative to 106 Si atoms.

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