Stellar neutron capture cross section of the unstable s-process branching point 151Sm

Details Stellar neutron capture cross section of the unstable s-process branching point 151Sm Stellar neutron capture cross section of the unstable s-process branching point 151Sm

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..73a5802w&link_type=abstract

Physical Review C, vol. 73, Issue 1, id. 015802

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8

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The neutron capture cross sections of the radioactive isotope 151Sm and of natural samarium have been measured in the energy range from 3 keV to 225 keV at the Karlsruhe 3.7 MV Van de Graaff accelerator. Neutrons were produced via the 7Li(p,n)7Be reaction by bombarding metallic Li targets with a pulsed proton beam and capture events were registered with the Karlsruhe 4π Barium Fluoride Detector. The cross sections were determined relative to the gold standard using a 206 mg sample of samarium oxide with 90% enrichment in 151Sm. Over most of the measured energy range uncertainties of ~2 3% could be achieved for the 151Sm/197Au ratio. Maxwellian averaged neutron capture cross sections of 151Sm were calculated for thermal energies between kT = 8 keV and 100 keV with due consideration of the stellar enhancement factor and were found to be systematically larger than all previous theoretical predictions used in the analysis of the s-process branching at 151Sm. In the context of the branching analysis, an experimental determination of the stellar enhancement factor due to captures in thermally excited states is proposed, and the tentative determination of the p-process residual of 152Gd and a few other cases is discussed.

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