Fast neutron capture on the Hf isotopes: Cross sections, isomer production, and stellar aspects

Details Fast neutron capture on the Hf isotopes: Cross sections, isomer production, and stellar aspects Fast neutron capture on the Hf isotopes: Cross sections, isomer production, and stellar aspects

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..73d5807w&link_type=abstract

Physical Review C, vol. 73, Issue 4, id. 045807

Physics

9

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

Scientific paper

The (n,γ) cross sections of Hf176, Hf177, Hf178, Hf179, and Hf180 have been measured in the energy range from 3 to 225 keV relative to the gold standard. Neutrons were produced via the Li7(p,n)Be7 reaction and capture events were registered with the Karlsruhe 4π barium fluoride detector. The overall uncertainties are between 0.9 and 2.6%, about 5 times smaller than in previous experiments. Partial cross sections to ground and isomeric states could be experimentally identified for neutron capture on Hf176,177,178,179, indicating a strong population of yet-unknown isomeric states in Hf177 and Hf180. This feature was confirmed by extensive GEANT simulations based on calculated capture cascades. The deduced Maxwellian-averaged (n,γ) cross sections for thermal energies between kT=8 and 100 keV contribute to the analysis of the s-process branchings at A=176 and A=179/180 and have significant consequences for the separation of the solar s- and r-process components.

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