Stellar (n,γ) cross sections of Hf174 and radioactive Hf182

Details Stellar (n,γ) cross sections of Hf174 and radioactive Hf182 Stellar (n,γ) cross sections of Hf174 and radioactive Hf182

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvc..75a5804v&link_type=abstract

Physical Review C, vol. 75, Issue 1, id. 015804

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9

Radiative Capture, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The stellar neutron capture cross sections of Hf174 and the radioactive isotope Hf182 (t1/2=8.9×106 yr) have been measured for the first time at kT=25 keV by means of the activation technique. These isotopes originate from different stellar scenarios, Hf174 from the p-process by a series of photodisintegration reactions of heavier seed nuclei, and Hf182 from the s-process in asymptotic giant branch stars as well as from the r-process in supernovae or neutron star mergers. Both activation measurements were carried out at the Karlsruhe Van de Graaff accelerator using the Li7(p,n)Be7 reaction for simulating a Maxwellian neutron spectrum corresponding to a thermal energy of kT=25 keV. The Maxwellian averaged cross sections (MACS) extrapolated to the common s-process temperatures at kT=30 keV yield <σ>30=983±46 and 141±8 mb for Hf174 and Hf182, respectively.

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