Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..77a5808h&link_type=abstract
Physical Review C, vol. 77, Issue 1, id. 015808
Physics
14
Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 39<=A<=58, 59<=A<=89
Scientific paper
Neutron capture nucleosynthesis in massive stars plays an important role in galactic chemical evolution as well as for the analysis of abundance patterns in very old metal-poor halo stars. The so-called weak s-process component, which is responsible for most of the s abundances between Fe and Sr, turned out to be very sensitive to the stellar neutron capture cross sections in this mass region and, in particular, of isotopes near the seed distribution around Fe. Activation measurements in a quasistellar neutron spectrum corresponding to a thermal energy of kT=25 keV have been carried out on Fe58, Co59, Ni64, Cu63, and Cu65. By a series of repeated irradiations with different experimental conditions, uncertainties between 3.0% and 4.6% could be achieved, factors of 2 to 3 more accurate than previous data. Compared to previous measurements, severe discrepancies were found for Cu63,65. The consequences of these results have been studied by detailed model calculations for convective core He burning and convective shell C burning in massive stars.
Gallino Roberto
Heil Matthias
Käppeler Franz
Pignatari Marco
Uberseder Ethan
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