Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..78b5803h&link_type=abstract
Physical Review C, vol. 78, Issue 2, id. 025803
Physics
7
Transfer Reactions, Radiative Capture, Elastic And Inelastic Scattering, Hydrostatic Stellar Nucleosynthesis
Scientific paper
The 13C(α,n)16O reaction constitutes the dominant neutron source for the main s process, which operates at a thermal energy of kT=8 keV. Since the cross section at stellar energies is very small, the reaction rate cannot be directly determined and has to be extrapolated from cross section results obtained at higher energies. To remove various discrepancies in the normalization of previous data sets and to subsequently improve the reliability of the extrapolation, we performed measurements of the 13C(α,n)16O reaction in the energy range Ec.m.=320-700 keV. In addition, the double differential scattering cross section 13C(α,α)13C was measured in the energy range Elab=2.6-6.2 MeV for 28 angles. These data were used to constrain possible contributions from background resonances for a reliable extrapolation with the multichannel R-matrix code SAMMY. As a result, the uncertainties were significantly reduced, and a reaction rate of (4.6±1.0)×10-14 cm3/moles at kT=8 keV (T=0.1×109 K) was determined.
Azuma R. E.
Couture Aaron
Daly J.
Detwiler R.
Görres Joachim
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