Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..77a5802c&link_type=abstract
Physical Review C, vol. 77, Issue 1, id. 015802
Physics
5
Radiative Capture, Resonance Reactions, Hydrostatic Stellar Nucleosynthesis, 20<=A<=38
Scientific paper
The F19(p,γ)Ne20 reaction represents the only breakout path for the carbon-nitrogen-oxygen cycle operating at temperatures below T=0.1 GK, an energy regime important for main-sequence hydrogen burning as well as hydrogen burning in asymptotic giant branch stars. Large experimental uncertainties exist due to unknown low energy direct and resonant reaction contributions that have been difficult to study because of the high γ-ray background from the F19(p,α2γ) reaction. A new detection technique has been developed at the University of Notre Dame to measure the F19(p,γ) and F19(p,αiγ) reactions over an energy range of Ec.m.=200-760 keV. The analysis was carried out in a Breit-Wigner framework. This allowed a new determination of the resonance parameters as well as a first measurement of the signs of the interference terms. Partial widths and resonance strengths are reported for the resonances in this region.
Azuma Ryuzo
Beard Mary
Couder Manoel
Couture Aaron
Görres Joachim
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