Physics – Nuclear Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvc..71e5801f&link_type=abstract
Physical Review C, vol. 71, Issue 5, id. 055801
Physics
Nuclear Physics
21
Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Other Resonances, Radiative Capture, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments
Scientific paper
The 17O(p,γ)18F and 17O(p,α)14N reactions have a profound influence on hydrogen-burning nucleosynthesis in a number of stellar sites, including red giants, asymptotic giant branch (AGB) stars, massive stars, and classical novae. Previously evaluated thermonuclear rates for both reactions carry large uncertainties. We investigated the proton-capture reaction on 17O in the bombarding energy range of Elabp=180-540keV. We observed a previously undiscovered resonance at ElabR=193.2±0.9keV. The resonance strength amounts to (ωγ)pγ=(1.2±0.2)×10-6eV. With this value, the uncertainties of the 17O(p,γ)18F reaction rates are reduced by orders of magnitude in the peak temperature range of classical novae (T=0.1-0.4GK). We also report on a reevaluation of the 17O(p,γ)18F reaction rates at lower temperatures that are pertinent to red giants, AGB stars, or massive stars. The present work establishes the 17O(p,γ)18F reaction rates over a temperature range of T=0.01-1.5GK with statistical uncertainties of 10 50%. The new recommended reaction rates deviate from the previously accepted values by an order of magnitude around T≈0.2GK and by factors of 2 3 at T<0.1GK.
Champagne Arthur E.
Fitzgerald Ryan P.
Fox Camron
Iliadis Ch.
Longland Richard
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