Other
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvc..75c5810c&link_type=abstract
Physical Review C, vol. 75, Issue 3, id. 035810
Other
22
Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Resonance Reactions, Radiative Capture, 6<=A<=19
Scientific paper
The O17(p,α)N14 and O17(p,γ)F18 reactions are of major importance to hydrogen-burning nucleosynthesis in a number of different stellar sites. In particular, O17 and F18 nucleosynthesis in classical novae is strongly dependent on the thermonuclear rates of these two reactions. The previously estimated rate for O17(p,α)N14 carries very large uncertainties in the temperature range of classical novae (T=0.01 0.4 GK), whereas a recent measurement has reduced the uncertainty of the O17(p,γ)F18 rate. We report on the observation of a previously undiscovered resonance at Ec.m.=183.3 keV in the O17(p,α)N14 reaction, with a measured resonance strength ωγpα=(1.6±0.2)×10-3 eV. We studied in the same experiment the O17(p,γ)F18 reaction by an activation method, and the resonance strength was found to amount to ωγpγ=(2.2±0.4)×10-6 eV. The excitation energy of the corresponding level in F18 was determined to be 5789.8±0.3 keV in a Doppler shift attenuation method measurement, which yielded a value of τ<2.6 fs for the level lifetime. The O17(p,α)N14 and O17(p,γ)F18 reaction rates were calculated using the measured resonance properties and reconsidering some previous analyses of the contributions of other levels or processes. The O17(p,α)N14 rate is now well established below T=1.5 GK, with uncertainties reduced by orders of magnitude in the temperature range T=0.1 0.4 GK. The uncertainty in the O17(p,γ)F18 rate is somewhat larger because of remaining obscurities in the knowledge of the direct capture process. These new resonance properties have important consequences for O17 nucleosynthesis and γ-ray emission of classical novae.
Aguer P.
Barhoumi S.
Chafa A.
Coc Alain
de Séréville N.
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