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Hydrogen Burning of 17-O in Classical Novae

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arxiv astro-ph/0506500 v1 pith:GUD4XJDS submitted 2005-06-21 astro-ph nucl-ex

A. Chafa , V. Tatischeff , P. Aguer , S. Barhoumi , A. Coc , F. Garrido , M. Hernanz , J. Jose
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J. Kiener A. Lefebvre-Schuhl S. Ouichaoui N. de Sereville J.-P. Thibaud
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keywords gammaalphaomegareactionresonanceclassicalgamma-raynovae
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We report on the observation of a previously unknown resonance at E=194.1+/-0.6 keV (lab) in the 17-O(p,alpha)14-N reaction, with a measured resonance strength omega_gamma(p,alpha)=1.6+/-0.2 meV. We studied in the same experiment the 17-O(p,gamma)18-F reaction by an activation method and the resonance-strength ratio was found to be omega_gamma(p,alpha)/omega_gamma(p,gamma)=470+/-50. The corresponding excitation energy in the 18-F compound nucleus was determined to be 5789.8+/-0.3 keV by gamma-ray measurements using the 14-N(alpha,gamma)18-F reaction. These new resonance properties have important consequences for 17-O nucleosynthesis and gamma-ray astronomy of classical novae.

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