Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-21
Phys.Rev.Lett.95:031101,2005; Erratum-ibid.96:019902,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures. Accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.95.031101
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.
Aguer P.
Barhoumi S.
Chafa A.
Coc Alain
Garrido Fernando
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