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.
@article{arxiv.astro-ph/0506500,
title = {Hydrogen Burning of 17-O in Classical Novae},
author = {A. Chafa and V. Tatischeff and P. Aguer and S. Barhoumi and A. Coc and F. Garrido and M. Hernanz and J. Jose and J. Kiener and A. Lefebvre-Schuhl and S. Ouichaoui and N. de Sereville and J. -P. Thibaud},
journal= {arXiv preprint arXiv:astro-ph/0506500},
year = {2009}
}
Comments
4 pages, 4 figures. Accepted for publication in Physical Review Letters