Indirect study of the astrophysically important 15O(α,γ)19Ne reaction through 2H(18Ne,19Ne)1H

Laird, A.M. and Cherubini, S. and Ostrowski, A.N. and Aliotta, M. and Davinson, T. and Di Pietro, A. and Figuera, P. and Groombridge, D. and Galster, W. and Graulich, J.S. and Hinnefeld, J. and Lattuada, M. and Leleux, P. and Michel, L. and Musumarra, A. and Ninane, A. and Pellegriti, M.G. and Shotter, A.C. and Spitaleri, A. and Tumino, A. and Vervier, J. and Woods, P. (2002) Indirect study of the astrophysically important 15O(α,γ)19Ne reaction through 2H(18Ne,19Ne)1H. Physical Review C: Nuclear Physics, 66 (4). pp. 1-4. 048801. ISSN 0556-2813

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Abstract

The 15O(α,γ)19Ne reaction is generally considered as a potential breakout reaction from the hot CNO cycle. Under nova conditions, the reaction rate is dominated by a single sub-Coulomb resonance at Ec.m.=504 keV which corresponds to a 19Ne excitation energy of ER=4.033 MeV. Results from a d(18Ne,19Ne)p experiment show that states of astrophysical interest are populated in this reaction. An upper limit for the α-branching ratio of the 4.033 MeV state was identified and branching ratios for other states in 19Ne were found to be in good agreement with stable beam based results.

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