The 15O(alpha,gamma)19Ne* reaction using a 18Ne radioactive beam

Cherubini, S. and Galster, W. and Graulich, J.S. and Leleux, P. and Loiselet, M. and Musumarra, A. and Ninane, A. and Ryckewaert, G. and Vervier, J. and Aliotta, M. and Figuera, P. and Lattuada, M. and Pellegriti, M.G. and Spitaleri, C. and Davinson, T. and Di Pietro, A. and Laird, A.M. and Ostrowski, A.N. and Shotter, A.C. and Woods, P.J. and Hinnefeld, J. and Typel, S. and Wolter, H. (2001) The 15O(alpha,gamma)19Ne* reaction using a 18Ne radioactive beam. Nuclear Physics A, 688 (1-2). pp. 465-467. ISSN 0375-9474 (http://dx.doi.org/10.1016/S0375-9474(01)00757-6)

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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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