α-decay branching ratios of near-threshold states in 19Ne and the astrophysical rate of 15O(α, γ)19Ne

B. Davids, A. M. Van den Berg, P. Dendooven, F. Fleurot, M. Hunyadi, M. A. De Huu, K. E. Rehm, R. E. Segel, R. H. Siemssen, H. W. Wilschut, H. J. Wörtche, A. H. Wuosmaa

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Abstract

The 15O(α, γ)19Ne reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in 19Ne lying just above the 15O+α threshold. We have measured the α-decay branching ratios for these states using the p(21Ne, t)19Ne reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via 15O(α, γ)19Ne, assuming that current models accurately represent their temperature and density conditions.

Original languageEnglish
Article number012801
Pages (from-to)128011-128014
Number of pages4
JournalPhysical Review C - Nuclear Physics
Volume67
Issue number1
Publication statusPublished - Jan 1 2003

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Davids, B., Van den Berg, A. M., Dendooven, P., Fleurot, F., Hunyadi, M., De Huu, M. A., Rehm, K. E., Segel, R. E., Siemssen, R. H., Wilschut, H. W., Wörtche, H. J., & Wuosmaa, A. H. (2003). α-decay branching ratios of near-threshold states in 19Ne and the astrophysical rate of 15O(α, γ)19Ne. Physical Review C - Nuclear Physics, 67(1), 128011-128014. [012801].