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Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 25: Nuclear and Particle Astrophysics III

HK 25.4: Talk

Wednesday, March 13, 2002, 11:45–12:00, C

Alpha decay of low-lying states in 19Ne: studies toward a determination of the 15O(α,γ)19Ne reaction rate in novae and X-ray bursts — •B. Davids1, R. Siemssen1, A. M. van den Berg1, F. Fleurot1, M. Hunyadi1, M. de Huu1, R. E. Segel2, H. W. Wilschut1, and H. J. Wörtche11Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, the Netherlands — 2Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208 USA

The rate of the 15O(α,γ)19Ne reaction strongly influences breakout from the hot CNO cycles into the rp process in novae and X-ray bursts. As a direct measurement of the cross section for this reaction is not yet feasible, measurements of the reduced alpha widths of low-lying states in 19Ne using transfer reactions with stable beams offer the most reliable information on the resonant reaction rate. At the KVI, we have carried out a preliminary measurement of this kind using the highly selective p(21Ne,t)19Ne reaction. The principles of this technique and initial results will be presented.

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