Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 25: Nuclear and Particle Astrophysics III

HK 25.4: Vortrag

Mittwoch, 13. März 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. Wörtche¹ — ¹Kernfysisch 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.