Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 34: Nuclear and Particle Astrophysics II
HK 34.1: Gruppenbericht
Mittwoch, 10. März 2004, 14:00–14:30, F
Nuclear Astrophysics with Real Photons — •K. Sonnabend1, M. Babilon1, W. Bayer1, D. Galaviz1, T. Hartmann1, A. Kretschmer1, S. Müller1, T. Rauscher2, D. Savran1, K. Vogt1, S. Volz1, and A. Zilges1 — 1Institut für Kernphysik, Technische Universität Darmstadt, D–64289 Darmstadt, Germany — 2Institut für Physik, Universität Basel, CH–4056 Basel, Switzerland
Photon-induced reactions – like (γ,n), (γ,p) or
(γ,α) – play the major role in p-process
nucleosynthesis. (γ,n) reaction rates are measured at the
S–DALINAC by simulating a quasi-stellar photon bath with variable
temperature [1,2]. Furthermore, the important neutron capture cross
sections of s-process branching points can be determined measuring
the (γ,n) cross section and using the detailed balance
assumption [3].
We report on the current status of our experiments using the
photoactivation technique, explain our different experimental
approaches and outline the analysis of the data for both applications
– p- and s-process nucleosynthesis.
* supported by the DFG (SFB 634 and Zi 510/2-2) and the
Swiss NSF (grants 2124-055832.98, 2000-061822.00, and 2024-067428.01).
[1] P. Mohr et al., Phys. Lett. B 488, 127 (2000).
[2] K. Vogt et al., Phys. Rev. C 63, 055802 (2001).
[3] K. Sonnabend et al., Astrophys. J. 583, 506 (2003).