Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 28: Nuclear Astrophysics

HK 28.1: Eingeladener Gruppenbericht

Dienstag, 17. März 2009, 14:00–14:30, H-ZO 60

Proton and alpha induced reactions relevant for the astrophysical p-process — •György Gyürky — Institute of Nuclear Research (ATOMKI), H-4001 Debrecen, POB.51., Hungary

The astrophysical p-process is the nucleosynthetic mechanism responsible for the production of the so called p-nuclei; the heavy, proton rich isotopes which are not produced by neutron capture reactions in the s- and r-processes. The modeling of the p-process requires the knowledge of the astrophysical site where the process takes place as well as the rates of the thousands of reactions involved in a p-process network. The limited accuracy of p-process models in calculating the p-isotope abundances can in part be attributed to the uncertainties in the reaction rates. These uncertainties are especially high for reactions involving charged particles. Therefore, the experimental investigation of charged particle induced reactions in the relevant mass and energy range is crucial in the development of more accurate p-process models. The measured cross sections can, on one hand, be directly used in the models, and, on the other hand, they can be used to test the statistical model calculations which are widely employed in p-process network calculations.

Recently, the cross section of several proton and alpha-induced reactions has been measured using the activation technique. Some details of the experiments and the results will be shown, the comparison with statistical model predictions and the implication to p-process network calculations will be discussed.