Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Poster - Nukleare Astrophysik
HK 57.3: Poster
Mittwoch, 6. März 2013, 16:45–19:00, HSZ 4.OG
Activation measurements of α-induced reactions relevant for p-process nucleosynthesis — •Philipp Scholz, Janis Endres, Jan Mayer, Lars Netterdon, Anne Sauerwein, and Andreas Zilges — Institut für Kernphysik, Universität zu Köln
The production of p nuclei, those proton-rich nuclei that are not produced by neutron-capture reactions, is mainly attributed to sequences of photodisintegration reactions - the so called γ process.
Most of the predicted reaction rates for reaction network calculations for the γ process are derived from Hauser-Feshbach calculations which strongly depend on γ-strength functions, nuclear-level densities and adopted nuclear models for optical-model potentials. Experimental data for α-induced reactions at low energies are rare. Hence, the construction of a global optical potential and therefore reliable predictions of reaction rates are difficult.
For the improvement of the experimental situation the reactions 141Pr(α,n)144Pm, 168Yb(α,n)171Hf, and 168Yb(α,γ)172Hf were studied with the activation technique [1]. Additionally, an activation experiment for the reaction 187Re(α,n) was recently performed. The counting setup at the Institut für Kernphysik in Cologne as well as experimental results are presented.
Supported under the DFG contracts (ZI 510/5-1, INST 216/544-1). P.S, J.M. and A.S. are member of the Bonn-Cologne Graduate School of Physics and Astronomy.
[1] A. Sauerwein et al., Phys. Rev. C 84, 045808 (2011)