EuNPC2015

The majority of the neutron-deficient p nuclei, bypassed by the s and r process, is believed to be produced during the γ process. During this process, the nuclei are synthesized by a network of photodisintegration reactions and β decays. Reaction rates for the γ-process network are mainly predicted by statistical-model calculations as experimental data are scarce. To reduce the uncertainties in these calculations from the nuclear physics side, input parameters entering these calculations such as optical-model potentials and the γ-ray strength function must be constrained experimentally. In this talk, an overview of experiments aiming at these input parameters using complementary approaches will be given. A setup for in-beam experiments with high-purity germanium detectors utilizing the γ-ray detector array HORUS at the Institute for Nuclear Physics in Cologne will be presented. Total and partial cross sections of the proton-capture reaction 89Y(p,γ)90Zr will be discussed, allowing constraints on the γ-ray strength function in 90Zr [1]. The 112Sn(α,γ)116Te reaction will be presented, being the first successful in-beam α-capture experiment on a heavy nucleus to date [2]. Moreover, activation experiments using the Cologne Clover Counting setup to refine α+nucleus optical model potentials will be presented. The reactions 187Re(α,n) and 108Cd(α,n) will be exemplarily discussed. Supported by the ULDETIS project within the UoC Excellence Initiative institutional strategy and by the Deutsche Forschungsgemeinschaft under contract DFG (INST 216/544-1). [1] L. Netterdon et al., Phys. Lett. B, in press. [2] L. Netterdon et al., Phys. Rev. C 91, 035801 (2015).